Dissociable effects of top-down and bottom-up attention during episodic encoding

Area of Science:

• Neuroscience
• Cognitive Psychology
• Memory Research

Background:

• Episodic memory formation is influenced by attention, but neural mechanisms remain unclear.
• Understanding how attention modulates memory encoding is crucial for cognitive science.

Purpose of the Study:

• To investigate the distinct roles of top-down and bottom-up attention in episodic memory encoding of visual objects.
• To elucidate the neural mechanisms underlying attention's influence on memory formation.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used in humans to study attention and memory encoding.
• Manipulation of both top-down and bottom-up attention during visual object encoding.
• Functional connectivity analyses were performed to examine neural interactions.

Main Results:

• Dorsal parietal cortex (intraparietal sulcus, IPS) engagement correlated with successful episodic memory formation during top-down attention.
• Ventral parietal cortex (temporoparietal junction, TPJ) engagement correlated with memory encoding failure during bottom-up attention.
• IPS and TPJ showed opposing influences on perceptual cortices, affecting memory encoding likelihood.

Conclusions:

• Top-down attention, via IPS, enhances episodic memory encoding by positively influencing perceptual processing.
• Bottom-up attention, via TPJ, can impair episodic memory encoding by negatively influencing perceptual processing.
• Attention modulates memory by altering the perceptual processing of stimuli during encoding.