Skip to main content
Article thumbnail
Location of Repository

A ratio model of perceived speed in the human visual system

By S T Hammett, R A Champion, A B Morland and P G Thompson

Abstract

The perceived speed of moving images changes over time. Prolonged viewing of a pattern (adaptation) leads to an exponential decrease in its perceived speed. Similarly, responses of neurones tuned to motion reduce exponentially over time. It is tempting to link these phenomena. However, under certain conditions, perceived speed increases after adaptation and the time course of these perceptual effects varies widely. We propose a model that comprises two temporally tuned mechanisms whose sensitivities reduce exponentially over time. Perceived speed is taken as the ratio of these filters' outputs. The model captures increases and decreases in perceived speed following adaptation and describes our data well with just four free parameters. Whilst the model captures perceptual time courses that vary widely, parameter estimates for the time constants of the underlying filters are in good agreement with estimates of the time course of adaptation of direction selective neurones in the mammalian visual system

Year: 2005
DOI identifier: 10.1098/rspb.2005.3239
OAI identifier: oai:eprints.whiterose.ac.uk:1307

Suggested articles


To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.