Worksheets on Edexcel GCSE Psychology 8.1 Perception, covering 8.1.1 Depth cues, illusions and constancies, 8.1.2 Direct Theory of Perception (Gibson, 1996), 8.1.3 Constructivist Theory of Perception (Gregory, 1970), and 8.1.4 Effects on perceptual set, with answers. Print them, or work through one on screen. Write your working straight onto the paper and Genie marks it question by question against the mark scheme.