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Effects of synaptic blockers on ON-transient DA neuron responses. A, ON-transient DA neuron light responses (Aa; 525 nm) were blocked by the ON-channel blocker l-AP-4 (Ab; n = 14) but were insensitive to GABAzine (Ac; n = 8) and strychnine (Ad; n = 5). B, ON-transient DA neuron responses (Ba) were reversibly blocked by CNQX (Bb, Bc; n = 6), but unaffected by AP-7 (Bd; n = 5). Flashes are indicated by square waves below response traces.
