Finding

roitman-shadlen-2002.psychometric

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
sdt-2afc winner 4372.2 0.0 0.0097 —
logistic-4param 4372.6 0.4 0.0126 —
ddm-vanilla 4373.4 1.2 0.0149
  • aggregate DDM RT approximation
ddm-drift-bias 4373.4 1.2 0.0125
  • aggregate DDM RT approximation
ddm-starting-point-bias 4374.2 2.0 0.0126
  • aggregate DDM RT approximation
Full diagnostics (logL · n · params · max abs error)
Variant logL n Free params Max |error| Predicted points
sdt-2afc -2184.1 6,149 2 0.0182 11
logistic-4param -2182.3 6,149 4 0.0247 11
ddm-vanilla -2183.7 6,149 3 0.0324 11
ddm-drift-bias -2182.7 6,149 4 0.0246 11
ddm-starting-point-bias -2183.1 6,149 4 0.0252 11

Residuals

Fit parameters and provenance

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

dirty fit

criterion=-0.024 · d_prime=0.116

Method
scipy.optimize.minimize
Commit
24fd416
Predicted points
11
BIC
4385.6

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

logistic-4param.roitman-shadlen-2002.psychometric

dirty fit

bias=-0.213 · lower_lapse=0.000 · slope=4.876 · upper_lapse=0.000

Method
scipy.optimize.minimize
Commit
24fd416
Predicted points
11
BIC
4399.5

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

ddm-vanilla.roitman-shadlen-2002.psychometric

dirty fit

boundary=1.057 · drift_per_unit_evidence=0.194 · non_decision_time=0.410

Method
scipy.optimize.minimize
Commit
10e1c18
Predicted points
11
BIC
4393.6

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

ddm-drift-bias.roitman-shadlen-2002.psychometric

dirty fit

boundary=0.974 · drift_bias=0.044 · drift_per_unit_evidence=0.210 · non_decision_time=0.410

Method
scipy.optimize.minimize
Commit
10e1c18
Predicted points
11
BIC
4400.3

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

ddm-starting-point-bias.roitman-shadlen-2002.psychometric

dirty fit

boundary=1.057 · drift_per_unit_evidence=0.194 · non_decision_time=0.410 · starting_point=0.509

Method
scipy.optimize.minimize
Commit
10e1c18
Predicted points
11
BIC
4401.1

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

Observed points

Signed motion coherence p_right n
-51.200 0.0000 516
-25.600 0.0020 511
-12.800 0.0629 509
-6.400 0.2441 512
-3.200 0.3740 516
0.000 0.4926 1,019
3.200 0.6582 512
6.400 0.7973 513
12.800 0.9455 514
25.600 0.9922 515
51.200 1.0000 512

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.