Compression of time during smooth pursuit eye movements

Alexander C. Schütz, M. Concetta Morrone

Research output: Contribution to journalArticlepeer-review

Abstract

Humans have a clear sense for the passage of time, but while implicit motor timing is quite accurate, explicit timing is prone to distortions particularly during action (Wenke & Haggard, 2009) and saccadic eye movements (Morrone, Ross, & Burr, 2005). Here, we investigated whether perceived duration is also affected by the execution of smooth pursuit eye movements, showing a compression of apparent duration similar to that observed during saccades. To this end, we presented two brief bars that marked intervals between 100 and 300. ms and asked subjects to judge their duration during fixation and pursuit. We found a compression of perceived duration for bars modulated in luminance contrast of about 32% and for bars modulated in chromatic contrast of 14% during pursuit compared to fixation. Interestingly, Weber ratios were similar for fixation and pursuit, if they are expressed as ratio between JND and perceived duration. This compression was constant for pursuit speeds from 7 to 14. deg/s and did not occur for intervals marked by auditory events. These results argue for a modality-specific component in the processing of temporal information.

Original languageEnglish
Pages (from-to)2702-2713
Number of pages12
JournalVision Research
Volume50
Issue number24
DOIs
Publication statusPublished - Dec 2010

Keywords

  • Attention
  • Color
  • Luminance
  • Saccadic eye movements
  • Smooth pursuit eye movements
  • Time perception

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems

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