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Speech and non-speech audio-visual illusions: a developmental study.

Tremblay C, Champoux F, Voss P, Bacon BA, Lepore F, Théoret H - PLoS ONE (2007)

Bottom Line: Recent data suggest that distinct processes underlie non-specific intersensory speech as opposed to non-speech perception.However, the development of both speech and non-speech intersensory perception across childhood and adolescence remains poorly defined.These data support the existence of independent maturational processes underlying speech and non-speech audio-visual illusory effects.

View Article: PubMed Central - PubMed

Affiliation: Department of Psychology, University of Montreal, Montreal, Canada.

ABSTRACT
It is well known that simultaneous presentation of incongruent audio and visual stimuli can lead to illusory percepts. Recent data suggest that distinct processes underlie non-specific intersensory speech as opposed to non-speech perception. However, the development of both speech and non-speech intersensory perception across childhood and adolescence remains poorly defined. Thirty-eight observers aged 5 to 19 were tested on the McGurk effect (an audio-visual illusion involving speech), the Illusory Flash effect and the Fusion effect (two audio-visual illusions not involving speech) to investigate the development of audio-visual interactions and contrast speech vs. non-speech developmental patterns. Whereas the strength of audio-visual speech illusions varied as a direct function of maturational level, performance on non-speech illusory tasks appeared to be homogeneous across all ages. These data support the existence of independent maturational processes underlying speech and non-speech audio-visual illusory effects.

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Related in: MedlinePlus

Percent of correct (non-biased) responses in the incongruent condition McGurk effect plotted as a function of lipreading ability.
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pone-0000742-g003: Percent of correct (non-biased) responses in the incongruent condition McGurk effect plotted as a function of lipreading ability.

Mentions: To further test the effect of age on the McGurk effect, individual subjects' ages were correlated with the number of trials in which a McGurk illusion was perceived. A two-tailed Pearson correlation revealed significant effects in both central (r = −0.475, p = 0.003) and peripheral (r = −0.459, p = 0.004) locations, as well as when both these conditions were collapsed (r = −0.49, p = 0.002; Figure 2). Finally, to determine the influence of lip-reading ability on the integration of audio-visual speech cues, a correlation between participants' correct responses in the mute control task and the number of McGurk illusions was computed. The correlation was not significant (r = −0.2, p = 0.23; Figure 3).


Speech and non-speech audio-visual illusions: a developmental study.

Tremblay C, Champoux F, Voss P, Bacon BA, Lepore F, Théoret H - PLoS ONE (2007)

Percent of correct (non-biased) responses in the incongruent condition McGurk effect plotted as a function of lipreading ability.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC1937019&req=5

pone-0000742-g003: Percent of correct (non-biased) responses in the incongruent condition McGurk effect plotted as a function of lipreading ability.
Mentions: To further test the effect of age on the McGurk effect, individual subjects' ages were correlated with the number of trials in which a McGurk illusion was perceived. A two-tailed Pearson correlation revealed significant effects in both central (r = −0.475, p = 0.003) and peripheral (r = −0.459, p = 0.004) locations, as well as when both these conditions were collapsed (r = −0.49, p = 0.002; Figure 2). Finally, to determine the influence of lip-reading ability on the integration of audio-visual speech cues, a correlation between participants' correct responses in the mute control task and the number of McGurk illusions was computed. The correlation was not significant (r = −0.2, p = 0.23; Figure 3).

Bottom Line: Recent data suggest that distinct processes underlie non-specific intersensory speech as opposed to non-speech perception.However, the development of both speech and non-speech intersensory perception across childhood and adolescence remains poorly defined.These data support the existence of independent maturational processes underlying speech and non-speech audio-visual illusory effects.

View Article: PubMed Central - PubMed

Affiliation: Department of Psychology, University of Montreal, Montreal, Canada.

ABSTRACT
It is well known that simultaneous presentation of incongruent audio and visual stimuli can lead to illusory percepts. Recent data suggest that distinct processes underlie non-specific intersensory speech as opposed to non-speech perception. However, the development of both speech and non-speech intersensory perception across childhood and adolescence remains poorly defined. Thirty-eight observers aged 5 to 19 were tested on the McGurk effect (an audio-visual illusion involving speech), the Illusory Flash effect and the Fusion effect (two audio-visual illusions not involving speech) to investigate the development of audio-visual interactions and contrast speech vs. non-speech developmental patterns. Whereas the strength of audio-visual speech illusions varied as a direct function of maturational level, performance on non-speech illusory tasks appeared to be homogeneous across all ages. These data support the existence of independent maturational processes underlying speech and non-speech audio-visual illusory effects.

Show MeSH
Related in: MedlinePlus