Comparison of Portable and Dark Room Autokinetic Movement

Abstract

A portable apparatus for producing autokinetic (AK) movement is described and compared with the standard dark room method. Use of the portable apparatus results in a smaller amount and expanse of apparent movement, but the test-retest reliabilities are of the same order of magnitude as in the dark room method. The portable apparatus provides several advantages to the AK researcher. It is easy to handle; it can readily be disassembled; it eliminates the ventilation and light-proofing problems inherent in achieving a totally darkened room. This apparatus automatically measures the latency of onset of AK movement. The importance of controlling or measuring the latency of onset of AK movement is demonstrated.