Visual, auditory and tactile stimuli compete for early sensory processing capacities within but not between senses

Emanuele Porcu, Christian Keitel, Matthias M. Müller (Lead / Corresponding author)

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

We investigated whether unattended visual, auditory and tactile stimuli compete for capacity-limited early sensory processing across senses. In three experiments, we probed competitive audio-visual, visuo-tactile and audio-tactile stimulus interactions. To this end, continuous visual, auditory and tactile stimulus streams (‘reference’ stimuli) were frequency-tagged to elicit steady-state responses (SSRs). These electrophysiological oscillatory brain responses indexed ongoing stimulus processing in corresponding senses. To induce competition, we introduced transient frequency-tagged stimuli in same and/or different senses (‘competitors’) during reference presentation. Participants performed a separate visual discrimination task at central fixation to control for attentional biases of sensory processing. A comparison of reference-driven SSR amplitudes between competitor-present and competitor-absent periods revealed reduced amplitudes when a competitor was presented in the same sensory modality as the reference. Reduced amplitudes indicated the competitor's suppressive influence on reference stimulus processing. Crucially, no such suppression was found when a competitor was presented in a different than the reference modality. These results strongly suggest that early sensory competition is exclusively modality-specific and does not extend across senses. We discuss consequences of these findings for modeling the neural mechanisms underlying intermodal attention.
Original languageEnglish
Pages (from-to)224-235
Number of pages12
JournalNeuroImage
DOIs
Publication statusPublished - 15 Apr 2014

Fingerprint

Dive into the research topics of 'Visual, auditory and tactile stimuli compete for early sensory processing capacities within but not between senses'. Together they form a unique fingerprint.

Cite this