A review of recent models of attention.

Attention is the name of the human process- which somehow selects from the signals presented those requiring immediate response, those which must be held in memory for later action, and those which must be integrated with each other and with prior information. Clearly, attention is not the only critical process. How the signal is encoded, the nature of usable signal units, short- and long-term memories, and the interaction of all of these with the arousal system are equally important. The present status of concepts of attention and their postulated interactions with some of these other processes are reviewed.