Table 1.

Definitions and values of the parameters.

	Definition	Value
M	The total number of odors presented and granule cell population	100 (Figs. 3e, f, 4–6), 50 (Figs. 3c, d, 7)
N	The total number of glomeruli	400 (Figs. 3–6), 200 (Fig. 7)
co	The probability of a odor being present	3/M, except Fig. 6b, d
σx	The variance of noise on the glomeruli activity	1.0
ση	The variance of the noise in the reward	0.01
msp	The spontaneous firing rate of M/T cells	5 Hz
τr	The timescale of firing rate dynamics	50 ms
$T_{\max }$	The duration of each trials	5000 ms, except for Fig. 3f
$t_{\min }$	The initial count for the global learning rate, 1/t	100 [trials]