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2016 ; 234
(5
): 1209-19
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The effect of synesthetic associations between the visual and auditory modalities
on the Colavita effect
#MMPMID26126803
Stekelenburg JJ
; Keetels M
Exp Brain Res
2016[May]; 234
(5
): 1209-19
PMID26126803
show ga
The Colavita effect refers to the phenomenon that when confronted with an
audiovisual stimulus, observers report more often to have perceived the visual
than the auditory component. The Colavita effect depends on low-level stimulus
factors such as spatial and temporal proximity between the unimodal signals.
Here, we examined whether the Colavita effect is modulated by synesthetic
congruency between visual size and auditory pitch. If the Colavita effect depends
on synesthetic congruency, we expect a larger Colavita effect for synesthetically
congruent size/pitch (large visual stimulus/low-pitched tone; small visual
stimulus/high-pitched tone) than synesthetically incongruent (large visual
stimulus/high-pitched tone; small visual stimulus/low-pitched tone) combinations.
Participants had to identify stimulus type (visual, auditory or audiovisual). The
study replicated the Colavita effect because participants reported more often the
visual than auditory component of the audiovisual stimuli. Synesthetic congruency
had, however, no effect on the magnitude of the Colavita effect. EEG recordings
to congruent and incongruent audiovisual pairings showed a late frontal
congruency effect at 400-550 ms and an occipitoparietal effect at 690-800 ms with
neural sources in the anterior cingulate and premotor cortex for the 400- to
550-ms window and premotor cortex, inferior parietal lobule and the posterior
middle temporal gyrus for the 690- to 800-ms window. The electrophysiological
data show that synesthetic congruency was probably detected in a processing stage
subsequent to the Colavita effect. We conclude that-in a modality detection
task-the Colavita effect can be modulated by low-level structural factors but not
by higher-order associations between auditory and visual inputs.