Knowing when to stop: Aberrant precision and evidence accumulation in schizophrenia
Roberto Limongi , Bartosz Bohaterewicz , Magdalena Nowicka , Aleksandra Plewka , Karl J. Friston
AbstractPredictive coding and active inference formulations of the dysconnection hypothesis suggest that subjects with schizophrenia (SZ) hold unduly precise prior beliefs to compensate for a failure of sensory attenuation. This implies that SZ subjects should both initiate responses prematurely during evidence-accumulation tasks and fail to inhibit their responses at long stop-signal delays. SZ and healthy control subjects were asked to report the timing of billiards-ball collisions and were occasionally required to withhold their responses. SZ subjects showed larger temporal estimation errors, which were associated with premature responses and decreased response inhibition. To account for these effects, we used hierarchical (Bayesian) drift-diffusion models (HDDM) and model selection procedures to adjudicate among four hypotheses. HDDM revealed that the precision of prior beliefs (i.e., starting point) rather than increased sensory precision (i.e., drift rate) drove premature responses and impaired response inhibition in patients with SZ. From the perspective of active inference, we suggest that premature predictions in SZ are responses that, heuristically, are traded off against accuracy to ensure action execution. On the basis of previous work, we suggest that the right insular cortex might mediate this trade-off.
|Journal series||Schizophrenia Research, ISSN 0920-9964, (A 40 pkt)|
|Keywords in English||Temporal prediction, Active inference, Response inhibition, Dysconnection hypothesis, Schizophrenia, Diffusion models|
|Publication indicators||: 2017 = 1.113; : 2017 = 3.958 (2) - 2017=4.08 (5)|
|Citation count*||14 (2020-06-17)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.