Speech and non-speech audio-visual illusions: a developmental study.
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.
Tremblay
Corinne
C
Department of Psychology, University of Montreal, Montreal, Canada.
Champoux
François
F
Voss
Patrice
P
Bacon
Benoit A
BA
Lepore
Franco
F
Théoret
Hugo
H
D000161:Acoustic Stimulation; D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007088:Illusions / Q000502:physiology*; D008297:Male; D010775:Photic Stimulation; D013067:Speech Perception / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*; D055815:Young Adult
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