Hyperfamiliarity for faces (HFF) is an uncommon disorder of perception.
Features: unfamiliar faces or things may be perceived as familiar.
Rarely, people who should be familiar may be difficult to identify.
The abnormal perception may be transient, or it may be persistent.
It may occur as an isolated finding, or as a result of a neurologic disorder.
Some of the neurologic conditions with hyperfamiliarity for faces include:
(1) epilepsy
(2) aortic dissection
(3) cognitive impairment
(4) encephalitis (limbic, other)
(5) focal brain lesion
Differential diagnosis:
(1) deja vu
(2) delusion of misidentification
