Neurosalience

Neurosalience #S4E10 with Nathan Spreng - Cognitive networks and how they vary with age and disease

Feb 14, 2024
Nathan Spreng, James McGill Professor and director of the Laboratory of Brain and Cognition, studies large-scale brain networks with fMRI. He discusses age-related changes in hippocampal and default network connectivity, multi-echo fMRI benefits, network dedifferentiation and compensation in aging, clinical translation for Alzheimer’s and cholinergic targets, and the push from mapping to multimodal mechanisms.
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ANECDOTE

From Poetry To Cognitive Neuroscience

  • Nathan Spreng switched from poetry to cognitive science after a memory class sparked his interest in how the brain shapes experience.
  • A case study about a patient who lost both past recollection and future imagination motivated his graduate research focus.
INSIGHT

Distinct Network Ensembles For Memory Types

  • Autobiographical recollection and semantic components map to distinct hippocampal‑temporal pole connectivity ensembles that differ by age.
  • Young adults show a unique recollective ensemble that becomes less distinct in older adults, aligning with behavioral narrative differences.
INSIGHT

Multi‑Echo fMRI Fixes Key Noise Problems

  • Multi-echo fMRI improves SNR and helps separate BOLD from non-BOLD noise across cortex, rescuing signal in regions like orbital frontal and temporal poles.
  • Spreng credits multi-echo acquisition and TE-dependence analysis as critical to compare groups and study individual differences reliably.
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