Effort Discounting

The effort discounting task measures cost-benefit decision-making by requiring rodents to choose between a low-effort option yielding a small reward and a high-effort option yielding a larger reward. Effort is manipulated by increasing the fixed-ratio (FR) requirement on the high-reward lever or by inserting a physical barrier the animal must climb to reach the high-reward arm. The task engages anterior cingulate cortex (ACC), ventral striatum, and mesolimbic dopamine circuits that compute effort costs against expected reward magnitude. Disruptions in this circuit underlie motivational deficits seen in depression, Parkinson's disease, and negative symptoms of schizophrenia.

The primary outcome is the proportion of high-effort choices at each effort level, generating a discounting curve that describes how reward value declines as a function of response cost. The effort indifference point identifies the FR or barrier height at which the subject shifts preference to the low-effort alternative. Area under the effort-discounting curve provides a summary measure of effort tolerance. Choice latency, lever press rate on high-effort trials, and omission rate are recorded as secondary indices of motor capacity and task engagement.

ConductMaze manages effort-discounting protocols by programming escalating FR schedules or barrier configurations across trial blocks and monitoring lever presses in real time. The system verifies completion of the full FR requirement before triggering pellet delivery and flags incomplete high-effort trials separately from deliberate low-effort choices. Effort-discounting curves, indifference points, and within-session choice dynamics are generated automatically. The platform supports both lever-based and barrier-based effort manipulations within the same protocol template.