[Instrumental reconditioning at an ambient temperature of 35 +/- 1 degrees C after suppression of the reward in growing rat].
By shortening to 5 seconds the burst of "fresh air" delivered by one level-pressing in 6 or 3 20 minutes sessions of operant conditioning at the ambient temperature of 35 +/- 1 degrees C brings 7 and 3 growing rats up to the maximal value of instrumental acquisition in 2 and 1 sessions. The experiment is going on with 40 minutes sessions in which the first 15 minutes belongs to the reward suppression. In spite of this inhibitory factor there is through the stimulus presence reconditioning which leads to instrumental adaptation at the ambient hyperthermia of 38.5 +/- 0.5 degrees C. At this temperature the instrumental activity level is the same as at 35 +/- 1 degrees C, in 20 minutes and the rectal temperature is rising up to provide compensatory work (+ 2.39 degrees C. instead of + 1.34 degrees C. at 35 +/- degrees C.).
D000367:Age Factors; D000818:Animals; D001831:Body Temperature; D003216:Conditioning, Operant; D005108:Extinction, Psychological; D051381:Rats; D012201:Reward; D013696:Temperature
Reconditionnement instrumental à la température ambiante de 35 +/- 1 C après suppression de la récompense chez le rat en croissance