Finding

roitman-shadlen-2002.psychometric.subject.monkey-2

Roitman JD, Shadlen MN. Response of neurons in the lateral intraparietal area during a combined visual discrimination reaction time task. Journal of Neuroscience, 2002, 22(21):9475-9489. · Classic macaque random-dot motion discrimination · 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
logistic-4param winner 2432.3 0.0 0.0084 —
sdt-2afc 2437.4 5.1 0.0124 —
ddm-vanilla 2440.1 7.8 0.0234
  • aggregate DDM RT approximation
Full diagnostics (logL · n · params · max abs error)
Variant logL n Free params Max |error| Predicted points
logistic-4param -1212.2 3,534 4 0.0155 11
sdt-2afc -1216.7 3,534 2 0.0340 11
ddm-vanilla -1217.1 3,534 3 0.0426 11

Residuals

Fit parameters and provenance

logistic-4param.roitman-shadlen-2002.psychometric.subject.monkey-2

dirty fit

bias=-0.671 · lower_lapse=0.000 · slope=4.451 · upper_lapse=0.002

Method
scipy.optimize.minimize
Commit
24fd416
Predicted points
11
BIC
2457.0

Fitted with scipy.optimize.minimize via behavtaskatlas.model_fits.logistic-4param; success=True; CONVERGENCE: RELATIVE REDUCTION OF F <= FACTR*EPSMCH

sdt-2afc.roitman-shadlen-2002.psychometric.subject.monkey-2

dirty fit

criterion=-0.075 · d_prime=0.124

Method
scipy.optimize.minimize
Commit
24fd416
Predicted points
11
BIC
2449.8

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

ddm-vanilla.roitman-shadlen-2002.psychometric.subject.monkey-2

dirty fit

boundary=1.208 · drift_per_unit_evidence=0.182 · non_decision_time=0.358

Method
scipy.optimize.minimize
Commit
67b9019
Predicted points
11
BIC
2458.6

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 297
-25.600 0.0000 294
-12.800 0.0548 292
-6.400 0.2313 294
-3.200 0.3737 297
0.000 0.5264 587
3.200 0.6973 294
6.400 0.8407 295
12.800 0.9492 295
25.600 0.9899 296
51.200 1.0000 293

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.