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Anatomy Of Visual Hallucinations Of The Brain









Oregonleatherboy

Kink Alter Ego, Artist, Blogger, Lover and Photographer














Overlapping Sensory Perception and Multisensory Illusions


  Trippy psychedelic eyeball art

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Overlapping Sensory Perception and Multisensory Illusions

Oregonleatherballs 


The sense of taste

is a multi-modal sensory illusion

of smell

a distinct sense

that is dependent on

1/2 dude wearing leather blazer shirtless smoking cigar with mustache and huge nose "ol factory"

the related sense of smell.



The sense of taste

is primarily concerned with detecting the basic gustatory senses

of

sweet,

sour,

salty,

bitter,

and

umami (savory).


while the

sense of smell

is responsible for detecting

a much wider range of odors.

The two senses

work together to create what we

perceive as Flavor.



sight is an

illusionary sensual illusion

with tactile sense.


Sight is a distinct sense that allows us to perceive light and color.


2/2 word "Tactile" as leather wearing blank-eyed muscle dude gives a cigar smoke foot massages



while tactile senses

such as

touch and pressure

allow us to perceive

texture and shape.



The interaction between

taste and smell

influencing how

humans perceive different Flavors.

Word "Gustatory" with handsome man wearing leather blazer with mouth wide open

taste, as was mentioned two paragraphs prior taste has five specific palette notes: 

  • sweet,
  • sour,
  • salty,
  • bitter,
  • and
  • umami (savory).

These tastes are detected

by specialized cells

on the tongue

called taste buds.


smell, on the other hand,

refers to the detection of

odors in the air through

specialized cells

in the nose called olfactory receptors.


The interaction between

taste and smell

occurs when

odor molecules

from food or drink stimulate

the olfactory receptors

in the nose,

which then send signals

to the brain.

These neurochemicals

combine with

signals from the

taste buds

on the tongue

to create a

perception

of Flavor.



2/2 Hypnotized man with milky white eyeballs bound with black leather gloves over mouth


factors that can influence

how taste and smell

interact, including:



Concentration


The concentration of an odor can affect how it is perceived


For example, a low concentration

of an odor

may not be noticeable until it is combined with a particular taste.


Chemical structure


The chemical structure of an

odor molecule

can also affect its interaction with taste.


Some molecules may enhance certain tastes

while suppressing others.



1/2 Hypnotized man with milky white eyeballs bound with black leather gloves over mouth


Personal preference

individual preferences for certain tastes and smells can also influence how they interact.


For example, some people may find that certain smells enhance their enjoyment of a particular food or drink. Think strawberr8es and vhsmpagne


In addition to their interaction, taste and smell


For example:


Age

As we age, our ability to detect certain tastes and smells may decline. This can lead to changes in our perception of Flavor.



Genetics


Our genes can also influence our ability to detect certain tastes and smells.


Some people may be more sensitive to bitter flavors, for example,

while others may be less sensitive.



Health:


Certain health conditions,

drugs

or medications

can also affect

ability to detect

tastes and smell.


For example, some chemotherapy drugs can cause a loss of taste and smell.


1/2 leather Master hypnotizing with smoke with gloves over mouth of brainwashed sub



The interaction between

hearing and Vision

is a process

that involves

neural pathways

and

cognitive processes.


it is nifty humans have the ability to use both senses

to determine the location of a

sound source in space.


This ability, known as

sound localization,

relies on

the brain's ability

to integrate information

from both the

auditory

and

Visual systems.



Research has shown that there are several ways in which hearing and


2/2 leather Master hypnotizing with smoke with gloves over mouth of brainwashed sub


Vision interact to facilitate sound localization.

One of these ways is through the use of Visual cues to help determine the location of a sound source.


For example, by seeing a person talking,

Humans can use

Visual cues

such as

lip movements

and

head orientation

to help us determine

where their voice

is coming from.


Another way in which

hearing and Vision

interact is through the process of

auditoryVisual integration.


This process involves

combining information from

both senses

to create a

more accurate

representation

of the environment.


For example, when we hear a sound,

our brain

automatically searches

for Visual cues

that may be associated

with that sound,

such as

movement

or

changes in light.


1/2 Leather gloves hand covering hypnotized dudes face


neural correlates

that have been identified in relation to sound localization

and

auditory-Visual integration.


The superior colliculus,

a structure located in

the midbrain

that plays an important role

in integrating

sensory information

from different modalities.


the primary auditory cortex

and

the Visual cortex,

which are responsible

for processing

auditory

and

Visual

information respectively.


Leather gloves hand covering hypnotized dudes face



being able to hear

something and tell how far away it is,

this ability is known as

distance perception.


Distance perception

relies on several cues,

changes in

volume,

pitch,

and timbre

also differencesiin arrival

time

and

intensity

between the ears.


These cues are processed

by the brain to create an internal representation of distance.



sound localization, cross-modal perception, taste–smell illusions, tactile inference, and imagery-driven sensory integration.

Scientific Facts About Overlapping Sensory Perception and Multisensory illusions


Auditory spatial perception

(pitch, timbre, time, vibration,volume )


sound localization

depends on

time differences

between ears.


Humans detect a sound’s direction

partly through

interaural time differences (ITD)

—tiny differences in arrival time at each ear,

sometimes as small as microseconds.


https://pmc.ncbi.nlm.nih.gov/articles/PMC11267622/ (PMC)

Abstract

Auditory localization is a fundamental ability that allows to perceive the spatial location of a sound source in the environment. The present work aims to provide a comprehensive overview of the mechanisms and acoustic cues used by the human perceptual system to achieve such accurate auditory localization. Acoustic cues are derived from the physical properties of sound waves, and many factors allow and influence auditory localization abilities. This review presents the monaural and binaural perceptual mechanisms involved in auditory localization in the three dimensions. Besides the main mechanisms of Interaural Time Difference, Interaural Level Difference and Head Related Transfer Function, secondary important elements such as reverberation and motion, are also analyzed. For each mechanism, the perceptual limits of localization abilities are presented. A section is specifically devoted to reference systems in space, and to the pointing methods used in experimental research. Finally, some cases of misperception and auditory illusion are described. More than a simple description of the perceptual mechanisms underlying localization, this paper is intended to provide also practical information available for experiments and work in the auditory field.


Keywords: acoustics, auditory localization, ITD, ILD, HRTF, action perception coupling






Loudness changes

create illusions of

distance or movement.


increasing volume

is often perceived

as an approaching sound,

while

decreasing volume is

interpreted as a receding source

—even if the sound is stationary.


https://pmc.ncbi.nlm.nih.gov/articles/PMC11267622/ (PMC)

Abstract

Auditory localization is a fundamental ability that allows to perceive the spatial location of a sound source in the environment. The present work aims to provide a comprehensive overview of the mechanisms and acoustic cues used by the human perceptual system to achieve such accurate auditory localization. Acoustic cues are derived from the physical properties of sound waves, and many factors allow and influence auditory localization abilities. This review presents the monaural and binaural perceptual mechanisms involved in auditory localization in the three dimensions. Besides the main mechanisms of Interaural Time Difference, Interaural Level Difference and Head Related Transfer Function, secondary important elements such as reverberation and motion, are also analyzed. For each mechanism, the perceptual limits of localization abilities are presented. A section is specifically devoted to reference systems in space, and to the pointing methods used in experimental research. Finally, some cases of misperception and auditory illusion are described. More than a simple description of the perceptual mechanisms underlying localization, this paper is intended to provide also practical information available for experiments and work in the auditory field.


Keywords: acoustics, auditory localization, ITD, ILD, HRTF, action perception coupling



timbre provides

spatial and environmental

cues about sound sources.


The spectral structure of

sound timbre allows

listeners to infer properties

of the environment or object

producing the sound.


https://www.ncbi.nlm.nih.gov/books/NBK92846/ (NCBI)


INTRODUCTION


We spend a large amount of our time communicating with other people. Much of this communication occurs face to face, where the availability of sensory input from several modalities (e.g., auditory, visual, tactile, olfactory) ensures a robust perception of information (e.g., Sumby and Pollack 1954; Gick and Derrick 2009). Robustness, in this case, means that the perception of a communication signal is veridical even when parts of the signal are noisy or occluded (Ay et al. 2007). For example, if the auditory speech signal is noisy, then the concurrent availability of visual speech signals (e.g., lip movements and gestures) improves the perception of the speech information (Sumby and Pollack 1954; Ross et al. 2007). The robustness in face-to-face communication does not only pertain to speech recognition (Sumby and Pollack 1954; Ross et al. 2007), but also to other information relevant for successful human interaction, for example, recognition of gender (Smith et al. 2007), emotion (de Gelder and Vroomen 1995; Massaro and Egan 1996), or identity (Schweinberger et al. 2007).


1/2 word "Touch" as leather wearing blank-eyed muscle dude gives a cigar smoke foot massages

pitch,

loudness,

and timbre

together enable

human echolocation.


Research shows people

—especially blind individuals

—can estimate object distance using

pitch strength,

loudness,

and

spectral cues

reflected from objects.


https://arxiv.org/abs/1801.09900 (arXiv)


Abstract

Investigated, by using auditory models, how three perceptual parameters, loudness, pitch and sharpness, determine human echolocation. We used acoustic recordings from two previous studies, both from stationary situations, and their resulting perceptual data as input to our analysis. An initial analysis was on the room acoustics of the recordings. The parameters of interest were sound pressure level, autocorrelation and spectral centroid. The auditory models were used to analyze echolocation resulting from the perceptual variables, i.e. loudness, pitch and sharpness. Relevant auditory models were chosen to simulate each variable. Based on these results, we calculated psychophysical thresholds for detecting a reflecting object with constant physical size. A non-parametric method was used to determine thresholds for distance, loudness, pitch and sharpness. Difference thresholds were calculated for the psychophysical variables, since a 2-Alternative-Forced-Choice Paradigm had originally been used. We found that (1) blind persons could detect objects at lower loudness values, lower pitch strength, different sharpness values and at further distances than sighted persons, (2) detection thresholds based on repetition pitch, loudness and sharpness varied and depended on room acoustics and type of sound stimuli, (3) repetition pitch was useful for detection at shorter distances and was determined from the peaks in the temporal profile of the autocorrelation function, (4) loudness at shorter distances provides echolocation information, (5) at longer distances, timbre aspects, such as sharpness, might be used to detect objects. We also discuss binaural information, movements and the auditory model approach. Autocorrelation was assumed as a proper measure for pitch, but the question is raised whether a mechanism based on strobe integration is a viable possibility.



The Deutsch octave illusion

alters perceived pitch location.


When alternating

high and low tones

are played in opposite ears,

listeners perceive a single tone that switches ears, even though both tones are always present.


https://pmc.ncbi.nlm.nih.gov/articles/PMC11267622/ (PMC)

Abstract

Auditory localization is a fundamental ability that allows to perceive the spatial location of a sound source in the environment. The present work aims to provide a comprehensive overview of the mechanisms and acoustic cues used by the human perceptual system to achieve such accurate auditory localization. Acoustic cues are derived from the physical properties of sound waves, and many factors allow and influence auditory localization abilities. This review presents the monaural and binaural perceptual mechanisms involved in auditory localization in the three dimensions. Besides the main mechanisms of Interaural Time Difference, Interaural Level Difference and Head Related Transfer Function, secondary important elements such as reverberation and motion, are also analyzed. For each mechanism, the perceptual limits of localization abilities are presented. A section is specifically devoted to reference systems in space, and to the pointing methods used in experimental research. Finally, some cases of misperception and auditory illusion are described. More than a simple description of the perceptual mechanisms underlying localization, this paper is intended to provide also practical information available for experiments and work in the auditory field.


Keywords: acoustics, auditory localization, ITD, ILD, HRTF, action perception coupling



Vision can bias

where we think a sound originates.


In the ventriloquism effect,

Visual cues shift the

perceived location of a sound

toward the seen object.


https://content.one.lumenlearning.com/introductiontopsychology/chapter/learn-it-crossmodal-phenomena/ (content.one.lumenlearning.com)






AudioVisual and multisensory illusions


The McGurk effect shows that

Vision alters what speech we hear.


Watching mouth movements

can change which

phoneme listeners

believe they hear.


https://www.sciencedirect.com/science/article/pii/S0960982200007405 (ScienceDirect)

Abstract


Recent research on multisensory perception suggests a number of general principles for crossmodal integration and that the standard model in the field — feedforward convergence of information — must be modified to include a role for feedback projections from multimodal to unimodal brain areas.



Imagined sounds

can alter visual perception.


Experiments show that

imagining a collision sound

increases the

probability of perceiving

objects Visually

“bounce” rather than pass through each other.


https://www.nature.com/articles/srep40123 (Nature)

Abstract


Can what we imagine hearing change what we see? Whether imagined sensory stimuli are integrated with external sensory stimuli to shape our perception of the world has only recently begun to come under scrutiny. Here, we made use of the cross-bounce illusion in which an auditory stimulus presented at the moment two passing objects meet promotes the perception that the objects bounce off rather than cross by one another to examine whether the content of imagined sound changes visual motion perception in a manner that is consistent with multisensory integration. The results from this study revealed that auditory imagery of a sound with acoustic properties typical of a collision (i.e., damped sound) promoted the bounce-percept, but auditory imagery of the same sound played backwards (i.e., ramped sound) did not. Moreover, the vividness of the participants’ auditory imagery predicted the strength of this imagery-induced illusion. In a separate experiment, we ruled out the possibility that changes in attention (i.e., sensitivity index d′) or response bias (response bias index c) were sufficient to explain this effect. Together, these findings suggest that this imagery-induced multisensory illusion reflects the successful integration of real and imagined cross-modal sensory stimuli, and more generally, that what we imagine hearing can change what we see.



Current Biology Volume 23, Issue 14, 22 July 2013, Pages 1367-1372

Mental Imagery Changes Multisensory Perception


Author links open overlay panel

Christopher C. Berger , H. Henrik Ehrsson 1

Mental imagery

can produce

multisensory illusions

similar to real stimuli.


Imagined sensory signals

can integrate with real stimuli

across modalities

(e.g., imagined sound

altering

Visual perception).


https://www.sciencedirect.com/science/article/pii/S0960982213007033 (ScienceDirect)

summary


Multisensory interactions are the norm in perception, and an abundance of research on the interaction and integration of the senses has demonstrated the importance of combining sensory information from different modalities on our perception of the external world [1, 2, 3, 4, 5, 6, 7, 8, 9]. However, although research on mental imagery has revealed a great deal of functional and neuroanatomical overlap between imagery and perception, this line of research has primarily focused on similarities within a particular modality [10, 11, 12, 13, 14, 15, 16] and has yet to address whether imagery is capable of leading to multisensory integration. Here, we devised novel versions of classic multisensory paradigms to systematically examine whether imagery is capable of integrating with perceptual stimuli to induce multisensory illusions. We found that imagining an auditory stimulus at the moment two moving objects met promoted an illusory bounce percept, as in the classic cross-bounce illusion; an imagined visual stimulus led to the translocation of sound toward the imagined stimulus, as in the classic ventriloquist illusion; and auditory imagery of speech stimuli led to a promotion of an illusory speech percept in a modified version of the McGurk illusion. Our findings provide support for perceptually based theories of imagery and suggest that neuronal signals produced by imagined stimuli can integrate with signals generated by real stimuli of a different sensory modality to create robust multisensory percepts. These findings advance our understanding of the relationship between imagery and perception and provide new opportunities for investigating how the brain distinguishes between endogenous and exogenous sensory events.


Cross-modal interactions

can occur without

conscious awareness.


Experiments show unseen images

can still bias perceived sound location

through audioVisual integration.


https://www.nature.com/articles/s41598-021-90183-w (Nature)

Abstract


Information integration is considered a hallmark of human consciousness. Recent research has challenged this tenet by showing multisensory interactions in the absence of awareness. This psychophysics study assessed the impact of spatial and semantic correspondences on audiovisual binding in the presence and absence of visual awareness by combining forward–backward masking with spatial ventriloquism. Observers were presented with object pictures and synchronous sounds that were spatially and/or semantically congruent or incongruent. On each trial observers located the sound, identified the picture and rated the picture’s visibility. We observed a robust ventriloquist effect for subjectively visible and invisible pictures indicating that pictures that evade our perceptual awareness influence where we perceive sounds. Critically, semantic congruency enhanced these visual biases on perceived sound location only when the picture entered observers’ awareness. Our results demonstrate that cross-modal influences operating from vision to audition and vice versa are interactively controlled by spatial and semantic congruency in the presence of awareness. However, when visual processing is disrupted by masking procedures audiovisual interactions no longer depend on semantic correspondences.




Perspectives from fMRI and Electrophysiology

Christoph Kayser, Christopher I. Petkov, Ryan Remedios, and Nikos K. Logothetis.

Early sensory brain areas

integrate multiple senses.


Neuroscience research shows

sensory modalities interact even in

early cortical processing stages,

not only in higher cognition.


https://www.ncbi.nlm.nih.gov/books/NBK92843/ (NCBI)

6.1. INTRODUCTION

Traditionally, perception has been described as a modular function, with the different sensory modalities operating as independent and separated processes. Following this view, sensory integration supposedly occurs only after sufficient unisensory processing and only in higher association cortices (Jones and Powell 1970; Ghazanfar and Schroeder 2006). Studies in the past decade, however, promote a different view, and demonstrate that the different modalities interact at early stages of processing (Kayser and Logothetis 2007; Schroeder and Foxe 2005; Foxe and Schroeder 2005). A good model for this early integration hypothesis has been the auditory cortex, where multisensory influences from vision and touch have been reported using a number of methods and experimental paradigms (Kayser et al. 2009c; Schroeder et al. 2003; Foxe and Schroeder 2005). In fact, anatomical afferents are available to provide information about nonacoustic stimuli (Rockland and Ojima 2003; Cappe and Barone 2005; Falchier et al. 2002) and neuronal responses showing cross-modal influences have been described in detail (Lakatos et al. 2007; Kayser et al. 2008, 2009a; Bizley et al. 2006). These novel insights, together with the traditional notion that multisensory processes are more prominent in higher association regions, suggest that sensory integration is a rather distributed process that emerges over several stages. Of particular interest in the context of sensory integration are stimuli with particular behavioral significance, such as sights and sounds related to communication (Campanella and Belin 2007; Petrini et al. 2009; Ghazanfar and Logothetis 2003; von Kriegstein and Giraud 2006; von Kriegstein et al. 2006).



taste–smell

interaction

(Flavor illusions)


Flavor perception

is primarily a

multisensory construct.


Flavor emerges from

integration of

taste,

smell,

somatosensory input,

vision,

and oddly enough sound.


https://pubmed.ncbi.nlm.nih.gov/25815982/ (PubMed)

Abstract


 perception of flavor is perhaps the most multisensory of our everyday experiences. The latest research by psychologists and cognitive neuroscientists increasingly reveals the complex multisensory interactions that give rise to the flavor experiences we all know and love, demonstrating how they rely on the integration of cues from all of the human senses. This Perspective explores the contributions of distinct senses to our perception of food and the growing realization that the same rules of multisensory integration that have been thoroughly explored in interactions between audition, vision, and touch may also explain the combination of the (admittedly harder to study) flavor senses. Academic advances are now spilling out into the real world, with chefs and food industry increasingly taking the latest scientific findings on board in their food design.


Consciousness and Cognition

Volume 17, Issue 3, September 2008, Pages 1016-1031

Consciousness and Cognition

Review

The multisensory perception of flavor

panelMalika Auvray, Charles Spence

Most “taste” sensations

actually originate from smell.


Volatile odor molecules

reach olfactory receptors

through the retronasal pathway

while chewing,

contributing heavily

to flavor perceptions.


https://www.sciencedirect.com/science/article/pii/S1053810007000657 (ScienceDirect)

Abstract


Following on from ecological theories of perception, such as the one proposed by [Gibson, J. J. (1966). The senses considered as perceptual systems. Boston: Houghton Mifflin] this paper reviews the literature on the multisensory interactions underlying the perception of flavor in order to determine the extent to which it is really appropriate to consider flavor perception as a distinct perceptual system. We propose that the multisensory perception of flavor may be indicative of the fact that the taxonomy currently used to define our senses is simply not appropriate. According to the view outlined here, the act of eating allows the different qualities of foodstuffs to be combined into unified percepts; and flavor can be used as a term to describe the combination of tastes, smells, trigeminal, and tactile sensations as well as the visual and auditory cues, that we perceive when tasting food.


Robin Fondberg a

, Johan N. Lundström a b c, Maria Blöchl d

, Mats J. Olsson a, Janina Seubert a e

odors are often

mislocalized to the mouth.


This phenomenon

—called odor referral

—causes smell

to be perceived as if they

originate from the mouth

rather than the nose.


https://www.sciencedirect.com/science/article/abs/pii/S0195666317314642 (ScienceDirect)

Abstract


Our hedonic response to a food is determined by its flavor, an inherently multisensory experience that extends beyond the mere addition of its odor and taste. While congruency is known to be important for multisensory processes in general, little is known about its specific role in flavor processing. The aim of the present study was to delineate the effects of odor-taste congruency on two central aspects of flavor: odor referral (or mislocalization) to the mouth, and pleasantness. We further aimed to test whether an eventual effect on pleasantness was mediated by odor referral. Aqueous solutions containing odors and tastes were prepared to create food-like stimuli with varying degrees of congruency, ranging from maximally incongruent to maximally congruent in nine steps. Thirty participants reported where they perceived the odors, and how much they liked the solutions. Congruency had a positive linear effect both on odor referral to the oral cavity and on pleasantness. However, the effect of congruency on pleasantness was not mediated by odor referral. These results indicate that as an odor-taste mixture approximates a mental representation of a familiar food, its components are increasingly merged into one perceptual object sensed in the mouth. In parallel, the mixture is evaluated as increasingly pleasant, which promotes consumption of familiar foods that have been determined through experience to be non-toxic. While the modulatory role of congruency on pleasantness and odor referral was confirmed, our results also indicate that these effects arise through distinct perceptual mechanisms.



2/2 Word "Taste" with handsome man wearing leather blazer with mouth wide open




1/2 dude wearing leather blazer shirtless smoking cigar with mustache and huge nose "Smell"

Robin Fondberg a

, Johan N. Lundström a b c,

Maria Blöchl d

, Mats J. Olsson a,

Janina Seubert a e

taste and smell

merge into a single perceptual object.


When odor and taste signals

are congruent with a familiar food,

the brain fuses them

into a unified flavor experience.


https://www.sciencedirect.com/science/article/abs/pii/S0195666317314642 (ScienceDirect)

Abstract


Our hedonic response to a food is determined by its flavor, an inherently multisensory experience that extends beyond the mere addition of its odor and taste. While congruency is known to be important for multisensory processes in general, little is known about its specific role in flavor processing. The aim of the present study was to delineate the effects of odor-taste congruency on two central aspects of flavor: odor referral (or mislocalization) to the mouth, and pleasantness. We further aimed to test whether an eventual effect on pleasantness was mediated by odor referral. Aqueous solutions containing odors and tastes were prepared to create food-like stimuli with varying degrees of congruency, ranging from maximally incongruent to maximally congruent in nine steps. Thirty participants reported where they perceived the odors, and how much they liked the solutions. Congruency had a positive linear effect both on odor referral to the oral cavity and on pleasantness. However, the effect of congruency on pleasantness was not mediated by odor referral. These results indicate that as an odor-taste mixture approximates a mental representation of a familiar food, its components are increasingly merged into one perceptual object sensed in the mouth. In parallel, the mixture is evaluated as increasingly pleasant, which promotes consumption of familiar foods that have been determined through experience to be non-toxic. While the modulatory role of congruency on pleasantness and odor referral was confirmed, our results also indicate that these effects arise through distinct perceptual mechanisms.



Blocking the nose

drastically reduces

flavor perception.


Most flavor information

comes from smell,

nasal blockage

can make foods

taste nearly identical.


https://www.sciencedirect.com/science/article/pii/S1053810007000657 (ScienceDirect)

Abstract


Following on from ecological theories of perception, such as the one proposed by [Gibson, J. J. (1966). The senses considered as perceptual systems. Boston: Houghton Mifflin] this paper reviews the literature on the multisensory interactions underlying the perception of flavor in order to determine the extent to which it is really appropriate to consider flavor perception as a distinct perceptual system. We propose that the multisensory perception of flavor may be indicative of the fact that the taxonomy currently used to define our senses is simply not appropriate. According to the view outlined here, the act of eating allows the different qualities of foodstuffs to be combined into unified percepts; and flavor can be used as a term to describe the combination of tastes, smells, trigeminal, and tactile sensations as well as the visual and auditory cues, that we perceive when tasting food.



Cross-modal correspondences and sensory inference


High-pitched sounds

are commonly associated with

higher visual positions.


Psychophysical studies

show consistent mappings between

pitch and Visual

elevation across people.


https://www.nature.com/articles/s41598-022-25614-3 (Nature)

Abstract


Cross-modal correspondences refer to associations between feature dimensions of stimuli across sensory modalities. Research has indicated that correspondence between audiovisual stimuli influences whether these stimuli are integrated or segregated. On the other hand, the audiovisual integration process plastically changes to compensate for continuously observed spatiotemporal conflicts between sensory modalities. If and how cross-modal correspondence modulates the “recalibration” of integration is unclear. We investigated whether cross-modal correspondence between auditory pitch and visual elevation affected audiovisual temporal recalibration. Participants judged the simultaneity of a pair of audiovisual stimuli after an adaptation phase in which alternating auditory and visual stimuli equally spaced in time were presented. In the adaptation phase, auditory pitch and visual elevation were manipulated to fix the order within each pairing of audiovisual stimuli congruent with pitch-elevation correspondence (visual leading or auditory leading). We found a shift in the point of subjective simultaneity (PSS) between congruent audiovisual stimuli as a function of the adaptation conditions (Experiment 1, 2), but this shift in the PSS was not observed within incongruent pairs (Experiment 2). These results indicate that asynchronies between audiovisual signals congruent with cross-modal correspondence are selectively recalibrated.



Auditory qualities

correspond to

visual textures and shapes.


Research shows

rough sounds

correspond to rough

Visual textures and

high-frequency sounds

correspond to sharper shapes.



https://journals.sagepub.com/doi/10.1177/2059204319846617 (Sage Journals)

Abstract

Many adjectives for musical timbre reflect cross-modal correspondence, particularly with vision and touch (e.g., “dark–bright,” “smooth–rough”). Although multisensory integration between visual/tactile processing and hearing has been demonstrated for pitch and loudness, timbre is not well understood as a locus of cross-modal mappings. Are people consistent in these semantic associations? Do cross-modal terms reflect dimensional interactions in timbre processing? Here I designed two experiments to investigate crosstalk between timbre semantics and perception through the use of Stroop-type speeded classification. Experiment 1 found that incongruent pairings of instrument timbres and written names caused significant Stroop-type interference relative to congruent pairs, indicating bidirectional crosstalk between semantic and auditory modalities. Pre-Experiment 2 asked participants to rate natural and synthesized timbres on semantic differential scales capturing luminance (brightness) and texture (roughness) associations, finding substantial consistency for a number of timbres. Acoustic correlates of these associations were also assessed, indicating an important role for high-frequency energy in the intensity of cross-modal ratings. Experiment 2 used timbre adjectives and sound stimuli validated in the previous experiment in two variants of a semantic-auditory Stroop-type task. Results of linear mixed-effects modeling of reaction time and accuracy showed slight interference in semantic processing when adjectives were paired with cross-modally incongruent instrument timbres (e.g., the word “smooth” with a “rough” timbre). Taken together, I conclude by suggesting that semantic crosstalk in timbre processing may be partially automatic and could reflect weak synesthetic congruency between interconnected sensory domains



Touch can evoke

object recognition

1/2 cigar smoking leather blazer wearing hypno bear using hypnosmoke to put muscular hottie on tranc

without vision.


Through haptic perception,

the brain reconstructs object identity

(material, shape, texture)

from tactile cues alone.


https://www.sciencedirect.com/science/article/pii/S0960982200007405 (ScienceDirect)

Abstract


Recent research on multisensory perception suggests a number of general principles for cross-modal integration and that the standard model in the field — feedforward convergence of information — must be modified to include a role for feedback projections from multimodal to unimodal brain areas.



2/2 cigar smoking leather blazer wearing hypno bear using hypnosmoke to put muscular hottie on tranc


John Driver and Charles SpenceMultisensory perception

is the brain’s

default processing mode.


The brain continuously integrates

signals across modalities

to create a

single coherent
representation

of the environment.



https://www.sciencedirect.com/science/article/pii/S0960982200007405 (ScienceDirect)


Abstract


While research from the 1960s through to the 1980s was largely concerned with identifying separate modules in the mind/brain, there is an increasing realization [3], [4], [5], [6] that understanding the interplay between components in an extended network is as important as fractionating that network into its component parts. Crossmodal integration is a paradigm case of the need to move beyond modularity in this way. There is also a growing awareness [4], [5], [6], [7] that principles of crossmodal integration uncovered within one domain, such as speech perception may extend to many other domains, such as stimulus localization, and therefore reflect general architectural constraints. Several recent studies [8], [9], [10] now suggest that models of crossmodal integration must move beyond the notion of purely feedforward convergence between separate information sources, which has long been the dominant assumption in the field. Finally, the new methods of cognitive neuroscience, such as functional imaging, seem ideally suited for studying crossmodal integration [8], [10], [11], [12] and have shed new light on fundamental issues.


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Human perception is not modular

—the brain continuously blends sensory inputs into unified experiences.

This blending allows efficient interpretation of the world but also produces systematic perceptual illusions where one sense modifies another.



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The anatomy of visual hallucinations of the brain


25 Causes / Contexts of Visual Hallucinations


Overlapping Sensory Perception and Multisensory Illusions

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