Spatial working memory encoding type modulates prefrontal cortical activity.

Area of Science:

• Neuroscience
• Cognitive Psychology

Background:

• Spatial working memory (SWM) is crucial for cognitive function.
• The neural underpinnings of simultaneous versus sequential SWM encoding remain incompletely understood.
• Individual differences in visuospatial abilities (VSA) may relate to distinct brain activation patterns.

Purpose of the Study:

• To differentiate prefrontal cortex activity during simultaneous and sequential SWM encoding.
• To explore how brain activity patterns correlate with individual visuospatial abilities.

Main Methods:

• Near-infrared spectroscopy (NIRS) was used to measure hemodynamic activity.
• 39 healthy adults performed SWM tasks with sequential and simultaneous encoding conditions.
• Brain activity was analyzed in relation to task conditions and individual VSA.

Main Results:

• The bilateral dorsolateral prefrontal cortex exhibited greater activation during sequential encoding compared to simultaneous encoding.
• Individuals with higher VSA demonstrated reduced right-dorsolateral prefrontal cortex activation during simultaneous encoding, indicative of neural efficiency.
• These findings highlight task-dependent modulation of prefrontal cortex activity in SWM.

Conclusions:

• Prefrontal cortex activation patterns during SWM are modulated by the encoding strategy (sequential vs. simultaneous).
• Neural efficiency, characterized by hypoactivation in specific prefrontal regions, may underlie superior visuospatial abilities.
• This research contributes to a deeper understanding of the neural substrates supporting spatial working memory and individual cognitive differences.