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Updated: Feb 22, 2026

Coherence between Brain Cortical Function and Neurocognitive Performance during Changed Gravity Conditions

Coherence between Brain Cortical Function and Neurocognitive Performance during Changed Gravity Conditions

Published on: May 23, 2011

Stability in neurovascular function at 3800m.

Hannah G Caldwell¹, Philip N Ainslie¹, Lindsay A Ellis¹

¹Centre for Heart, Lung and Vascular Health, School of Health and Exercise Sciences, University of British Columbia, Okanagan, Kelowna, Canada.

Physiology & Behavior

|October 3, 2017

Summary

This summary is machine-generated.

High altitude exposure did not impair cerebral blood flow (CBF) responses during cognitive tasks. This suggests that intact neurovascular function at altitude may not explain hypoxia-induced cognitive impairments.

Keywords:

Cerebrovasculature High altitude Hypoxia Neurocognition Neurovascular coupling

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Area of Science:

Neuroscience
Physiology
Altitude Medicine

Background:

Hypoxia at high altitudes can cause neurocognitive impairments, but the underlying mechanisms remain unclear.
A potential mechanism involves the uncoupling of neural activity and cerebral blood flow (CBF), known as functional hyperemia.

Purpose of the Study:

To investigate the impact of high altitude exposure on cerebral blood flow (CBF) responses during cognitive tasks.
To determine if impaired functional hyperemia contributes to altitude-induced neurocognitive deficits.

Main Methods:

Transcranial Doppler was used to measure CBF in 11 healthy individuals at sea level and after 3 and 7 days at 3800m.
Three tasks were employed: visual stimulation, verbal fluency, and a visuospatial task, each designed to evoke functional hyperemia.

Main Results:

All three cognitive tasks successfully evoked significant increases in CBF, demonstrating functional hyperemia.
The magnitude of the CBF response was task-specific, with greater responses observed in brain regions associated with each task (e.g., posterior for visual, left for verbal, right for visuospatial).
Crucially, high altitude exposure for 3 and 7 days did not alter these cerebral functional hyperemia responses.

Conclusions:

Neurovascular function, as measured by functional hyperemia during cognitive tasks, remains intact after short-term exposure to 3800m.
Impaired functional hyperemia is unlikely to be the primary cause of neurocognitive impairments reported at high altitudes.