Delay discounting and preference reversal
A hyperbolic discounter values £60 now against £100 in 30 days. Drag the extra delay to push both rewards further off together, and watch the curves cross: the preference flips from impatient to patient even though nothing but the common delay has changed. The discount rate k sets the steepness.
The stop-signal race
On a stop trial a go response (whose finishing times form the curve below) races a stop process that completes at SSD + SSRT. If the go process finishes first — in the shaded tail — the response escapes; otherwise it is inhibited. Lengthen the SSRT (slower brakes) or the SSD (a later signal) and the escape probability climbs. Go-RT is fixed at a mean of 490 ms, SD 90.
One number, many profiles
The UPPS-P model splits trait impulsivity into five facets that do not collapse into one. Set each independently: two very different people can share the same average score while differing entirely in which facet drives it. The correlate notes are illustrative of the literature, not computed from your input.
- no single facet is elevated — this profile would look average on a global impulsivity score