Adaptation to the locomotion speed of point-light walkers

Mather, George and Parsons, Todd (2017) Adaptation to the locomotion speed of point-light walkers. In: European Conference on Visual Perception, 27 - 31 August 2017, Berlin.

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Item Type:Conference or Workshop contribution (Lecture)
Item Status:Live Archive

Abstract

Adaptation to slowed-down or speeded-up videos of natural scenes depicting human locomotion causes later videos played at standard playback speed to appear too fast or too slow respectively (re-normalisation; ECVP 2015, 2016). Psychophysical data shows that the effect is qualitatively different from that obtained in retinal velocity after-effect experiments, and implicates a higher level process that encodes objective velocity. As a test for the involvement of high-level motion processes, we measured adaptation to locomotion speed using point-light walker (PLW) stimuli which varied in retinal size and facing direction while walking at a fixed locomotion speed. An after-effect of apparent locomotion speed was obtained using PLW adapting and test displays which was similar to the effect obtained with full-videos, and also transferred to test displays containing full-cue videos. To test whether the measured adaptation was due to a perceptual bias or to response or decision bias, we also measured the effect using a bias-free 2AFC method, rather than the method of single stimuli used in previous experiments. A significant adaptation effect was still obtained, indicating that a perceptual shift was responsible for the effect.

Keywords:motion, adaptation
Subjects:B Subjects allied to Medicine > B140 Neuroscience
C Biological Sciences > C830 Experimental Psychology
Divisions:College of Social Science > School of Psychology
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ID Code:29783
Deposited On:27 Nov 2017 15:47

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