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Related Experiment Video

Updated: May 30, 2026

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments

Published on: January 23, 2017

Wohlgemuth was right: distracting attention from the adapting stimulus does not decrease the motion after-effect.

Michael J Morgan¹

¹Max-Planck Neurological Institute, Koeln, Germany. Michael.Morgan@nf.mpg.de

Vision Research

|August 16, 2011

Summary

This summary is machine-generated.

Distracting attention during visual motion adaptation did not reduce the motion after-effect. This suggests attentional load does not impact motion perception sensitivity, contrary to prior research.

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Area of Science:

Visual perception
Neuroscience
Psychophysics

Background:

Motion after-effects demonstrate neural adaptation to visual motion stimuli.
The role of attention in modulating sensory adaptation remains debated.
Previous studies suggested attention influences adaptation, but used less rigorous methods.

Purpose of the Study:

To investigate if attentional load during motion adaptation affects the motion after-effect.
To use a bias-free method to quantify adaptation strength.
To clarify the relationship between attention, sensitivity, and adaptation in visual motion perception.

Main Methods:

Employed a two-alternative forced-choice (2AFC) procedure for bias-free measurement of contrast discrimination.
Measured adaptation by assessing the effect of a moving grating on contrast discrimination functions.
Manipulated attentional load using a distracting task during the adaptation phase.

Main Results:

Motion adaptation consistently shifted contrast discrimination functions, indicating adaptation.
Increased attentional load during adaptation did not significantly alter contrast discrimination or detection thresholds.
No consistent effect of attentional load on the strength of motion adaptation was observed.

Conclusions:

Attentional load during adaptation does not appear to modulate sensitivity in motion perception.
Observed effects in prior studies may be attributable to response biases rather than genuine changes in sensitivity.
This study provides evidence against a significant role for attention in modulating visual motion adaptation sensitivity.