Whole brain volume

What is whole brain volume and functioning?

Investigation of whole brain anomalies considers the collective volume of the entire brain in structural imaging, without considering regionally specific differences in the volume of any individual structures. Alternatively, whole brain imaging can also consider overall grey matter or white matter volume. Whole brain functioning assesses the degree of connectivity across multiple brain regions.

What is the evidence for whole brain volume and functioning?

Structural changes

Moderate quality evidence found lower brain weight in people with schizophrenia compared to controls. Moderate to low quality evidence found male patients who died by suicide had significantly heavier brains than male patients who died of natural causes. Increased male brain weight was associated with younger age of schizophrenia onset.

Moderate to high quality evidence found people with schizophrenia who were medicated or not medicated showed reductions in intracranial, whole brain grey and white matter, and total brain volume compared to controls. Cortical volume was reduced only in medicated patients. People with first-episode schizophrenia also showed reduced intracranial, whole brain, and grey matter volume. First-degree relatives of people with schizophrenia showed reduced total grey matter volume compared to controls, with no differences in white matter or whole brain volume.

Functional changes

Moderate quality evidence found decreased local organisation and small-worldness (balance of local organisation and global integration) in people with schizophrenia. There was reduced connectivity within the default network (self-related thought), the affective network (emotion processing), the ventral attention network (processing of salience), the thalamus network (gating information) and the somatosensory network (sensory and auditory perception). There was reduced connectivity between the ventral attention network and the thalamus network, the ventral attention network and the default network, the ventral attention network and the frontoparietal network (external goal-directed regulation), the frontoparietal network and the thalamus network, and the frontoparietal network and the default network. There was increased connectivity between the affective network and the ventral attention network.

February 2020

Last updated at: 11:50 pm, 12th February 2020
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NeuRA Libraries

Title Colour Legend:
Green - Topic summary is available.
Orange - Topic summary is being compiled.
Red - Topic summary has no current systematic review available.