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Table 1 Distribution of sign- and goal-tracking animals by sex and drug exposure (SAL = saline, NIC = nicotine). A tracking score (see text) was calculated for each rat, based on conditioned approach behavior on the last 4 days of training. The score was used to classify rats within sex and drug exposure group as goal-trackers, intermediate, or sign-trackers

From: Sex differences in nicotine-enhanced Pavlovian conditioned approach in rats

  Goal-tracker Intermediate Sign-tracker
SAL Female, n = 12 25% 50% 25%
NIC Female, n = 12 0% 58% 42%
SAL Male, n = 13 46% 31% 23%
NIC Male, n = 11 9% 82% 9%