This research investigates intersensory mechanisms that underlie the influence of auditory stimuli on visual perception. Findings from single-cell neurophysiology, event-related brain potentials, and functional MRI indicate that neurons in cortical areas that were once thought to be unisensory can be driven by stimuli from multiple modalities. Moreover, the timing of multisensory-driven activity is such that it is unlikely to be due to just to feedback from anatomically later cortical areas. A set of recently reported behavioral effects showing the enhancement of visual perception from informationally unrelated but concomitantly presented auditory stimuli seem to be manifestations of these multisensory mechanisms. To date, however, these effects have not been understood in terms of any common intersensory mechanism. This research tests the audiovisual temporal-encapsulation hypothesis which states that an abrupt transient auditory stimulus defines a temporal window within which the representation of visual stimuli that appear in that time window are isolated from interaction with temporally surrounding visual information. This hypothesis can account for all of the effects reviewed above and it makes novel predictions beyond these, which are the focus of the present proposal. Significantly, the intersensory effects that have been reported in the literature are primarily examples of visual facilitation by concomitant auditory stimuli. The new predictions that we have derived from the audiovisual temporal encapsulation hypothesis are examples of impaired visual perception by concomitant auditory stimuli, which make them especially powerful for testing the hypothesis. The general idea is that if visual information is encapsulated by concomitant auditory stimuli, then it follows that tasks that require integration of that encapsulated visual information with information sampled at a different time will be impaired. This idea will be tested in three specific aims.
Specific Aim 1 tests the effects of auditory stimuli in a visual integration task.
Specific Aim 2 tests the effects of auditory stimuli on the processes by which visible persistence for moving stimuli is actively suppressed known, as motion deblurring.
Specific Aim 3 tests the effects of auditory stimuli on the processes by which visual information is suppressed during eye movements, known as saccadic suppression. If confirmed, the audiovisual temporal-encapsulation hypothesis could explain why people are susceptible to auditory distraction when engaged in what are primarily visual tasks (e.g., driving). Moreover, the encapsulation process might be a mechanism that is subject to failure in impaired states due to drugs, alcohol or disease. It may also be a mechanism that is subject to decline with age.

Public Health Relevance

This project seeks to understand the sensory mechanisms underlying the interaction between audition and vision under dynamic conditions (i.e., when stimuli are changing over time). These are important mechanisms because they determine when sensory stimulation in dynamic situations, such as when driving a car, will be distracting and possibly overwhelming. Moreover, they may be a source of non- optimal functioning with drugs, disease, development and/or aging.

Agency
National Institute of Health (NIH)
Institute
National Eye Institute (NEI)
Type
Exploratory/Developmental Grants (R21)
Project #
1R21EY023750-01
Application #
8575462
Study Section
Special Emphasis Panel (ZRG1-BBBP-T (52))
Program Officer
Steinmetz, Michael A
Project Start
2013-09-30
Project End
2015-09-29
Budget Start
2013-09-30
Budget End
2014-09-29
Support Year
1
Fiscal Year
2013
Total Cost
$222,350
Indirect Cost
$72,350
Name
University of Iowa
Department
Psychology
Type
Schools of Arts and Sciences
DUNS #
062761671
City
Iowa City
State
IA
Country
United States
Zip Code
52242