Fig.3.

(a₁–a₄) Time traces of CBF₀ (t<0s) and forepaw stimulation-evoked cerebral blood flow (CBF) and (b₁–b₄) SEP potential changes during baseline period (e.g., t_b=−6 min shown in panels a₁–b₁; black traces) and after acute cocaine administration (e.g., 3-, 12-, and 24-min as shown in a₂–b₂, a₃–b₃, a₄–b₄, respectively; blue traces). Note that the red arrows indicate spontaneous neuronal activity. The baseline traces (black) for the field potential had the same voltage (v) as the post cocaine traces, i.e., no change before and after cocaine.