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Related Experiment Videos

Gap effect and reaction time distribution: simple vs choice manual responses

W Machado-Pinheiro1, L G Gawryszewski, L E Ribeiro-do-Valle

  • 1Departamento de Fisiologia, Universidade Federal Fluminense, Niterói, RJ, Brasil. mflwmp@vm.uff.br

Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Medicas E Biologicas
|January 7, 1999
PubMed
Summary

The gap effect, a reduction in reaction time, was observed for manual reaction times (MRT). However, express manual responses were not detected, unlike in saccadic reaction times (SRT).

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Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Human motor control

Background:

  • The gap effect reduces saccadic reaction times (SRT) when a fixation point is removed before target appearance.
  • The existence of express saccades linked to the gap effect is debated.
  • It is unclear if the gap effect or express responses occur in manual reaction times (MRT).

Purpose of the Study:

  • To investigate the presence of the gap effect in manual reaction times (MRT).
  • To examine manual reaction time distributions for evidence of express manual responses.

Main Methods:

  • Manual reaction times (MRT) were measured under simple and choice conditions.
  • The gap effect was assessed by comparing reaction times with and without a fixation point offset.

Related Experiment Videos

  • MRT distributions were analyzed to identify potential express responses.

    • Main Results:

    • A significant gap effect was found for both choice MRT (22 ms) and simple MRT (15 ms).
    • No clear evidence for express manual responses was observed in the MRT distributions.
    • Simple MRT distributions were shifted towards shorter reaction times compared to choice MRT.

    Conclusions:

    • The gap effect is present in manual reaction times (MRT), similar to saccadic reaction times (SRT).
    • Express manual responses, analogous to express saccades, were not detected in this study.
    • Task complexity (simple vs. choice MRT) influences manual reaction time distributions.