Fig 1.
Psychophysical calibration session.
The graphs illustrate the selection of motion coherence levels yielding a rightwards response in 25% (low ambiguity), 50% (high ambiguity) and 75% (low ambiguity) of cases. The solid curve represents the best-fitting psychometric function for a representative subject, and describes the probability of a rightwards response as a function of the motion coherence of the RDM stimulus. The scatter plot shows the raw data from which the estimate was computed.
Fig 2.
Task ambiguity and outcome relevance.
Schematic representation of the two independent variables manipulated during the decision task: outcome relevance and task ambiguity. Low outcome relevance trials (no points at stake) were indicated by green dots; high outcome relevance trials (30 points at stake) were indicated by red dots.
Fig 3.
Interaction between NCC and outcome relevance.
The graph shows mean RTs as a function of NCC and outcome relevance (low; high). The asterisks highlight the significant increases in cognitive effort (RTs) which occurred in trials with high outcome relevance in medium and high NCC subjects but not low NCC subjects.
Fig 4.
Interaction between NCC and task ambiguity.
The graph shows mean RTs as a function of NCC and task ambiguity (low; high). The asterisks highlight the significant increase in cognitive effort (RTs) which occurred in high ambiguity trials in low and medium NCC subjects but not high NCC subjects.