Choice- and trial-history effects on causality perception in Schizophrenia Spectrum Disorder

Perceiving causality is a low-level, immediate cognitive process based on temporal and spatial cues relating to a sensory event and could, therefore, be viewed as a perceptual judgement. It is known that perceptual judgements in general are affected by a choice- and trial history bias, however, it has not yet been fully understood how such a bias integrates into the perception of causality. Here, we investigate judgements of perceptual causality in Schizophrenia Spectrum Disorder (SSD) as a perceptual decision process with systematic influences from past choices and experiences. We analysed previously collected data from a causality-judgement experiment using Michotte launching events and examined the data for differences between patients with SSD and healthy control participants (HCs). We did this on several levels to shed more light on known dysfunctions in the judgement of cause-effect relations in SSD, such as the jumping-to-conclusions bias. Using multiple Generalized Linear Mixed-Effects Models (GLMMs) revealed a significant direct influence of the choice-history for both participant groups while the trial-history - that is previous stimulus experiences - appear to exert a more subtle influence on the current choice by modulating the effect of choice-history and current spatial and temporal properties. With respect to stimuli of a given trial, SSDs relied more on spatial properties and less on temporal properties than HCs. Furthermore, an analysis of potential dynamic adaptation effects across time suggested an increasing reliance on previous choices for SSDs, and a decreasing effect for HCs. This hintstowards a potentially maladaptive pattern which might contribute to biased causal attributions in SSD.