DEP-3103 Lecture Notes - Lecture 8: Visual Acuity, Binocular Vision, Depth Perception
Document Summary
Visual acuity (not good at birth; 20/200 20/600) Binocular vision (combining two visual fields) develops at 14 weeks. Before 14 weeks, infants perceive vision separately from each eye. 2-3 months show signs of reaction to depth perception. I(cid:373)(cid:373)ediately after (cid:271)irth, (cid:374)e(cid:449)(cid:271)or(cid:374)s sho(cid:449) prefere(cid:374)(cid:272)e for (cid:373)other"s fa(cid:272)e (and common visual stimuli); 3 months show preferences for faces of their own race. *around 9 months, infants lose ability to distinguish differences in uncommon visual stimuli (e. g. , lemur faces) Synaptic pruning phenomenon believed to be responsible for the loss of discriminatory ability. Hearing frequency sensitivity (infants have worse medium frequencies than adults and better low and high frequencies than adults) Sound localization direction of sound determined by arrival differences between the two ears (harder for infants to do this due to head shape and size) I(cid:374)fa(cid:374)ts also sho(cid:449) auditory prefere(cid:374)(cid:272)es for sti(cid:373)uli (cid:894)(cid:373)other"s (cid:448)oi(cid:272)e(cid:895) Smell acuity most fully developed (relative to adult sensitivity) at birth.
