movement and the changing senses chapter 9 mcgraw-hill/irwin © 2012 mcgraw-hill companies. all...
TRANSCRIPT
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Movement and the Changing Senses
Chapter 9
McGraw-Hill/Irwin © 2012 McGraw-Hill Companies. All Rights Reserved.
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The communicative link between the human organism and the environment is in part made possible by the senses:
vision, proprioception, touch, taste, smell, and hearing.
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Understanding the Mechanics of Vision
Light rays converge and meet at a focal point
The cornea and the fluids in the eye refract (bend) the light rays
The lens can adjust the focal point by changing shape
Relaxation of the ciliary muscles causes the lens to flattenContraction of the ciliary muscles causes the lens to become more spherical
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Understanding the Mechanics of Vision
Accommodation is the adjustment of the eye to variations in distanceThe retina contains two photoreceptors
Rods are responsible for vision in low illumination (night vision)Cones are responsible for color vision and visual acuity
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Understanding the Mechanics of Vision
Macula lutea: an oval yellow spot at the center of the retina
Fovea centralis (point of best vision) is located here
Cone cells are concentratedThere is an absence of rod cells
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McGraw-Hill Copyright © 2011
Retina
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McGraw-Hill Copyright © 2011
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Understanding the Mechanics of Vision
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Physical Development of the Eye
The eye develops as an outgrowth of the forebrain
Part of the central nervous system6 cranial nerves govern vision
At birthThe eye is hyperopic (light focuses behind the retina)The retina contains mostly rod cells
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At birth
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Physical Development of the Eye
At 1 month postnatalCone cells appear
At 8 months postnatalMacula is mature
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Development of Selected Visual Traits and Skilled Motor
Performance
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Visual Acuity
Static visual acuityTarget and performer are stationary20/20 vision means that you see at 20 ft. what a person with normal vision sees at 20 ft.20/100 means that you see at 20 ft. what a person with normal vision sees at 100 ft.
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Visual Acuity
Degree of detail that can be seen in an objectA Snellen eye chart is used to determine visual acuity
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Visual Acuity
This Snellen eye chart is used with children in grades K-1 who may not be capable of letter recognition
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Visual Acuity
Birth 20/200 and
20/4006
months20/200
1 yr. 20/504-5 yr. 20/20
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Visual Acuity
Dynamic visual acuityAbility to see the detail in moving objectsAbility of the central nervous system to estimate an object’s directionAbility of the ocular-motor system “to catch” and “to hold” an object’s image on the eye’s fovea long enough to see detail
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Visual Acuity and Motor Performance
Both static and dynamic visual acuity play keys roles Dynamic visual acuity is highly correlated with success in
Free throw shootingBall catching
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Visual Acuity and Exercise
Aerobic activities appear to improve visual acuity for up to two hours post-exerciseIncrease in acuity due to increase in blood flow and oxygenation to the eye
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Visual Acuity and Aging
Age-related eye diseases (ARED) are the leading cause of loss of visual acuity
Conditions/diseases
Age-related macular degenerationGlaucomaCataractsSenile miosisDiabetic retinopathyPresbyopia
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AREDs
Age-related macular degeneration (AMD)Loss of central visionDry form
Breakdown of light sensitive cells in the maculaCentral vision affectedNot allowed to drive and will have trouble readingNo problem with general movement
Wet formNew blood vessels form behind the retina, leak, and destroy the macula
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AREDsNormal
AMDAmsler Grid
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AREDs
GlaucomaLeading cause of loss in visual acuity and blindnessHigh pressure in eyeLoss of peripheral visionEventual loss of central vision
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AREDs
CataractsClouding of the eye’s lensInitial symptoms include complaints of glare, colors that seem faded, and increased need for light when reading
Senile miosisNormal loss of light restriction to the eye with ageDecrease in resting diameter of the pupil
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AREDs
Diabetic retinopathyComplication of diabetesVessels in the retina may hemorrhageNormally clear vitreous humor discolorsDetached retina can occur
PresbyopiaInability to focus clearly on near objects as one ages
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Binocular Vision and Depth Perception
Binocular vision ~ coordinated eye movements Strabismus ~ misaligned eyes
Common at birth, but diminishes during the first week
Depth perceptionA cerebral function based upon information sent by the eye to the brain
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Binocular Vision and Depth Perception
The Visual CliffNote the mother attempting to coax the infant into crossing the apparent deep (cliff) sideInfants are capable of depth perceptionGibson & Walk’s (1960) classic experiment
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Field of Vision
Refers to the entire extent of the environment that can be seen without a change in fixation of the eye
Normal lateral peripheral vision = 90 degrees from straight ahead (180 degrees total)Normal vertical peripheral vision = 47 degrees above and 65 degrees below visual midline
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Field of Vision
David’s 1987 experiment examining peripheral vision processing during the performance of a catching task
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Aging and Depth Perception and Field of Vision
Both disease (AMD) and anatomical facial changes may cause a loss of depth perception/field of vision with age
Change in facial structureSenile ptosis
Drooping of the eyelid
Loss of fat tissue around orbital socket
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Eye Dominance
Refers to the ability of one eye to lead the other in tasks involving visual tracking and visual fixationHole-in-card test
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Eye Dominance
Unilateral dominanceRight-eyed and right-handedLeft-eyed and left-handed
Crossed-laterals dominanceRight-eyed and left-handedLeft-eyed and right handed
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Tracking and Object Interception
Tracking an object allows the performer to gain important information about the flight path of the objectSmooth pursuit system
Matching of eye movement speed and speed of a projectile
Saccadic eye-movement systemCorrects differences between projectile location and eye fixation
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Tracking and Object Interception
40-52 weeks
Can track a 180 degree arc
5-6 yr. Can track objects in horizontal plane
8-9 yr. Can track balls that travel in arc
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Tracking and Object Interception
Bassin anticipation timeCoincidence-anticipation
Process involving object interception
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Motor Development of Children with Visual
Impairments
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Blindness
A definition of blindness is based upon distance visionRanges from 20/200 (80% loss of vision) to total blindness Because visual curiosity elicits movement, the unsighted child is not visually motivated to explore the unseen world
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Blindness
Head and trunk control
Curiosity encourages lifting head and trunk in sighted childrenUnsighted child fusses when in a prone position – parent places child on the back which does not help with head and trunk control
Independent sittingOccurs in sighted children between 4 and 8 monthsAn unsighted child can perform this task at the same time if the parents have prepared the child
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Blindness
CreepingBy 10 months a sighted child can support him/herself on hands and knees to creep and exploreAn unsighted child has no enticement to exploreNoise making toys help the unsighted child to creep
Independent walking
Both sighted and unsighted children are able to walk independently at the same timeHowever, this task is usually delayed in unsighted children
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Blindness
Prehension Vision is extremely important in performing the task of prehensionThe unsighted child exhibits a delay
Play For the sighted child, play is spontaneousThe unsighted child is inactive and shows no desire to experiment with the environment
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Bayley Scale Items
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Nonvisual Senses
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Proprioceptive System
The ability to be aware of location and movements in space without visual referencesA factor contributing to the development of body awareness, spatial awareness, and directional awareness
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Proprioceptive System
MechanoreceptorsMuscle spindlesGolgi tendon organsJoint receptorsVestibular apparatus
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Proprioceptive System
Muscle spindlesCan gauge the amount of tension within the muscleSenses how the muscle is stretched
Golgi tendon organsMonitors tension in the muscle
Joint receptors“Limit detectors”
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Classic Knee Jerk
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Proprioceptive System
Vestibular apparatusLocated in the inner earRotational motion
Semicircular canals (angular accelerometers)
Linear accelerationOtolith organs (utricle and saccule)
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Cutaneous System
Tactile sensitivity (skin)Responses to tactile stimulation
Reflex responseBabinski reflex
Withdrawal responseMove away from unpleasant or painful object
Approach responseResponse to kisses and hugs
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Key Terms