Tuning properties of radial phantom motion aftereffects

Date

2004

Authors

Price, N
Greenwood, John
Ibbotson, Michael

Journal Title

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Volume Title

Publisher

Pergamon-Elsevier Ltd

Abstract

Motion aftereffects are normally tested in regions of the visual field that have been directly exposed to motion (local or concrete MAEs). We compared concrete MAEs with remote or phantom MAEs, in which motion is perceived in regions not previously adapted to motion. Our aim was to study the spatial dependencies and spatiotemporal tuning of phantom MAEs generated by radially expanding stimuli. For concrete and phantom MAEs, peripheral stimuli generated stronger aftereffects than central stimuli. Concrete MAEs display temporal frequency tuning, while phantom MAEs do not show categorical temporal frequency or velocity tuning. We found that subjects may use different response strategies to determine motion direction when presented with different stimulus sizes. In some subjects, as adapting stimulus size increased, phantom MAE strength increased while the concrete MAE strength decreased; in other subjects, the opposite effects were observed. We hypothesise that these opposing findings reflect interplay between the adaptation of global motion sensors and local motion sensors with inhibitory interconnections.

Description

Keywords

Keywords: adaptation; article; human; human experiment; motion; movement perception; priority journal; spatial discrimination; stimulus response; time perception; visual stimulation; Adaptation, Ocular; Afterimage; Cerebral Cortex; Eye Movements; Humans; Motion Per Adaptation; Motion aftereffect; Phantom; Temporal frequency

Citation

Source

Vision Research

Type

Journal article

Book Title

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