An Investigation of positive and negative reinforcement on alertness and friendliness measured by eye contact
Stanley Delmore Hill · CSUN ScholarWorks (California State University, Northridge) · 1972
I particularly when his verbal powers fail, or when objects 1 l of special shapes or sizes are being described.: Hand 1 (and head) movements may be closely coordinated with speech to indicate the internal structure of utterances, to control the synchronizing of utterances.(35) i I • .I l __ , ______ ._