Positive emotions preferentially engage an auditory-motor "mirror" system.

Social interaction relies on the ability to react to communication signals. Although cortical sensory-motor "mirror" networks are thought to play a key role in visual aspects of primate communication, evidence for a similar generic role for auditory-motor interaction in primate nonverbal communication is lacking. We demonstrate that a network of human premotor cortical regions activated during facial movement is also involved in auditory processing of affective nonverbal vocalizations.

Suppression of sebaceous gland development in laboratory animals by 17alpha-propyltestosterone.

Topical application of the testosterone derivative 17alpha-propylandrost-4-en-17beta-ol-3-one (Win 17665) caused a dose-related regression of the hamster flank organ and guinea pig supracaudal gland in mature male animals. Histological examination confirmed that this action of Win 17665 was on the size of the hamster sebaceous glands and was reversible on cessation of treatment. Topical application of Win 17665 also counteracted flank organ stimulation by directly applied 5-alpha-dihydrotestosterone and 4-androstene-3,17-dione.