Velocity perception in a moving observer

Previous research has shown that when a moving stimulus is presented to a moving observer, the perceived speed of the stimulus is affected by vestibular self-motion signals (Hogendoorn, Verstraten, MacDougall, & Alais, 2017. Vision Research 130, 22–30.). This interaction was interpreted as a wei...

Full description

Saved in:
Bibliographic Details
Published in:Vision research (Oxford) 2017-09, Vol.138, p.12-17
Main Authors: Hogendoorn, Hinze, Alais, David, MacDougall, Hamish, Verstraten, Frans A.J.
Format: Article
Language:English
Subjects:
Discrimination (Psychology)
Female
Humans
Male
Motion Perception - physiology
Movement - physiology
Self-motion
Sensory Thresholds
Speed perception
Vestibular
Vestibule, Labyrinth - physiology
Visual motion
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Previous research has shown that when a moving stimulus is presented to a moving observer, the perceived speed of the stimulus is affected by vestibular self-motion signals (Hogendoorn, Verstraten, MacDougall, & Alais, 2017. Vision Research 130, 22–30.). This interaction was interpreted as a weighted sum of visual and vestibular motion signals. This interpretation also predicts effects of vestibular self-motion signals on perceived speed. Here, we test this prediction in two experiments. In Experiment 1, moving observers carried out a visual speed discrimination task in order to establish points of subjective equality (PSE) between stimuli presented in the same or opposite direction of self-motion. We observed robust effects of self-motion on perceived speed, with self-motion in the same direction as visual motion resulting in increases in perceived speed and vice versa. These effects were well- described by a limited-width integration window. In Experiment 2, the same observers carried out another speed discrimination task in order to establish discrimination thresholds. According to the Weber-Fechner law, these thresholds are expected to increase or decrease along with perceived speed. However, no effect of self-motion on discrimination thresholds was observed. This pattern of results suggests a limit on speed discrimination performance early in the visual system, with visuo-vestibular integration in later downstream areas. These results are consistent with previous work on heading perception.
ISSN:0042-6989
1878-5646
DOI:10.1016/j.visres.2017.06.001