Fig. 1.

Visual display and timing (in milliseconds; ms) of the task in the scanner. The emotional reaction of the recipient (here ‘emotional reaction’) was displayed after a jittered fixation cross. Subsequently, the screen displayed two offers each containing red and blue tokens, which indicated the share for the allocator and the recipient, respectively (here 5–5 vs 7–3). The name of the allocator was displayed in red (here ‘allocator’) and the name of the recipient in blue (here ‘recipient’). If participants did not respond within 6000 ms, a screen displaying ‘Too late!’ was presented. After the response, the decision screen remained on the screen until 6000 ms after the onset of the decision screen.