PSYCH 1XX3 Lecture Notes - Lecture 4: Parietal Lobe, Neural Pathway, Two-Streams Hypothesis
8 Mar 2016
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Accommodation: changes in lens shape based on distance. Pictoral: motion parallax- if as we move past a scene the objects move too, they are close. If not: optic flow- closer objects are bigger and move more then they are farther. Things converge at horizon: texture and haze. Based on assumption that light hits from above. Higher up and closer to horizon=farther away. Convergence: eyes turn inwards to focus on close object. Retinal disparity: each eye sees a slightly different thing- brain analyzes this to perceive depth of object. Visual cliff experiments show that different eye placements still have depth perception. It is important to have multiple depth cues because not all work in every situation. 90% of infants were afraid to cross the deep half, showing that they can perceive depth: most likely that we have a predisposed fear of heights that strengthens with experience.
