Threshold for conditioned suppression using x-rays as the pre-aversive stimulus.

摘要: Four male, 12-week-old Sprague-Dawley rats were used to determine the threshold for behavioral response X-irradiation using conditioned suppression technique. They maintained at 80 per cent body weight and initially trained stable performance on a VI 1 min schedule with 16 sucrose solution as reinforcement. After baseline was obtained, animals placed in instrumental conditioning box beneath X-ray machine half-hour session each day. While subjects actively pressing lever reinforcement, 15-sec exposures of 0.5 R/sec administered, followed immediately by electric shock. all had exhibited suppression, dose-rate decreased subsequent sessions an effort establish threshold. The results indicate that X-rays low 0.004 can be effective pre-aversive stimulus rat.