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Related Experiment Videos

Motor and nonmotor event-related potentials during a complex processing task.

C H Hillman1, R J Apparies, B D Hatfield

  • 1Department of Kinesiology, University of Maryland, College Park 20742, USA.

Psychophysiology
|December 16, 2000
PubMed
Summary

The stimulus-preceding negativity (SPN) did not change with task difficulty, suggesting it is not a reliable indicator of cognitive resource allocation in this study.

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Area of Science:

  • Cognitive Neuroscience
  • Psychophysiology

Background:

  • The stimulus-preceding negativity (SPN) is a slow negative wave recorded over the scalp.
  • Its relationship to cognitive processes, particularly resource allocation, remains under investigation.

Purpose of the Study:

  • To investigate whether the SPN reflects cognitive resource allocation.
  • To determine if SPN amplitude varies with task difficulty.

Main Methods:

  • Participants performed a non-motor discrimination task with varying difficulty levels.
  • The auditory warning stimulus (S1) signaled task difficulty.
  • Electroencephalography (EEG) recorded SPN, P3, and contingent negative variation (CNV).
  • Behavioral data were also collected.

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Main Results:

  • SPN amplitude did not differ significantly between easy and difficult tasks.
  • Task difficulty modulated P3 amplitude for both S1 and S2.
  • CNV amplitude was not affected by task difficulty.

Conclusions:

  • The findings do not support the hypothesis that SPN is a direct index of cognitive demand.
  • P3 appears more sensitive to task difficulty than SPN or CNV in this paradigm.