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Key TakeawaysThe McGurk effect occurs when a person perceives that another’s lip movements do not correspond to what that individual is saying.The McGurk effect occurs when an individual perceives a mismatch between the auditory speech sounds they hear and the visual movements they see while someone is speaking. This can lead to the perception that the person’s lip movements do not align with the spoken words, resulting in a perceptual illusion.Cognitive psychologists Harry McGurk, and John MacDonald, introduced the concept of the McGurk Effect in 1976 after accidentally discovering the phenomenon during an experiment.External factors such as visual distraction, tactile diversion, familiarity, and syllable structure can impact the McGurk effect.Brain damage, Alzheimer’s disease, Specific Language Impairment, and aphasia are some internal factors influencing the phenomenon.The magnitude of the McGurk effect may vary across languages; however, such variation vanishes when the audio stimuli become unintelligible.
Key Takeaways
The McGurk effect occurs when a person perceives that another’s lip movements do not correspond to what that individual is saying.The McGurk effect occurs when an individual perceives a mismatch between the auditory speech sounds they hear and the visual movements they see while someone is speaking. This can lead to the perception that the person’s lip movements do not align with the spoken words, resulting in a perceptual illusion.Cognitive psychologists Harry McGurk, and John MacDonald, introduced the concept of the McGurk Effect in 1976 after accidentally discovering the phenomenon during an experiment.External factors such as visual distraction, tactile diversion, familiarity, and syllable structure can impact the McGurk effect.Brain damage, Alzheimer’s disease, Specific Language Impairment, and aphasia are some internal factors influencing the phenomenon.The magnitude of the McGurk effect may vary across languages; however, such variation vanishes when the audio stimuli become unintelligible.
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The McGurk effect is aperceptual phenomenonwhich happens when a person perceives that the movement of another individual’s lips do not match up with what that individual is actually saying. (Boersma, 2011; Nath & Beauchamp, 2012)
In other words, an illusion occurs in the interaction between vision and hearing in the perception of speech.
Herein, one sound’s optical component is coupled with another sound’s audial component. This pairing subsequently induces the perception of a third sound.
While a combination of poor auditory stimuli and high-quality ocular information may constitute a common source of the McGurk effect, a multiplicity of factors influence the magnitude of this phenomenon.
Origin and History
During the study, they would, in one location, play the video of a mother speaking and, in another, the sound of her voice.
In the experiment, they directed a technician to dub, with the auditory syllable “ba,” a videotape with a visual of “ga.” When the dubbed tape was played, MacDonald and McGurk perceived “da”—a phoneme distinct from the dubbed audio and the visual.
External Factors Impacting the McGurk Effect
Visual Distraction
A study of the role of optic attention in audiovisual speech perception observed the McGurk effect in two different situations (Tiippana, Andersen & Sams, 2004).
The results demonstrated that the McGurk effect was weaker in the latter scenario. This outcome was attributed to visual attention’s modulation of audiovisual speech perception.
The modulation herein could have transpired either at a premature, unisensory state of processing or on account of alterations at the integration stage of visual and auditory information.
Tactile Diversion
Research has recently challenged the popular assumption that audiovisual pairing transpires in an attention-free mode (Alsius, Navarra & Soto-Faraco, 2007).
The McGurk effect was measured in a dual-task model involving an exacting tactile assignment. The results indicated that the proportion of visually swayed responses to audiovisual information abated as attention was deflected to the tactile task.
These findings provide a glimpse of the dynamism and the extensiveness of the interactions between crossmodal binding mechanisms and the attentional system.
Familiarity
An experiment examined the claims for the independence of facial speech processing and facial identity (Walker, Bruce & O’Malley, 1995).
In the study, the faces used to create the McGurk effect stimuli were manipulated so that they were alien to some participants but familiar to others. Moreover, the voices and the faces utilized were either congruent (belonged to the same individual) or incongruent (belonged to different individuals).
The distinct participant groups were compared to each other to gauge their susceptibility to the McGurk illusion. The results indicated that when the voices and the faces were incongruent, the participants who were acquainted with the faces were less susceptible than those who were unacquainted with the faces.
Syllable Structure
One research study conducted four experiments to decide whether optic information influences the judgments of acoustically-specified nonspeech events and speech events (Brancazio, Best & Fowler, 2006).
The results demonstrated a significant McGurk effect for isolated clicks. This effect, however, was notably smaller than that for the stop-consonant-vowel syllables.
Moreover, strong McGurk effects were discovered for click-vowel syllables, which were similar to those for English syllables.
On the other hand, weak McGurk effects were found for excised release bursts of stop consonants in isolation; these were similar to the effects for isolated clicks.
This outcome shows that the McGurk effect may occur even in non-speech settings.
Moreover, while phonological significance is not a prerequisite for the McGurk effect, it does seem to intensify it.
Internal Factors Impacting the McGurk Effect
Brain DamageThehemispheres of the braincooperate to integrate speech information received via the optic and aural senses (Baynes, Fummell & Fowler, 1994).Right-handed individuals, for whom words have privileged access to the left hemisphere and the face to the right hemisphere, are more likely to experience a McGurk effect.Research also shows that the McGurk effect, though present, is significantly slower for those who have undergone callosotomy.Moreover, visual stimuli strongly impact speech perception in individuals with lesions to the left hemisphere, demonstrating a larger McGurk effect than the average person (Schmid, Thielmann & Ziegler, 2009).However, they would be less likely to experience the McGurk effect if the damage to the left hemisphere had compromised their visual segment speech perception (Nicholson, Baum, Cuddy & Munhall, 2002).On the other hand, individuals whose right brain hemisphere has been damaged demonstrate impairment in visual-only as well as audio-visual integration functions.Moreover, though these individuals’ integration of the information can produce a McGurk effect, such integration appears only if optic stimuli are utilized to enhance performance when the aural signal is poor.Thus, although persons whose right hemisphere is damaged may exhibit a McGurk effect, it is not as strong as in a normal group.
Brain Damage
Thehemispheres of the braincooperate to integrate speech information received via the optic and aural senses (Baynes, Fummell & Fowler, 1994).Right-handed individuals, for whom words have privileged access to the left hemisphere and the face to the right hemisphere, are more likely to experience a McGurk effect.Research also shows that the McGurk effect, though present, is significantly slower for those who have undergone callosotomy.Moreover, visual stimuli strongly impact speech perception in individuals with lesions to the left hemisphere, demonstrating a larger McGurk effect than the average person (Schmid, Thielmann & Ziegler, 2009).However, they would be less likely to experience the McGurk effect if the damage to the left hemisphere had compromised their visual segment speech perception (Nicholson, Baum, Cuddy & Munhall, 2002).On the other hand, individuals whose right brain hemisphere has been damaged demonstrate impairment in visual-only as well as audio-visual integration functions.Moreover, though these individuals’ integration of the information can produce a McGurk effect, such integration appears only if optic stimuli are utilized to enhance performance when the aural signal is poor.Thus, although persons whose right hemisphere is damaged may exhibit a McGurk effect, it is not as strong as in a normal group.
Thehemispheres of the braincooperate to integrate speech information received via the optic and aural senses (Baynes, Fummell & Fowler, 1994).
Right-handed individuals, for whom words have privileged access to the left hemisphere and the face to the right hemisphere, are more likely to experience a McGurk effect.
Research also shows that the McGurk effect, though present, is significantly slower for those who have undergone callosotomy.
Moreover, visual stimuli strongly impact speech perception in individuals with lesions to the left hemisphere, demonstrating a larger McGurk effect than the average person (Schmid, Thielmann & Ziegler, 2009).
However, they would be less likely to experience the McGurk effect if the damage to the left hemisphere had compromised their visual segment speech perception (Nicholson, Baum, Cuddy & Munhall, 2002).
On the other hand, individuals whose right brain hemisphere has been damaged demonstrate impairment in visual-only as well as audio-visual integration functions.
Moreover, though these individuals’ integration of the information can produce a McGurk effect, such integration appears only if optic stimuli are utilized to enhance performance when the aural signal is poor.
Thus, although persons whose right hemisphere is damaged may exhibit a McGurk effect, it is not as strong as in a normal group.
Alzheimer’s DiseaseA study that investigated brain connectivity associated with Alzheimer’s disease (AD) via the evaluation of a crossmodal effect examined the McGurk effect in those afflicted with the disease and matched the control participants (Delbeuck, Collette & Van der Linden, 2007).The results unveiled the impairment of crossmodal integration in speech perception for AD. However, the phenomenon was not associated with interruptions in the distinct visual and auditory speech stimuli processing.This outcome implies that the specific aural-optic integration deficit in AD patients might result from a connectivity breakdown.
Alzheimer’s Disease
A study that investigated brain connectivity associated with Alzheimer’s disease (AD) via the evaluation of a crossmodal effect examined the McGurk effect in those afflicted with the disease and matched the control participants (Delbeuck, Collette & Van der Linden, 2007).The results unveiled the impairment of crossmodal integration in speech perception for AD. However, the phenomenon was not associated with interruptions in the distinct visual and auditory speech stimuli processing.This outcome implies that the specific aural-optic integration deficit in AD patients might result from a connectivity breakdown.
A study that investigated brain connectivity associated with Alzheimer’s disease (AD) via the evaluation of a crossmodal effect examined the McGurk effect in those afflicted with the disease and matched the control participants (Delbeuck, Collette & Van der Linden, 2007).
The results unveiled the impairment of crossmodal integration in speech perception for AD. However, the phenomenon was not associated with interruptions in the distinct visual and auditory speech stimuli processing.
This outcome implies that the specific aural-optic integration deficit in AD patients might result from a connectivity breakdown.
Specific Language ImpairmentA study that examined 28 preschoolers with Specific Language Impairment (SLI) and 28 preschoolers without SLI sought to analyze their capacity for auditory-visual integration (Norrix, Plante, Vance & Boliek, 2007).While both the groups performed equivalently in congruent audio-visual modalities, in the incongruent audio-visual condition, the children with SLI demonstrated a McGurk effect that was weaker than that observed for those without SLI.The results indicate that those with SLI experience a significantly lower McGurk effect than those without SLI.While they may pay less attention to articulatory gestures and employ less visual information in perceiving speech, they encounter no significant challenges in perceiving exclusively aural cues.
Specific Language Impairment
A study that examined 28 preschoolers with Specific Language Impairment (SLI) and 28 preschoolers without SLI sought to analyze their capacity for auditory-visual integration (Norrix, Plante, Vance & Boliek, 2007).While both the groups performed equivalently in congruent audio-visual modalities, in the incongruent audio-visual condition, the children with SLI demonstrated a McGurk effect that was weaker than that observed for those without SLI.The results indicate that those with SLI experience a significantly lower McGurk effect than those without SLI.While they may pay less attention to articulatory gestures and employ less visual information in perceiving speech, they encounter no significant challenges in perceiving exclusively aural cues.
A study that examined 28 preschoolers with Specific Language Impairment (SLI) and 28 preschoolers without SLI sought to analyze their capacity for auditory-visual integration (Norrix, Plante, Vance & Boliek, 2007).
While both the groups performed equivalently in congruent audio-visual modalities, in the incongruent audio-visual condition, the children with SLI demonstrated a McGurk effect that was weaker than that observed for those without SLI.
The results indicate that those with SLI experience a significantly lower McGurk effect than those without SLI.
While they may pay less attention to articulatory gestures and employ less visual information in perceiving speech, they encounter no significant challenges in perceiving exclusively aural cues.
AphasiaAn investigation of the ability of a person afflicted with mild aphasia to recognize tokens offered in visual-only, auditory-only, and audio-visual conditions yielded results meriting attention (Youse, Cienkowski & Coelho, 2004).The hypothesis was that in the bimodal condition, performance would be ideal and that the McGurk effect would exhibit integration of speech information.The results, however, did not support the hypotheses but suggested that a perseverative response pattern is limiting the successful integration of audio-visual speech information, and the utilization of bisensory speech stimuli may be compromised in adults afflicted with aphasia.
Aphasia
An investigation of the ability of a person afflicted with mild aphasia to recognize tokens offered in visual-only, auditory-only, and audio-visual conditions yielded results meriting attention (Youse, Cienkowski & Coelho, 2004).The hypothesis was that in the bimodal condition, performance would be ideal and that the McGurk effect would exhibit integration of speech information.The results, however, did not support the hypotheses but suggested that a perseverative response pattern is limiting the successful integration of audio-visual speech information, and the utilization of bisensory speech stimuli may be compromised in adults afflicted with aphasia.
An investigation of the ability of a person afflicted with mild aphasia to recognize tokens offered in visual-only, auditory-only, and audio-visual conditions yielded results meriting attention (Youse, Cienkowski & Coelho, 2004).
The hypothesis was that in the bimodal condition, performance would be ideal and that the McGurk effect would exhibit integration of speech information.
The results, however, did not support the hypotheses but suggested that a perseverative response pattern is limiting the successful integration of audio-visual speech information, and the utilization of bisensory speech stimuli may be compromised in adults afflicted with aphasia.
The McGurk Effect in Different Languages
Regardless of the language being used, listeners generally depend, to some degree, on visual information in speech perception. However, the intensity of the McGurk effect varies across languages.
For instance, Spanish, Italian, Turkish, English, Dutch, and German listeners experience a stronger McGurk effect than Chinese and Japanese listeners (Sekiyama, 1997; Bavo, Ciorba, Prosser & Martini, 2009; Erdener, 2015).
The cultural practice of avoiding eye contact and tonic and syllabic linguistic structures might account for this diminished effect among the Japanese as well as the Chinese.
Research also shows that, unlike English children, Japanese children do not demonstrate a developmental advancement in visual influence following age six (Sekiyama & Burnham, 2008; Hisanaga, Sekiyama, Igasaki & Murayama, 2009).
However, Japanese listeners recognize the incompatibility between aural and optic stimuli better than English listeners—perhaps because of the Japanese’s want for consonant clusters (Sekiyama & Tohkura, 1991).
Notwithstanding the manifest differences, listeners of all languages are compelled to rely on optic stimuli when audio stimuli are unintelligible. When this occurs, variation across languages disappears, and the McGurk effect is applied equally.
Is The McGurk effect an illusion?
References
Alsius, A., Navarra, J., & Soto-Faraco, S. (2007). Attention to touch weakens audiovisual speech integration.Experimental Brain Research,183(3), 399-404.
Bovo, R., Ciorba, A., Prosser, S., & Martini, A. (2009). The McGurk phenomenon in Italian listeners.Acta Otorhinolaryngologica Italica,29(4), 203.
Baynes, K., Funnell, M. G., & Fowler, C. A. (1994). Hemispheric contributions to the integration of visual and auditory information in speech perception.Perception & Psychophysics,55(6), 633-641.
Boersma, P. (2012). A constraint-based explanation of the McGurk effect.Phonological Architecture: Empirical, Theoretical and Conceptual Issues, 299-312.
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Delbeuck, X., Collette, F., & Van der Linden, M. (2007). Is Alzheimer’s disease a disconnection syndrome?: Evidence from a crossmodal audio-visual illusory experiment.Neuropsychologia,45(14), 3315-3323.
Erdener, D. (2015). The McGurk illusion in Turkish.Turkish Journal of Psychology. 30(76): 19–31.
Massaro, D. W., & Stork, D. G. (1998). Speech recognition and sensory integration: a 240-year-old theorem helps explain how people and machines can integrate auditory and visual information to understand speech.American Scientist,86(3), 236-244.
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Nicholson, K. G., Baum, S., Cuddy, L. L., & Munhall, K. G. (2002). A case of impaired auditory and visual speech prosody perception after right hemisphere damage.Neurocase,8(4), 314-322.
Schmid, G., Thielmann, A., & Ziegler, W. (2009). The influence of visual and auditory information on the perception of speech and non‐speech oral movements in patients with left hemisphere lesions.Clinical linguistics & phonetics,23(3), 208-221.
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Sekiyama, K., & Burnham, D. (2008). Impact of language on development of auditory‐visual speech perception.Developmental science,11(2), 306-320.
Sekiyama, K., & Tohkura, Y. I. (1991). McGurk effect in non‐English listeners: Few visual effects for Japanese participants hearing Japanese syllables of high auditory intelligibility.The Journal of the Acoustical Society of America,90(4), 1797-1805.
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Walker, S., Bruce, V., & O’Malley, C. (1995). Facial identity and facial speech processing: Familiar faces and voices in the McGurk effect.Perception & Psychophysics,57(8), 1124-1133.
Youse, K. M., Cienkowski, K. M., & Coelho, C. A. (2004). Auditory-visual speech perception in an adult with aphasia.Brain injury,18(8), 825-834.
Saul McLeod, PhD
BSc (Hons) Psychology, MRes, PhD, University of Manchester
Saul McLeod, PhD., is a qualified psychology teacher with over 18 years of experience in further and higher education. He has been published in peer-reviewed journals, including the Journal of Clinical Psychology.
Olivia Guy-Evans, MSc
BSc (Hons) Psychology, MSc Psychology of Education
Olivia Guy-Evans is a writer and associate editor for Simply Psychology. She has previously worked in healthcare and educational sectors.
Ayesh PereraResearcherB.A, MTS, Harvard UniversityAyesh Perera, a Harvard graduate, has worked as a researcher in psychology and neuroscience under Dr. Kevin Majeres at Harvard Medical School.
Ayesh PereraResearcherB.A, MTS, Harvard University
Ayesh Perera
Researcher
B.A, MTS, Harvard University
Ayesh Perera, a Harvard graduate, has worked as a researcher in psychology and neuroscience under Dr. Kevin Majeres at Harvard Medical School.
