Optogenetic self-stimulation in the nucleus accumbens: D1 reward versus D2 ambivalence.

By comparison, D2 ChR2 stimulation induced only a marginal trend toward elevation in basolateral amygdala, but still reached levels >280% above EYFP control levels (BLA: Mann-Whitney U, Z = 1.83, p = .067, r = 0.53), and similarly above unoperated naïve levels (BLA: Mann-Whitney U, Z = 1.802, p = .072, r = 0.52).

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Across all 9 test days, a slight trend was noted for EYFP control D1 mice to mildly prefer their laser spout over the alternative spout by nearly 2:1, but this failed to reach significance on any day (9 touches SEM±4 on laser spout, 4 SEM±3 on non-laser spout).

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