Abstract
The effects of repeated trials on tonic immobility in the goldfish were studied in two conditions, spaced and massed distribution of repeated elicitation. Spaced distribution led to a linear decrease in immobility over the 7 testing days, while massed trials produced an initial increase in the response followed by a decrease, regardless of whether reelicitation was immediate or occurred after a 10-sec intertrial interval. The spaced trial data are consistent with results reported in other vertebrate species, while the massed trial data are partially at variance with published data. Suggestions are made concerning the methodology to be used in future studies.
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