Effect of attentional load on audiovisual speech perception: evidence from ERPs

Alsius, Agnes and Möttönen, Riikka and Sams, Mikko E. and Soto-Faraco, Salvador and Tiippana, Kaisa (2014) Effect of attentional load on audiovisual speech perception: evidence from ERPs. Frontiers in Psychology, 5 . 727/1-727/9. ISSN 1664-1078

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Abstract

Seeing articulatory movements influences perception of auditory speech. This is often reflected in a shortened latency of auditory event-related potentials (ERPs) generated in the auditory cortex. The present study addressed whether this early neural correlate of audiovisual interaction is modulated by attention. We recorded ERPs in 15 subjects while they were presented with auditory, visual, and audiovisual spoken syllables. Audiovisual stimuli consisted of incongruent auditory and visual components known to elicit a McGurk effect, i.e., a visually driven alteration in the auditory speech percept. In a Dual task condition, participants were asked to identify spoken syllables whilst monitoring a rapid visual stream of pictures for targets, i.e., they had to divide their attention. In a Single task condition, participants identified the syllables without any other tasks, i.e., they were asked to ignore the pictures and focus their attention fully on the spoken syllables. The McGurk effect was weaker in the Dual task than in the Single task condition, indicating an effect of attentional load on audiovisual speech perception. Early auditory ERP components, N1 and P2, peaked earlier to audiovisual stimuli than to auditory stimuli when attention was fully focused on syllables, indicating neurophysiological audiovisual interaction. This latency decrement was reduced when attention was loaded, suggesting that attention influences early neural processing of audiovisual speech. We conclude that reduced attention weakens the interaction between vision and audition in speech.

Item Type: Article
Keywords: audiovisual speech perception, multisensory integration, McGurk effect, attention, event-related potentials
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Psychology
Identification Number: 10.3389/fpsyg.2014.00727
Depositing User: Eprints, Support
Date Deposited: 05 Dec 2017 09:49
Last Modified: 06 Dec 2017 02:08
URI: http://eprints.nottingham.ac.uk/id/eprint/48528

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