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An optical communication system is any form of communications system that uses light as the transmission medium. Equipment consists of a transmitter, which encodes a message into an optical signal, a communication channel, which carries the signal to its destination, and a receiver, which reproduces the message from the received optical signal.
In social psychology, entitativity is the degree to which a group is perceived as a cohesive, unified entity. It describes how much a collection of individuals is seen as "group-like" and bonded by common attributes, such as shared goals or traits.
Social facilitation is a social phenomenon in which being in the presence of others improves individual task performance. [1] [2] That is, people do better on tasks when they are with other people rather than when they are doing the task alone.