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Related Experiment Videos

Priming reduces input activity in right posterior cortex during stem completion

R D Badgaiyan1, M I Posner

  • 1Institute of Cognitive and Decision Sciences, University of Oregon, Eugene 97403, USA.

Neuroreport
|November 25, 1996
PubMed
Summary
This summary is machine-generated.

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Event-related potentials (ERPs) reveal reduced brain activity in the right posterior cortex for primed words, confirming positron emission tomography findings. This suggests the right posterior cortex is involved in processing primed stimuli efficiently.

Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Previous positron emission tomography (PET) studies indicated reduced cerebral blood flow in the right posterior cortex during primed word processing.
  • This suggested a decreased processing demand in this region for primed tasks.

Purpose of the Study:

  • To investigate the temporal dynamics of neural processing for primed stimuli using event-related potentials (ERPs).
  • To confirm and extend previous PET findings by examining the time course of cortical activity changes.

Main Methods:

  • Event-related potentials (ERPs) were recorded from 40 healthy subjects during a stem completion task.
  • Participants were presented with either primed or unprimed word stems.

Main Results:

Related Experiment Videos

  • Primed stems elicited significantly attenuated positivity in right posterior ERPs between 60 and 200 ms post-stimulus onset compared to unprimed stems.
  • Attenuated positivity was also observed in right frontal channels after 250 ms for primed stems.

    • Conclusions:

    • The findings support and refine previous PET data, implicating the right posterior cortex in the bottom-up processing of primed stimuli.
    • The observed ERP attenuation suggests reduced neural resource allocation for primed stimuli, potentially reflecting increased processing efficiency and decreased explicit recall demands.