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Adapting to expansion increases perceived time-to-collision.

R Gray¹, D Regan

¹Department of Psychology, York University, Ont., Canada.

Vision Research

|April 4, 2000

Summary

Adapting to expanding targets increases errors in estimating time-to-collision (TTC). Both binocular and monocular cues resulted in longer TTC estimates after adaptation, impacting depth perception.

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Area of Science:

Visual perception
Depth perception
Motion perception

Background:

Accurate time-to-collision (TTC) estimation is crucial for safe navigation and collision avoidance.
Previous research suggests that visual cues like changing size and disparity contribute to TTC perception.

Purpose of the Study:

To investigate how adaptation to an expanding visual target affects the accuracy of time-to-collision (TTC) estimation.
To determine if this effect differs between binocular and monocular visual information.

Main Methods:

A tracking method was employed to measure TTC estimation errors.
Participants adapted to an expanding visual target before performing TTC estimation tasks.
TTC estimates were assessed using binocular vision alone and monocular vision alone.

Main Results:

Following adaptation, TTC estimates were significantly longer compared to baseline conditions.
Binocular TTC estimates increased by 8-16% after adaptation.
Monocular TTC estimates showed a larger increase of 18-25% after adaptation.

Conclusions:

Adaptation to expanding targets induces systematic errors in TTC estimation.
Both binocular and monocular visual systems are affected, with monocular cues showing a greater susceptibility to adaptation effects.
Findings support the model where changing-size and changing-disparity information converge prior to motion-in-depth signal generation.

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