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Experimental Brain Research

, Volume 227, Issue 2, pp 223–229 | Cite as

Time perception during apparent biological motion reflects subjective speed of movement, not objective rate of visual stimulation

  • Guido OrgsEmail author
  • Louise Kirsch
  • Patrick Haggard
Research Article

Abstract

We have investigated links between biological motion perception and time perception. Participants compared the durations of two paired visual frames, inside which task-irrelevant sequences of static body postures were presented. The sequences produced apparent movements of shorter and longer path lengths, depending on the sequential order of body postures (ABC or ACB). Shorter and longer path lengths were paired with shorter and longer interstimulus intervals (ISIs) to produce path/ISI congruent sequences with intermediate subjective speeds and path/ISI incongruent sequences with slowest and fastest subjective speeds. Participants compared the duration of the visual frames surrounding these sequences; body postures and biological motion were irrelevant. The ability to discriminate the duration of the frames (as measured by the just noticeable difference, JND) was reduced for pairs of path/ISI congruent sequences as compared to pairs of path/ISI incongruent sequences. That is, duration discrimination improved when implied speed differed between the two sequences of a pair compared to when the implied speed was the same. Since stimuli showed no actual movement and were fully matched for lower-level visual input and objective stimulus durations, our findings suggest an involvement of higher-order visual or even motor areas in temporal biases during apparent biological motion perception. We show that apparent speed is the primary dimension of such percepts consistent with a dominant role of movement dynamics in the perception of other people’s actions. Our results also confirm an intimate relation between time perception and processing of human movement.

Keywords

Biological motion Apparent motion Time perception Visual body perception Duration discrimination Action observation Velocity perception 

Notes

Acknowledgments

This study was supported by a Leverhulme Trust research grant to P. Haggard. G. Orgs was supported by a research fellowship of the German Academic Exchange Service. P. Haggard was additionally supported by an ESRC Professorial Fellowship and by EU FP7 Project VERE (WP1). The study was approved by the UCL ethics committee.

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

221_2013_3502_MOESM1_ESM.ai (1.7 mb)
Supplementary material 1 (AI 1791 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.Institute of Cognitive NeuroscienceUniversity College LondonLondonUK
  2. 2.School of PsychologyBangor UniversityBangorUK

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