Figure 1 : Experimental paradigm.

From: Local expectation violations result in global activity gain in primary visual cortex

Figure 1

(a) The coloured dot indicated which side of the screen was relevant, and the specific colour (orange or cyan) predicted the orientation of the gratings on that side (75% valid). Participants performed either a contrast or orientation discrimination task on the two consecutive gratings on the attended side (ignoring the gratings presented on the other side), in separate scanner runs. Importantly, the colour of the cued dot bore no relationship with the orientation of the gratings presented at the non-cued side. (b) The coloured dot predicted the orientation of the grating that subsequently appeared on that side of the screen. In this example, an orange dot predicted that a grating tilted clockwise from vertical would appear on the left. The cue contained no information about the likely orientation of the grating on the non-cued (right) side. (c) An overview of the experimental conditions in the current study. Cued (here, left) gratings could either have the expected or the unexpected orientation, and the orientation of non-cued (right) gratings could either be congruent or incongruent with the expectation cue.