Neural Evidence Suggests Both Interference and Facilitation from Embedding Regularity into Visual Search.

Area of Science:

• Cognitive Neuroscience
• Experimental Psychology

Background:

• Regularity in visual search tasks is thought to aid performance.
• Previous studies suggest contextual cueing effects are facilitatory.

Purpose of the Study:

• To investigate the electrophysiological processing stages affected by regularity in visual search.
• To differentiate between facilitation and interference effects of regularity.

Main Methods:

• Electroencephalography (EEG) recorded from 72 participants during visual search tasks.
• Tasks included consistent-mapping, random-mapping, and mixed-mapping conditions.
• Analysis focused on N2-posterior-contralateral, stimulus-locked lateralized readiness potential (LRP), and response-locked LRP components.

Main Results:

• In mixed groups, contextual cueing led to interference in target selection, response selection, and execution.
• In the consistent-only group, high validity regularity facilitated target and response selection.
• Identified distinct global (validity) and local (activation) effects of regularity.

Conclusions:

• Regularity's impact on visual search is complex, involving both interference and facilitation.
• The overall reliability of information is crucial when evaluating regularity's influence on behavior.
• Electrophysiological markers reveal specific processing stages modulated by regularity.