Fig. 6: Perceptual detection task provides conceptual replication of key findings.

A Example task trial. In the perceptual detection task, two thirds of trials were equivalent to trials in the MEG decision making task (Fig. 1A). In one third of trials, following presentation of the probability stimulus (750 ms), the probability stimulus was removed and the three outcome stimuli were presented. One of the these (the probed stimulus) had an arrow placed upon it and the participant was required to respond as quickly as possible to report the arrow direction. B Choice Probability Weight relates to response time marker of probability prioritization. Response Time Probability Weight, \({{{{{{\rm{\beta }}}}}}}_{{{{{{\rm{prob}}}}}}\left({{{{{\rm{RT}}}}}}\right)},\) measures the effect of the probe stimulus’s probability (conditioned on accepting the gamble presented earlier in the trial) on the participant’s response time in reporting the arrow’s direction. Negative values for \({{{{{{\rm{\beta }}}}}}}_{{{{{{\rm{prob}}}}}}\left({{{{{\rm{RT}}}}}}\right)}\) indicate faster responses when the probed stimulus is more probable, indicative of the more probable outcome being represented during the Probability stimulus presentation. We observed a negative relationship between \({{{{{{\rm{\beta }}}}}}}_{{{{{{\rm{prob}}}}}}\left({{{{{\rm{RT}}}}}}\right)}\) and \({{{{{{\rm{\beta }}}}}}}_{{{{{{\rm{prob}}}}}}\left({{{{{\rm{choice}}}}}}\right)}\) which measures weighting of probability information in choice. This provides a conceptual replication of the MEG findings in Fig. 4. C Choice Reward Weight relates to response time marker of reward prioritization. Response Time Reward Weight, \({{{{{{\rm{\beta }}}}}}}_{{{{{{\rm{rew}}}}}}\left({{{{{\rm{RT}}}}}}\right)},\) measures the effect of the probe stimulus’s absolute reward (relative to the other gamble outcome) on the participant’s response time to report the arrow probe. We observed a negative relationship between \({{{{{{\rm{\beta }}}}}}}_{{{{{{\rm{rew}}}}}}\left({{{{{\rm{RT}}}}}}\right)}\) and \({{{{{{\rm{\beta }}}}}}}_{{{{{{\rm{rew}}}}}}\left({{{{{\rm{choice}}}}}}\right)}\) which measures weighting of reward information in choice. This provides a conceptual replication of MEG findings from Fig. 5. B, C P-values reflect one-sided t-test for spearman correlation. Tests reflect planned comparisons and thus are not corrected. A House and scissor images were obtained from svgrepo.com where they are published under MIT licenses. They were respectively created by Adam Whitcroft and scarlab.