Associations among imaging measures (2): the association between gray matter concentration and task-induced...

Area of Science:

• Neuroscience
• Neuroimaging
• Cognitive Neuroscience

Background:

• Previous studies linked functional activation and gray matter (GM) structure in aging and clinical populations.
• Research often involved limited subject numbers, necessitating larger studies for robust findings.

Purpose of the Study:

• To investigate the association between functional activation and GM structures in healthy young adults.
• To detail the nature of this association in a large cohort without apparent GM atrophy.

Main Methods:

• Voxel-by-voxel regression analyses were employed.
• Examined associations between gray matter concentration (GMC) and brain activity during n-back tasks.
• Controlled for age, sex, and signal intensity in 248 participants.

Main Results:

• A positive correlation (greater GMC, greater activation change) was prevalent in activated/deactivated areas.
• A negative correlation (greater GMC, smaller activation increase) was noted in some regions.
• The positive correlation often occurred at the borders of GM structures.

Conclusions:

• Gray matter concentration is generally associated with task-related functional activation in young adults.
• The nature of this association can vary regionally, with implications for interpreting functional imaging data.
• Findings are critical for studies examining group or individual differences in brain function.