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Related Experiment Videos

Accessory stimulus effects on response selection: does arousal speed decision making?

S A Hackley1, F Valle-Inclán

  • 1University of Missouri-Columbia, USA. HackleyS@missouri.edu

Journal of Cognitive Neuroscience
|July 13, 1999
PubMed
Summary

Accessory stimuli facilitate choice reaction times (RTs) by influencing earlier response selection stages, not by speeding up late motor processes. This study introduces post-trial blinking latency as a novel ERP measure.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Psychophysiology

Background:

  • Accessory stimuli can facilitate choice reaction times (RTs).
  • Previous research indicated this facilitation doesn't stem from speeding up motor execution (LRP to movement onset).

Purpose of the Study:

  • To investigate how accessory stimuli affect response selection stages.
  • To determine if accessory stimulation influences earlier or later phases of response selection.
  • To introduce a novel event-related potential (ERP) measure: post-trial blinking latency.

Main Methods:

  • Modified a choice reaction time task to probe response selection.
  • Analyzed the lateralized readiness potential (LRP) and reaction times.
  • Introduced and measured spontaneous, post-trial blinking latency.

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Main Results:

  • The interval from LRP onset to movement onset remained unchanged, indicating late response selection is not affected.
  • Amplitude modulation of the LRP on no-go trials suggests earlier response selection is influenced by accessory stimuli.
  • Post-trial blinking latency was recorded as a novel dependent measure.

Conclusions:

  • Accessory stimuli modulate earlier stages of response selection, not later motor preparation.
  • The findings contribute to understanding the temporal dynamics of cognitive processing during reaction tasks.
  • Post-trial blinking latency shows potential as a new psychophysiological measure.