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Mean free-riding ratios in each condition. Healthy subjects exhibited significantly different free-riding rates in each condition (condition I > II > III). Schizophrenia patients showed comparable free-riding rates across all 3 conditions, but showed relatively lower rates of free riding than the healthy group. Black asterisk: within-group difference; gray asterisk: between-group difference. SEs of each condition are represented as error bars. **P < .01; ***P < .001
