Neuronal basis of the motion aftereffect reconsidered

Alexander C. Huk, David Ress, David J. Heeger

Research output: Contribution to journalArticle

Abstract

Several fMRI studies have reported MT+ response increases correlated with perception of the motion aftereffect (MAE). However, attention can strongly affect MT+ responses, and subjects may naturally attend more to the MAE than control trials without MAE. We found that requiring subjects to attend to motion on both MAE and control trials produced equal levels of MT+ response, suggesting that attention may have confounded the interpretation of previous experiments; in our data, attention accounts for the entire effect. After eliminating this confound, we observed that direction-selective motion adaptation produced a direction-selective imbalance in MT+ responses (and earlier visual areas), and yielded a corresponding asymmetry in speed discrimination thresholds. These findings provide physiological evidence that population level response imbalances underlie the MAE, and quantify the relative proportions of direction-selective neurons across human visual areas.

Original languageEnglish (US)
Pages (from-to)161-172
Number of pages12
JournalNeuron
Volume32
Issue number1
DOIs
StatePublished - 2001

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Motion Perception
Magnetic Resonance Imaging
Neurons
Population
Direction compound
Discrimination (Psychology)

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Neuronal basis of the motion aftereffect reconsidered. / Huk, Alexander C.; Ress, David; Heeger, David J.

In: Neuron, Vol. 32, No. 1, 2001, p. 161-172.

Research output: Contribution to journalArticle

Huk, Alexander C. ; Ress, David ; Heeger, David J. / Neuronal basis of the motion aftereffect reconsidered. In: Neuron. 2001 ; Vol. 32, No. 1. pp. 161-172.
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