REVEOZ-KRUSHINSKY REASONING TEST SOLVING IN BROWN-NORWAY RATS

Reasoning abilities of Norway rats were studied in Revecz-Krushinsky t est. In this test 12 opague plastic cylinders were placed in a row. Ra ts obtained the bait (sunflower seeds) after tipping the goal cylinder (from the feeder situated under it) independently of the number of on e tipped before. Positions of the baits were changed in the following order. the cylinder No 1 in the first trial, No 2 - in the second and so on up to the twelfth one. Rats were tested 3 times (12 trials, once a week) in a rectangular box with a starting chamber and a working pa rt with a special device which; excluded the influence of olfactory st imuli. Solution scores demonstrated that rats chose cylinders in the n onrandom manner and their behaviour, scores were similar to those of-c rows and monkeys. Analysis of errors and strategies of behaviour of ra ts showed that quick improvement of feeding was at least partly determ ined by easy acquisition of recent food positions (i. e., the algorith m of shifting).