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Sheep’s operant responses measured as the number of target touches within the 3 min of each trial during the days of weeks 5 (normal: white boxplots) and 6 (reversed: grey boxplots) towards video stimuli differing in presumed valence and intensity. Boxplots indicate data range as well as median, and lower and upper quartiles. Thick black lines are the model estimates, and thin black lines the 95% confidence intervals.
