Figure 1. Experimental timelines and stimuli.

(A). During the imagery task participants were cued to imagine a red or green Gabor pattern for 10 sec. Next they performed a letter discrimination task, followed by the binocular rivalry display. Luminance profile shows the background luminance dynamics during the imagery period in experiment 2. (B). For the visual working memory task participants were presented with two Gabor patterns sequentially, and were then cued to remember only one. Following a retention period a test pattern was presented and participants were required to indicate its orientation in relation to the pattern held in memory. (C). During the iconic memory task participants were presented with seven Gabor patterns, and after the inter-stimulus interval (ISI) cued to remember only one of the seven. In the test phase a rotated Gabor pattern was displayed in the cued location and participants had to indicate its orientation in relation to the pattern held in memory.