Fig. 3: Perception and memory activity in visual field coordinates.
From: Perception and memory have distinct spatial tuning properties in human visual cortex
a For every participant, ROI, and stimulus, we plotted the perception- or memory-evoked response (β) in the visual field position estimated by the pRF model (x, y) and then interpolated over 2D space. Hotter colors indicate larger BOLD responses in that part of the visual field. We then rotated the interpolated images by the polar angle location of the stimulus so that they aligned on the upper vertical meridian. Finally, we z-scored the images and then averaged over stimuli and participants to produce on average image per ROI and task. An example participant's V1 data during the perception task is shown in the two middle panels, and the group average V1 data during perception is shown at right. b Plots of perception-evoked and memory-evoked activity, averaged across all participants (N = 9), from V1, V2, and V3. These plots reproduce known features of spatial processing during perception, such as increasing receptive field size from V1--V3. They also qualitatively demonstrate that perceptual activity is not perfectly reproduced during memory retrieval but that some retinotopic organization is preserved.
