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Training and probe flowchart for the context-based analgesic effect in rats. Three groups were trained and tested in the three-phase experimental paradigm (Baseline: left column; Training: middle column; Probe: right column). Contexts A (black) and B (grey) were in the same room but brightly- and dimly-lit, respectively. HT, high temperature (52°C); LT, low temperature (48°C).
