Figure 1
From: Intact predictive motor sequence learning in autism spectrum disorder
Behavioural task (a) Representation of a single trial. Participants observed a warning signal, followed by a fixation cross, then one of four different imperative stimuli (IS) and another fixation cross. Participants were advised to react as quickly as possible without sacrificing accuracy. Each of the four imperative stimuli corresponded to a specific finger press. (b) Overall task structure. Each participant completed seven blocks. Block order was the same for all participants. (c) Unpredictable condition. Transition matrix: All IS followed each other with equal probability, resulting in an unpredictable sequence. (d) Predictable condition. Sequences were generated from a first-order Markov sequence whereby numbers within the probability matrix represent the transition probabilities (16 possible combinations) and determined the relationship between the IS on trial t and trial t-1. The easy-predictable sequence is displayed here. Adapted from "Action reprogramming in Parkinson's disease: response to prediction error is modulated by levels of dopamine" by J. M. Galea et al., 2012, Journal of Neuroscience, 32(2):542–50. Copyright (2012) Galea et al.
