Abstract
Water-deprived rats were trained to airlick in a chamber containing two drinking tubes through which air of ambient temperature and humidity was pumped. After each rat had learned to airlick and had developed a strong position preference for one of the tubes, the airstream emerging from that tube was heated to 42°C and saturated with humidity. The other airstream was heated to 42°C but its humidity was not increased. All rats developed a strong preference for licking the dry airstream and they maintained this preference throughout many position reversals. It is concluded that evaporative cooling of the orolingual tissues makes an important contribution to the reinforcement obtained from airlicking.
Published Version
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