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n. an increasing loss of peripheral vision to the point that one seems to be looking through a small tube (see tunnel vision). It results from reduced blood flow to the head, as may be experienced, for example, by pilots performing high-speed turning maneuvers in an aircraft.

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Psychology term of the day

May 25th 2024




1. the practice of taking committed action to achieve an end, particularly as it relates to a political or social goal. See also community action group; social action program.

2. in philosophy, the doctrine that any relationship between thought and reality is characterized by continuous activity on the part of the mind, rather than passive receptivity. —activist adj., n.