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Functional connectivity with medial temporal regions differs across cultures during post-encoding rest.

Wanbing Zhang1, Jessica R Andrews-Hanna2,3, Ross W Mair4,5

  • 1Department of Psychology, Brandeis University, 415 South Street, MS 062, Waltham, MA, 02453, USA.

Cognitive, Affective & Behavioral Neuroscience
|July 27, 2022
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Summary

Culture shapes brain connectivity. East Asians showed distinct resting-state functional connectivity in medial temporal lobe regions compared to Americans, linked to cultural values, not memory performance.

Keywords:
CultureFunctional connectivityResting state functional connectivitySpecific memoryfMRI

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Cultural Neuroscience

Background:

  • Resting-state brain connectivity reveals individual differences and influences behavior, including memory.
  • Previous research suggests cultural variations in memory encoding and medial temporal lobe involvement.

Purpose of the Study:

  • To investigate how culture influences functional connectivity within medial temporal lobe regions.
  • To explore cross-cultural differences in resting-state functional connectivity between Americans and East Asians.

Main Methods:

  • 46 Americans and 59 East Asians underwent resting-state fMRI scans after encoding object images.
  • Left parahippocampal gyrus (anterior/posterior) and left hippocampus served as seed regions for connectivity analysis.

Main Results:

  • Left posterior parahippocampal gyrus connectivity differed: stronger with temporo-occipital regions in East Asians, and parieto-occipital regions in Americans.
  • Left anterior parahippocampal gyrus connectivity varied: stronger with temporal regions in East Asians, and frontal regions in Americans.
  • Connectivity patterns correlated with cultural values (independent self-construal, value of tradition) but not memory performance.

Conclusions:

  • Cultural background influences resting-state functional connectivity in medial temporal lobe regions.
  • Observed differences may relate to cultural variations in memory consolidation, holistic vs. analytic processing, or other trait/state-based processes.