8th Annual Meeting of the International Multisensory Research Forum
    Home > Papers > Philip Jaekl
Philip Jaekl

Auditory-visual sensory integration lowers visual detection thresholds and raises discrimination thresholds
Poster Presentation

Philip Jaekl
Psychology, York University

Laurence Harris
Psychology and Biology, York University

     Abstract ID Number: 50
     Full text: Not available
     Last modified: June 11, 2007
     Presentation date: 07/06/2007 10:00 AM in Quad Maclauren Hall
     (View Schedule)

Auditory-visual sensory integration causes visual enhancement in a luminance detection task (Stein et al., 1996) which may result, in part, from changes in parvocellular activity. Facilitation was assessed using a detection task and a discrimination task in which sounds were presented before, synchronized with and after visual targets. The QUEST adaptive method was used in both conditions. Detection condition: a two-alternative forced choice (2afc) metacontrast masking task with a circular visual target followed by an annular mask. Sound-target synchrony resulted in lower luminance thresholds for detecting the presence of a target compared to when no sound occurred, or when sound onset preceded target onset. Thresholds were also lowered when the sound was synchronous with the mask at target-mask interstimulus intervals < 50ms. Discrimination condition: a 2afc orientation task requiring participants to discriminate a vertically oriented Gabor patch from a tilted one. Threshold angles for discriminating Gabor patch orientations increased in the presence of a sound at all sound-target onset asynchronies and were highest when sound onset followed target onset. These results are compatible with a sound-induced activity increase in the parvocellular visual pathway. This study demonstrates psychophysically that auditory-visual integration affects simple visual stimulus detection and stimulus feature discrimination differently.

Support Tool
  For this 
refereed conference abstract
Capture Cite
View Metadata
Printer Friendly
Author Bio
Define Terms
Related Studies
Media Reports
Google Search
Email Author
Email Others
Add to Portfolio

    Learn more
    about this

Public Knowledge

Open Access Research
home | overview | program
papers | organization | schedule | links