Early response activation in repetition priming: an LRP study

Area of Science:

• Cognitive Neuroscience
• Psychology
• Neuroscience

Background:

• Repetition priming suggests response codes bind to stimuli and are retrieved upon re-presentation.
• Behavioral evidence supports this, but electrophysiological studies show conflicting results on retrieval timing and nature.

Purpose of the Study:

• To determine the stage of information processing where decision and action codes are retrieved in repetition priming.
• To investigate the temporal dynamics of response code retrieval using electrophysiology.

Main Methods:

• Analysis of the lateralized readiness potential (LRP) to monitor motor cortex activity.
• Utilizing congruent and incongruent response conditions by varying tasks between study and test phases.
• Examining LRP activations in response to primed faces.

Main Results:

• Primed stimuli elicited LRP activations with opposite polarities for congruent and incongruent trials.
• These LRP differences occurred within the 250-300 ms time window.
• Indicating response-related motor cortex activity linked to the retrieval of correct and incorrect decision/action codes.

Conclusions:

• Decision and action codes bound to primed stimuli are retrieved at early stages of stimulus processing.
• These retrieved codes are transmitted to the motor cortex, influencing response preparation.