A Shared Hippocampal Network in Retrieving Science-related Semantic Memories

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neuroimaging

Background:

• Revisiting the hippocampus's role in semantic memory retrieval is essential.
• Understanding the neural networks supporting semantic memory retrieval is a key research area.
• Distinguishing between correct and incorrect semantic memory retrieval provides insights into memory processes.

Purpose of the Study:

• To elucidate the functional brain network involved in retrieving correct and incorrect science-related semantic memories.
• To investigate the role of the hippocampus (HIP) in semantic memory retrieval using functional neuroimaging.
• To assess semantic memory retrieval and correctness monitoring in science majors.

Main Methods:

• Functional neuroimaging-based connectivity techniques were employed.
• Granger causality analysis was used to determine effective connectivity.
• Participants (46 science majors) retrieved 40 learned scientific concepts.

Main Results:

• The hippocampus (HIP) was significantly engaged in retrieving correct scientific concepts compared to incorrect ones.
• Effective connectivity in specific brain networks ([Formula: see text] and [Formula: see text]) was shared during retrieval of both correct and incorrect concepts.
• Connectivity strengths in certain brain networks ([Formula: see text] and [Formula: see text]) were more pronounced for correct concept retrieval.

Conclusions:

• The hippocampus (HIP) plays a significant role in semantic memory retrieval, particularly for correct information.
• Shared hippocampal networks highlight the HIP's function as a hub coordinating the Insula (INS), Anterior Cingulate Cortex (ACC), and Middle Temporal Gyrus (MTG).
• These coordinated networks support the retrieval of semantic memories, especially for scientific concepts.