[Changes in the signal significance of olfactory stimuli when coupled with negative experiences in young puppies].

A 5-min centripetal acceleration made the initially indifferent response to eucalyptus smell negative and the initially positive response to the mother smell uncertain in newborn puppies. The aversion to eucalyptus smell preserved longer than to the mother smell. Prolongation of the acceleration up to 15 min. increased the duration of olfactory aversion. The duration of aversion increases from 1st to 20th day but is quickly suppressed in 12-13-day old puppies due, apparently, to the interfering effects on the part of "young" analyzers (vision, hearing) involved in the control of behaviour during this period of ontogenesis. The prolonged preservation of the aversion occurs in infrequent presentation of olfactory stimuli not reinforced with rotation. Combining of feeding with subsequent rotation decreases the amount of consumed food which is essential for understanding of some cases of anorexia in children subjected to radial acceleration.