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Pre-extinction MK-801 attenuates the subsequent decline in contextual freezing following weak conditioning. MK-801 and DCS were injected 30 min prior to the extinction session. There were no acute effects of either drug during the extinction session itself (A). MK-801, but not DCS, increased contextual freezing at the subsequent test (B). N = 6–7 per group. *p < 0.05.
