Time and amount attributes exert distinct neural influences on gain and loss evaluation.

Regarding the LPP, although the context-by-time interaction did not reach statistical significance in the quadratic model, simple slopes analyses indicated that the time effect remained significant in the gain context, b = −0.75, z = −3.93, P < .001, but not in the loss context, b = −0.34, z = −1.78, P = .075, a pattern consistent with the primary linear analysis.

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Such design features could partially explain the marginally significant sign effect observed behaviorally and may have weakened the correspondence between discounting behavior and neural responses.

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