The stimulus integration area for horizontal vergence

The area of spatial integration for initial horizontal disparity vergence

We investigated over what central area disparity in a random dot stereogram is integrated to stimulate an initial vergence response. Vergence was measured subjectively, with a forced choice dichoptic nonius vernier task following a brief (230 msec) stimulus presentation. Stimuli were random-dot stereograms showing a central circular disc of 12.5 min arc crossed retinal disparity in front of, an...

The Need for Horizontal Integration

Vergence findings and horizontal vergence dysfunction among first year university students in Benin City, Nigeria

PURPOSE The study was designed to determine the prevalence of vergence dysfunctions among first year university students in Nigeria and to document the measures that define the vergence system of the visual system. METHODS A cross-sectional study of first year students of the University of Benin, Benin City, Nigeria, who presented for the mandatory eye examination as part of their medical exa...

The stimulus as basis for audiovisual integration

We argue here that examination of the stimulus source is a prerequisite to understanding how audiovisual (AV) stimuli are processed perceptually. This is based on mounting evidence that the act of speech production generates mutlimodal events whose audible and visible components are highly correlated with each other and the vocal tract source. How this multimodal structuring is exploited percep...

Voluntary effort as a stimulus to accommodation and vergence.

Voluntary effort can be used to elicit changes in accommodation and vergence. We investigated the potential cross-coupling interactions of accommodative vergence/accommodation (AC/A) and vergence accommodation/vergence (CA/C) in response to voluntary effort. The responses of accommodation and vergence were measured simultaneously with a dual Purkinje image eye tracker and infrared optometer whi...