FMLY 1010 Lecture 28: Lecture 28

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University of Manitoba
Family Social Sciences
FMLY 1010
Christine A.Schippers

o98729 Tracking Objects in the Visual Field Tracking = the smooth movements of the eye used to follow the track of a moving object Tracking at birth is fairly inefficient, but improves rapidly Younger than 2 months show some tracking if the object is moving slowly 610 weeks tracking becomes skillful rather quickly Colour Vision Cone cells in the eyes are necessary for perceiving red, green, and blue o Present at 1 month (perhaps at birth) Infants can discriminate between various colours (almost as well as adults) A number of visual skills depend on a specific kind of visual stimulation during sensitive periods of development Visual deprivation at 6 monthsadolescence can prevent development of normal peripheral vision Sensitivity to global direction of motion is affected only by visual deprivation near birth Hearing and Other Senses Auditory Acuity Auditory acuity = how well we can hear Better auditory acuity than visual acuity at birth Newborns hear nearly as well as adults do o Only less acuity with high pitched sounds (needs to be louder for newborn to hear) Detecting Locations = Ability to detect the location of a sound Sounds arrive at one ear slightly before the other, allows us to judge location Cant tell where the sound is coming from if it comes from an equidistant location Newborns can judge general direction of sound (Details on page 115 about degreeshifts) Smelling and Tasting Smelling and tasting are intricately connected in infants, just as they are in adults Taste is detected by taste buds on the tongue 5 basic flavours: Sweet, sour, bitter, salty, umami Smell is registered in mucous membranes of the nose Senses of Touch and Motion Best developed senses (help with feeding) Rooting reflex relies on touch stimulus to the cheek Sucking reflex relies on touch in the mouth Especially sensitive to touch on mouth, face, hands, soles of feet, and abdomen Display sensitivity to temperature increase physical activity in a cold room
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