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The chronicity effect

Journal of Clinical Psychology

|April 1, 1981

Summary

This summary is machine-generated.

The chronicity effect shows that brain functions distant from a lesion improve over time as the lesion stabilizes. However, functions in the damaged area may remain impaired, as seen in permanent dyslexia.

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Area of Science:

Clinical Neuropsychology
Neuroscience

Background:

Clinical neuropsychological interpretation relies on the localization principle and diaschisis.
The chronicity effect describes changes in diaschisis over time with nonprogressive lesions.

Observation:

A patient with left temporoparietal encephalitis was assessed over six years.
Initial testing revealed widespread impairments, with some recovery over time.

Findings:

Abilities not directly related to the lesion site recovered to normal functioning.
The patient developed permanent dyslexia, indicating persistent impairment in a localized function.

Implications:

The chronicity effect suggests that diaschisis recedes as lesions stabilize, allowing for functional recovery.
Permanent deficits can occur in functions localized to the damaged brain area, even as remote effects diminish.