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Table 1.

The values of the constant and variable rewards in each condition, and the values of the corresponding mean, variance and coefficient of variation(CV)

Variable reward
ConditionConstant rewardLow (prob.)High (prob.)MeanVarianceCV
A1 0.5 0 (0.8) 2.5 (0.2) 0.5 200 
A2 0 (0.5) 2 (0.5) 100 
A3 0.2 0 (0.8) 1 (0.2) 0.2 0.16 200 
A4 0.8 0 (0.8) 4 (0.2) 0.8 2.56 200 
A5 0.5 0.1 (0.86) 3 (0.14) 0.5 200 
A6 0.2 (0.61) 2.25 (0.39) 100 
C1 15 5 (0.8) 55 (0.2) 15 400 133 
C2 25 5 (0.5) 45 (0.5) 25 400 80 
C3 45 5 (0.2) 55 (0.8) 45 400 44 
Variable reward
ConditionConstant rewardLow (prob.)High (prob.)MeanVarianceCV
A1 0.5 0 (0.8) 2.5 (0.2) 0.5 200 
A2 0 (0.5) 2 (0.5) 100 
A3 0.2 0 (0.8) 1 (0.2) 0.2 0.16 200 
A4 0.8 0 (0.8) 4 (0.2) 0.8 2.56 200 
A5 0.5 0.1 (0.86) 3 (0.14) 0.5 200 
A6 0.2 (0.61) 2.25 (0.39) 100 
C1 15 5 (0.8) 55 (0.2) 15 400 133 
C2 25 5 (0.5) 45 (0.5) 25 400 80 
C3 45 5 (0.2) 55 (0.8) 45 400 44 

In conditions A1–A6, variability was in volume of reward (μl), and in conditions C1–C3 variability was in concentration of reward (%). The probabilities of low and high variable rewards are in parentheses

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