mental deterioration

Few reports of his mental illness discuss lead poisoning as a possible reason for his mental deterioration.

An unaccountable increase in piety is sometimes the first warning of approaching mental deterioration.

This is especially true as regards prognosis and the question of mental deterioration in any given case.

Epileptic attacks, if they occur with any frequency at all, invariably cause mental deterioration.

It is not the habit, however, that has caused the mental deterioration.

Garth experienced a quick sympathy, yet behind the mental deterioration of extreme old age something useful might lurk.