Model comparison for the effect of 5-HT depletion on the relationship between error rate and RT in the reward-size task (for Fig 2D).

a(mk), a(cond), e(mk), and e(cond) indicate the random effects of 5-HT depletion conditions on parameters a and e, respectively. The probability distribution of the random effects were as follows: a_mk and a_cond were ~N(0,σ²_mk) and ~N(0,σ²_cond), respectively. (a’_mk, e’_mk) and (a’_cond, e’_cond) were ~biNorm(0, ∑_mk) and ~biNorm(0, ∑_cond), respectively. E, error rate; RT, reaction time; mk, monkey; cond, treatment condition (pCPA-day1, pCPA-day2, or control). BIC is a relative measure of quality for the models (#1–4). ΔBIC denotes the difference from the minimum BIC.

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