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Related Experiment Videos

Temporal factors in target selection with saccadic eye movements.

Peter H Schiller1, Jennifer Kendall

  • 1Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. phschill@mit.edu

Experimental Brain Research
|September 19, 2003
PubMed
Summary

Researchers studied decision times for rhesus monkeys making eye movements to visual targets. Complex choices, like selecting between paired or multiple targets, significantly increased reaction times compared to single targets.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Ophthalmology

Background:

  • Saccadic eye movements are crucial for visual exploration.
  • Understanding decision-making processes in target selection is vital for cognitive neuroscience.
  • Previous research has explored reaction times but detailed decision-time analysis is ongoing.

Purpose of the Study:

  • To quantify decision times during visual target selection using saccadic eye movements.
  • To compare decision times across tasks involving single, paired, and multiple visual targets.
  • To investigate how target features influence choice probability in complex visual search.

Main Methods:

  • Rhesus monkeys performed three visual tasks: single target, paired targets with asynchronous presentation, and multiple targets requiring discrimination.

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  • Reaction times for saccadic eye movements to selected targets were recorded.
  • Target choice probability in the paired-target task was analyzed in relation to luminance, size, and temporal offset.

    • Main Results:

    • Decision times for selecting paired targets were 12-47 ms longer than for single targets.
    • Decision times for discrimination tasks were 17-70 ms longer than for single targets.
    • Target choice probability in paired-target tasks was significantly influenced by luminance and size, modulated by temporal offset.

    Conclusions:

    • The study quantifies the additional time required for decision-making in complex visual search tasks.
    • Results highlight the neural processing time associated with evaluating and selecting visual targets.
    • Findings contribute to understanding the temporal dynamics of decision-making in visually guided actions.