PSYB51H3 Chapter 3: Chapter 3 Notes
Document Summary
Chapter 3: spatial vision: from stars to stripes: visual system in cerebral cortex translate images into stripes, from primary visual cortex we separate into where and what. Retinal ganglion cells thalamus lgn primary visual cortex cortex. 3. 4 p. 54: if cycle falls on separate cones, we can make out grating, when cycle falls onto one cone we see gray field or aliasing. A visit to the eye doctor: snellen invented 20/20 system of measuring acuity. 20/40 means distance person can see letters / distance normal vision can see letters: e. g. 20/40 means you have to be at 20 ft. to see letters ppl can see at 40 ft. If you can read 20/20 latter you can see detail that subeneds 1 min of arc: most healthy adults have acuity of 20/15. Acuity for low-contrast stripes: spatial frequency: # of cycles of a grating per unit of visual angle, e. g. Visual angle btw each pair of white stripes is 0. 25 .
