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Related Experiment Video

Updated: May 18, 2026

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

Published on: April 11, 2025

Does delay impair localisation in blindsight?

D P Carey¹, C T Trevethan, L Weiskrantz

¹School of Psychology, University of Aberdeen, Aberdeen AB24 2UB, Scotland. d.carey@bangor.ac.uk

Neuropsychologia

|September 18, 2012

Summary

This summary is machine-generated.

Blindsight patient DB accurately localized visual targets after a 4-second delay, challenging theories linking sensorimotor skills to the dorsal stream. This suggests alternative neural pathways may support unconscious visual guidance.

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Area of Science:

Neuroscience
Cognitive Science
Visual Perception

Background:

Unconscious sensorimotor skills surviving geniculostriate pathway damage are linked to the dorsal stream.
Dorsal stream circuits are theorized to operate in real-time, necessitating immediate motor responses.

Purpose of the Study:

To investigate if introducing a delay impacts sensorimotor localization in blindsight.
To test the hypothesis that dorsal stream function is time-critical for unconscious visual guidance.

Main Methods:

Utilized eye-tracking and hand movement recording in patient DB, a known blindsight case.
Employed stimuli controlling for light scatter to verify prior observations.
Introduced a 4-second delay between visual stimulus presentation and motor response.

Main Results:

Patient DB's manual and saccadic localization abilities remained unaffected by the 4-second delay.
A control experiment ruled out decision-making at stimulus presentation as a confounding factor.

Conclusions:

DB's localization skills may not rely on dorsal stream circuits.
The findings challenge the notion that dorsal stream sensorimotor skills are severely compromised by temporal delays.