CS-US間隔がキンギョの信号付き電撃選択の漸近的水準に及ぼす効果
1990 年 60 巻 6 号 p. 370-377
詳細
1990 年 60 巻 6 号 p. 370-377
In three shuttlebox experiments, goldfish were given a choice between signaled shocks in the CS compartment and unsignaled ones in the other, In Experiment I, 48 goldfish were given signaled shocks with either 1, 2, 4, or 8s ISI (CS duration) in the CS compartment. The asymptotic level of preference for signaled shock (PSS) was an inverted-U function of the ISI (CS duration). In Experiment II, 50 goldfish were given signaled shocks with either 0, 1, 2, 4, or 8s ISI, and with 8s CS duration in the CS compartments The asymptotic level of PSS was a linear function of the ISI, and extending the CS after the US offset was found to block PSS. In Experiment III, 30 goldfish were given signaled shocks with either 2, 4, or 8s ISI, and with 2s CS duration in the CS compartment. Asymptotically PSS was eliminated with such a brief CS-US gap as 2s. The contextual-fear hypothesis based on Wagner's SOP model could account for these results more precisely than any other major PSS hypotheses.
