Prediction error and repetition suppression have distinct effects on neural representations of visual information
- The University of Queensland, Australia
- Australian Research Council Centre of Excellence for Integrative Brain Function, Australia
- John Curtin School of Medical Research, The Australian National University, Australia
Figures
Figure 1
Example stimulus displays and task design.
(A) Schematic of the stimuli and timing used in the experiment. Participants viewed a rapid stream of pairs of Gabors and monitored for an infrequent coloured target (10% of trials). The stimulus …
Figure 2
Univariate EEG results for the effect of repetition suppression and expectation on the second stimulus in a pair.
Panels A and B show the main effects of repetition suppression and expectation, respectively, over three post-stimulus epochs (100–200 ms, 200–300 ms, 300–400 ms) and across all electrodes. The main …
Figure 3
Results of the forward encoding modelling for orientation-selectivity.
(A) Time-resolved orientation tuning curve across all participants and conditions in response to the second Gabor in the pair. The forward encoding approach resulted in a tuning curve for each of …
Figure 4 with 1 supplement
The effect of repetition suppression and expectation on orientation selectivity measured using forward encoding modelling.
(A) Amount of orientation-selective information (given by the amplitude of the fitted Gaussian) from the EEG signal in response to the second Gabor in a pair, shown separately for repetition …
Figure 4—figure supplement 1
The effect of a different baseline period (−100 to 0 ms before onset of the first Gabor) on orientation selectivity for the two main conditions.
Population tuning curves averaged over the significant time period (79–150 ms) shown in Figure 4A. The curves, shown as fitted Gaussians, illustrate how overall stimulus representations are affected …
Figure 5
Peak (naive Bayes) classification accuracy of the presented grating orientation for expected and unexpected conditions.
The dotted line indicates chance performance (1/9 orientations). The error bars indicate ±1 standard error of the mean.
Figure 6
Cross-temporal generalisation of the forward encoding model based on grating orientations for the main effects of repetition suppression (upper panels) and expectation (lower panels).
The maps have been thresholded (indicated by opacity) to show clusters (black outlines) of significant orientation selectivity (permutation testing, cluster threshold p < 0.05, corrected cluster …
Figure 7
A schematic of the forward-encoding approach applied to EEG activity.
(A) Participants viewed individual gratings at fixation, each with a specific orientation. (B) Neural activity evoked by each grating was measured over the entire scalp. (C) Evoked neural responses …
Author response image 1
Videos
Video 1
Example of a stimulus sequence of Gabors in a typical alternating block.
https://doi.org/10.7554/eLife.33123.003Additional files
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Transparent reporting form
- https://doi.org/10.7554/eLife.33123.011
