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Directional uncertainty in visually guided pointing.

Kestutis Kveraga1, Marian Berryhill, Howard C Hughes

  • 1Dartmouth College, Hanover, NH 03755, USA.

Perceptual and Motor Skills
|May 5, 2006
PubMed
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This study explored how stimulus-response uncertainty affects reaction times in visually guided pointing tasks. Results showed a novel quadratic relationship between uncertainty and reaction time, differing from established models.

Area of Science:

  • Cognitive Psychology
  • Human Factors
  • Neuroscience

Background:

  • Reaction time studies often reveal distinct stimulus-response (S-R) uncertainty functions, including Hick's law and step functions.
  • S-R compatibility is hypothesized to influence how uncertainty impacts response times, particularly concerning spatial congruence.

Purpose of the Study:

  • To test the hypothesis that S-R uncertainty affects reaction time when stimuli and responses lack egocentric spatial correspondence.
  • To investigate the time-course of visually guided pointing under varying levels of S-R uncertainty.

Main Methods:

  • Five undergraduate participants performed a visually guided pointing task.
  • Four levels of S-R uncertainty (1, 2, 4, 8 possible target locations) were manipulated.
  • Reaction times for pointing to peripherally located visual targets were recorded.

Related Experiment Videos

Main Results:

  • The observed reaction time function was quadratic, not matching previously reported models.
  • Response time increased quadratically with increasing S-R uncertainty in log2 steps.

Conclusions:

  • The findings challenge existing models of S-R uncertainty and reaction time.
  • Visually guided pointing exhibits a unique quadratic response function under increasing uncertainty.