Modulation of inferotemporal cortex activation during verbal working memory maintenance.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Psycholinguistics

Background:

• The left inferotemporal cortex is known for visual word recognition and semantics.
• Its role in verbal working memory, particularly in maintaining linguistic information, requires further elucidation.

Purpose of the Study:

• To functionally localize an inferotemporal language area using fMRI.
• To investigate the involvement of this area in the active maintenance of visually presented words in working memory.
• To explore the neural mechanisms underlying verbal working memory, including functional connectivity.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to observe brain activity.
• Participants performed a working memory task involving visually presented words and pseudowords.
• Functional connectivity analysis was conducted to examine interactions between brain regions.

Main Results:

• A specific inferotemporal cortex region showed increased activity during the maintenance of words in working memory.
• This activity was modulated by memory load for words but not for pseudowords.
• Increased functional connectivity was observed between the inferotemporal language area and the left prefrontal cortex during word maintenance without visual input.

Conclusions:

• The inferotemporal cortex plays a crucial role in verbal working memory.
• Non-phonological language representations can be utilized in verbal working memory.
• Verbal working memory involves sustained activation of cortical language representations, guided by frontal regions.