Women compared with men work harder for small rewards

Area of Science:

• Neuroscience
• Cognitive Psychology
• Behavioral Economics

Background:

• Sex differences in cost-benefit decision-making are known, but less is understood about effort-based tasks.
• Instrumental tasks involve physical exertion for rewards, with limited research on sex-based variations.

Purpose of the Study:

• To investigate sex differences in effort allocation and reward processing.
• To analyze motivational phases (invigoration, effort maintenance) across varying reward magnitudes, difficulties, and types.

Main Methods:

• An effort allocation task involving button presses for food and money tokens was administered to 81 participants (47 women).
• Analysis focused on invigoration and effort maintenance, considering reward magnitude, difficulty, and type.

Main Results:

• No significant sex differences were observed in invigoration.
• Women demonstrated higher effort maintenance and subjective ratings for small rewards compared to men.
• Men increased effort for larger rewards to match women's performance levels; differences were specific to reward magnitude, not cost (difficulty/type).

Conclusions:

• Women exert greater physical effort for smaller rewards, associating them with higher subjective value.
• Sex differences in perceived reward magnitude may influence behavioral preferences in decision-making.
• Cost-benefit analysis offers insights into potential mechanisms underlying sex differences in motivation and effort.