Search research articles

Search research articles

Related Experiment Videos

Global factors generate the McCollough effect.

P C Dodwell¹, R P O'Shea

¹Department of Psychology, Queen's University, Kingston, Ontario, Canada.

Vision Research

|January 1, 1987

Summary

This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Unified cognitive theory is not comprehensive.

The Behavioral and brain sciences·2014

Same author

On binocular alternation.

Perception·2001

Same author

Sharpness overconstancy: the roles of visibility and current context.

Vision research·1999

Same author

Colour at edges and colour spreading in McCollough effects.

Vision research·1999

Same author

Sharpness overconstancy in peripheral vision.

Vision research·1997

Same author

The effect of spatial frequency and field size on the spread of exclusive visibility in binocular rivalry.

Vision research·1997

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Global pattern structure is necessary for inducing McCollough effects (pattern-contingent colour aftereffects: PCCAES). This finding suggests visual processing occurs at a higher level than local feature detection.

Area of Science:

Visual perception
Neuropsychology
Cognitive science

Background:

McCollough effects (PCCAES) are colour aftereffects contingent on the orientation of inducing patterns.
Previous research suggested globally orthogonal pattern pairs from Hoffman's Lie Transformation Group Model of Neuropsychology (LTG/NP) can generate PCCAES.

Purpose of the Study:

To determine if global factors are necessary for generating PCCAES.
To investigate the role of local versus global pattern structure in PCCAES induction.

Main Methods:

Experiment 1: Observers made controlled eye movements over induction patterns.
Experiment 2: Patterns with varying degrees of global organization but constant local orthogonality were used.

Main Results:

Related Experiment Videos

PCCAES were as strong with controlled eye movements as with central fixation, indicating local adaptation is not solely responsible.
Global pattern orthogonality was sufficient to induce PCCAES, while local orthogonality was not.
The findings support the necessity of global structure in PCCAES generation.

Conclusions:

McCollough-type PCCAES are generated by visual system structures operating above local feature detection levels.
Hoffman's LTG/NP model provides a robust framework for understanding these global effects in visual perception.