| Abstract: | Investigated habituation of contraction responses in 2 experiments with a total of 7 sea anemones using response-independent and response-dependent intertrial intervals (ITIs). In Exp I, repeated presentation of water-stream stimulation at 4 stimulus durations produced replicable response decrements in 5 out of 6 Ss in the response-independent ITI conditions. 3 Ss habituated repeatedly in the response-dependent ITI condition. Instances of both dishabituation and retention of habituation were observed, and habituation was often accompanied by changes in the topography of responding. In Exp II, habituation retention intervals were assigned values of 30, 60, or 90 min. 2 out of 3 Ss exhibited less responding at the shorter intervals. The data constitute nonassociative learning in individuals of a species lacking a central nervous system. (30 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved) |
