Fig. 2
From: Evidence for causal top-down frontal contributions to predictive processes in speech perception
Behaviour. a Experiment 1 design. A Match trial is shown. In a Mismatch trial, the written and vocoded words would share no phonology (for example the written cue ‘clay’ might be paired with the vocoded word ‘sing’). b Group-averaged clarity ratings for each condition. Error bars represent standard error across individuals within each group. c Four alternative forced choice vocoded word identification task. d Group-averaged per cent correct report for each condition. Chance performance at 25%. Error bars represent standard error across individuals within each group. e Overall group fits for single subject Bayesian data modelling of the data from b. f Derived parameters from the Bayesian data modelling. A.U., arbitrary units. Patients with nfvPPA displayed significantly more precise prior expectations than controls (Wilcoxon U(11,11) p < 0.01). They also displayed a trend towards a reduction in perceptual thresholds (Wilcoxon U(11,11) p = 0.075)
