水を報酬とするオペラント行動のセッション内変動
報酬提示持続時間の多様性の効果
2004 年 74 巻 6 号 p. 556-561
詳細
2004 年 74 巻 6 号 p. 556-561
This study tested the hypothesis (McSweeney & Swindell, 1999) that habituation contributes to within-session decreases in drinking. Six rats' leverpressing was reinforced by water under a continuous reinforcement (CRF) schedule. During the fixed amount sessions, duration of reinforcement was fixed at 3 seconds. Reinforcement duration varied from 1 to 5 seconds, with a mean of 3 seconds, during variable amount sessions. Experimental phase lasted 10 successive days and consisted of 5 fixed amount and 5 variable amount sessions, alternating day by day. Within-session decreases in responding were steeper during fixed amount than variable amount sessions. In addition, response rates were well described as linear functions of cumulative number of reinforcements. The regression line for the fixed amount sessions had steeper slope and smaller x-axis intercept than those for the variable amount sessions. These results support the habituation hypothesis and are not explained by postingestive factors.
