Journal article

Phantom and concrete motion after effects have different temporal tuning

NS Price, MR Ibbotson

Journal of Vision | Published : 2003


Using motion aftereffects (MAE), we quantified the adaptation produced by an expanding concentric ring stimulus. The rings had sinusoidal luminance modulations and were presented in a 5 -diameter aperture against a mean grey background. Two adapting stimuli were used: a concrete stimulus (complete circle) and a phantom stimulus (complete circle minus two horizontal grey 40 -arc sectors either side of the mid-line). After adaptation, subjects indicated if test gratings presented for 0.4s in 30 -arc horizontal sectors were expanding (+) or contracting (-). The subjects adapted for 30s, then indicated the motion direction in 32 tests interleaved with 5s top-up adaptation periods. Adapting tempo..

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