Figure 7.

Decoding the motor responses. Displayed are decoding accuracies from spatial motor response decoding analysis (80 ms width, 20 ms moving time steps, left vs right button press, 50% chance level; 100 ms time window analysis using a permutation test). A, Pure noise condition. Responses could only be decoded until after the presentation of the response mapping screen (peak 70% accuracy at 920–1000 ms). B, High discriminability object condition (stimulus duration 66.67 ms). Similar to all other object conditions (illustrated only for highest discriminability condition), motor responses could again only be decoded after the presentation of the response mapping screen (peak 79% accuracy at 940–1020 ms). Thus, participants made true category choices and did not prepare random motor responses. The absence of motor response encoding early in the trial also confirmed that motor response priming cannot explain our choice decoding results. Significant time windows are highlighted.