Finding

palmer-huk-shadlen-2005.psychometric.subject.phs-jd

Palmer J, Huk AC, Shadlen MN. The effect of stimulus strength on the speed and accuracy of a perceptual decision. Journal of Vision, 2005, 5(5):376-404. · Human random-dot motion button reaction-time task · psychometric

Observed curve and fits

Joint-fit companions

Other findings jointly fit by the same model fits.

Fit diagnostics

Caveats on these fits (1 term)

Each tag below is attached to one or more candidate fits for this finding. The chip column in the table flags which row carries which tag.

aggregate DDM RT approximation
DDM likelihood uses aggregate chronometric constraints rather than a full trial-level response-time likelihood.
Variant AIC Δ AIC RMSE Caveats
sdt-2afc winner 310.4 0.0 0.0495 —
logistic-4param 316.3 5.8 0.0503 —
ddm-vanilla 321.8 11.3 0.0634
  • aggregate DDM RT approximation
Full diagnostics (logL · n · params · max abs error)
Variant logL n Free params Max |error| Predicted points
sdt-2afc -153.2 567 2 0.1089 11
logistic-4param -154.1 567 4 0.1180 11
ddm-vanilla -157.9 567 3 0.1519 11

Residuals

Fit parameters and provenance

sdt-2afc.palmer-huk-shadlen-2005.psychometric.subject.phs-jd

dirty fit

criterion=-0.220 · d_prime=0.202

Method
scipy.optimize.minimize
Commit
24fd416
Predicted points
11
BIC
319.1

Fitted with scipy.optimize.minimize via behavtaskatlas.model_fits.sdt-2afc; success=True; CONVERGENCE: RELATIVE REDUCTION OF F <= FACTR*EPSMCH

logistic-4param.palmer-huk-shadlen-2005.psychometric.subject.phs-jd

dirty fit

bias=-1.003 · lower_lapse=0.000 · slope=2.865 · upper_lapse=0.000

Method
scipy.optimize.minimize
Commit
24fd416
Predicted points
11
BIC
333.6

Fitted with scipy.optimize.minimize via behavtaskatlas.model_fits.logistic-4param; success=True; CONVERGENCE: NORM OF PROJECTED GRADIENT <= PGTOL

ddm-vanilla.palmer-huk-shadlen-2005.psychometric.subject.phs-jd

dirty fit

boundary=0.915 · drift_per_unit_evidence=0.379 · non_decision_time=0.372

Method
scipy.optimize.minimize
Commit
67b9019
Predicted points
11
BIC
334.8

Fitted with scipy.optimize.minimize via behavtaskatlas.model_fits.ddm-vanilla; success=True; CONVERGENCE: RELATIVE REDUCTION OF F <= FACTR*EPSMCH

Observed points

Signed motion coherence p_right n
-51.200 0.0000 47
-25.600 0.0000 47
-12.800 0.0000 48
-6.400 0.2500 48
-3.200 0.2979 47
0.000 0.4947 95
3.200 0.8750 48
6.400 0.9583 48
12.800 1.0000 47
25.600 1.0000 46
51.200 1.0000 46

Take it with you

Cover sheet

Self-contained Markdown for citation, slides, or notebooks

The cover sheet pins the finding to the atlas commit and includes the observed points, fit ranking, caveats, and provenance — everything needed to drop into a paper or notebook without losing the trail back to the deploy.