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Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study

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Published on: August 18, 2020

Aberrant callosal morphology in ex-smokers.

Caitlin Dale¹, Delshad Kalantary², Eileen Luders^1,3,4

¹School of Psychology, University of Auckland, 1010 Auckland, New Zealand.

Journal of Integrative Neuroscience

|July 22, 2022

Summary

Former smokers show reduced corpus callosum size, indicating weaker brain connectivity. This study highlights lasting effects of smoking on the brain's white matter pathways.

Keywords:

brain corpus callosum ex-smokers posterior midbody smoking structural MRI white matter

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Published on: January 16, 2015

Area of Science:

Neuroscience
Neuroimaging
Brain Anatomy

Background:

Cigarette smoking causes brain structural changes, including in the corpus callosum.
Previous research noted hemispheric alterations in ex-smokers, but the corpus callosum remained unexamined.

Purpose of the Study:

To investigate corpus callosum morphology in ex-smokers compared to non-smokers.
To determine if smoking cessation impacts interhemispheric white matter structure.

Main Methods:

Compared callosal morphology in 107 ex-smokers and 193 non-smokers (aged 42-97).
Measured total callosal area and seven subregions using the Witelson parcellation scheme.

Main Results:

Ex-smokers had significantly smaller callosal areas in the posterior midbody and genu (uncorrected).
After multiple comparison corrections, only the posterior midbody difference remained significant.
A trend towards smaller isthmus area was observed in ex-smokers.

Conclusions:

Findings suggest reduced interhemispheric connectivity in ex-smokers.
Specifically, connectivity between frontal and temporal areas may be weaker in individuals who have quit smoking.