PSYB51H3 Chapter 3: Sensation and Perception- chapter 3 .docx
Document Summary
Neurons in the cerebral cortex prefer lines, edges and stripes. Acuity: the smallest spatial detail that can be resolved. Eye doctors specify acuity in terms of 20/20. Vision scientists prefer to talk about the smallest visual angle of a cycle of the grating that we can perceive. Cycle: for a grating, a pair consisting of one dark bar and one bright bar. Simply one repetition of a black and white stripe. Visual angle: the angle subtended by tan object at the retina. Angle that would be formed by lines going from top and bottom of a cycle on the page, through the center of the lens and on to the retina. The resolution acuity represents one of the fundamental limits of spatial vision: it is the finest high contrast detail that can be resolved. The limit is determined primarily by the spacing of photoreceptors in the retina. Sine wave grating: a grating with a sinusoidal luminance profile.
