Finding

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

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 462.2 0.0 0.0505 —
ddm-vanilla 468.0 5.8 0.0574
  • aggregate DDM RT approximation
logistic-4param 468.1 5.9 0.0545 —
Full diagnostics (logL · n · params · max abs error)
Variant logL n Free params Max |error| Predicted points
sdt-2afc -229.1 560 2 0.1174 11
ddm-vanilla -231.0 560 3 0.1340 11
logistic-4param -230.1 560 4 0.1262 11

Residuals

Fit parameters and provenance

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

dirty fit

criterion=-0.063 · d_prime=0.084

Method
scipy.optimize.minimize
Commit
24fd416
Predicted points
11
BIC
470.9

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

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

dirty fit

boundary=1.044 · drift_per_unit_evidence=0.138 · non_decision_time=0.434

Method
scipy.optimize.minimize
Commit
67b9019
Predicted points
11
BIC
481.0

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

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

dirty fit

bias=-0.691 · lower_lapse=0.000 · slope=6.955 · upper_lapse=0.000

Method
scipy.optimize.minimize
Commit
24fd416
Predicted points
11
BIC
485.4

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

Observed points

Signed motion coherence p_right n
-51.200 0.0000 48
-25.600 0.0208 48
-12.800 0.1304 46
-6.400 0.3478 46
-3.200 0.5208 48
0.000 0.5000 92
3.200 0.6250 48
6.400 0.6087 46
12.800 0.9091 44
25.600 1.0000 47
51.200 1.0000 47

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.