Rarely used term for an excessive degree of intellectual activity; a form of mania. ... Origin: hyper-+ G. Phren, mind ... (05 Mar 2000) ... 
Type: Term Pronunciation: hī′pĕr-frē′nē-ă Definitions: 1. Rarely used term for an excessive degree of intellectual activity; a form of mania.
hyperphrenia 1. Excessive mental activity, such as that which occurs in the manic phase of manic-depressive psychosis or in the severe preoccupations associated with the psychoneuroses. 2. Intellectual capacity far above the average.