Fig. 8.

V-log I curves of control (A) and DA-IPC-depleted (B) fish at subjective dawn and dusk (n = 6 for each time point). Animals were kept in DD during the experiment. A, In control fish, the ERG sensitivity was reduced by ∼1 log unit at subjective dawn (▪) as compared with ERG sensitivity at subjective dusk (●); theV-log I curve determined at dawn was shifted to the right by ∼1 log unit as compared with that determined at dusk. B, No ERG sensitivity changes were observed in DA-IPC-depleted animals between subjective dawn (■) and dusk (○). Note that the V-log I curves were similar between dawn and dusk in DA-IPC-depleted fish. Data represent the means ± SE.