PEDS203 Lecture : Chapter 3 - Sensory Contributions To Skilled Performance

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taupewalrus464

22 Dec 2011

School

University of Alberta

Department

Physical Education and Sport

Course

PEDS203

Professor

Adrian Popescu

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Document Summary

Sept 29 chapter 3 sensory contributions to skilled performance. Sources of sensory info: exteroception: from outside the body (vision and audition, proprioception: from inside the body (vestibular apparatus, muscle spindles, Structure of the inner ear: 3 semi-circular canals angular acceleration, otholith organs: utricle (horizontal) and saccule (vertical, role: maintain static and dynamic equilibrium, vestibule-occular reflex stabilize image on retina during head movement (ex. Read: muscle spindle tell how much a muscle is being stretched, gto send info on strength or force of contraction. Lie parallel to skeletal muscle fibers (extrafusal muscle fibers: activated when muscle is stretched, muscle contraction reduces activation of spindle. Cutaneous receptors tactile sensation sense organs located in most skin areas: touch, pressure, stretch, vibration, temperature, pain free and encapsulated nerve endings: proprioceptros may monitor several different kinds of stimuli (stretch, rate of change, joint position) Kinesthesis: movement perception is teh result of integration of various inputs from sensory modalities in the cns.

Related Questions

It is not possible to see very small objects, such as viruses,using an ordinary light microscope. An electron microscope can viewsuch objects using an electron beam instead of a light beam.Electron microscopy has proved invaluable for investigations ofviruses, cell membranes and subcellular structures, bacterialsurfaces, visual receptors, chloroplasts, and the contractileproperties of muscles. The "lenses" of an electron microscopeconsist of electric and magnetic fields that control the electronbeam.

As an example of the manipulation of an electron beam, consider anelectron traveling away from the origin along the x axis in the xyplane with initial velocity v = vi. As it passes through the regionx = 0 to x = d, the electron experiences acceleration a = ax + ay,where ax and ay are constants. For the case vi = 1.77 107 m/s, ax =7.35 1014 m/s2, and ay = 1.45 1015 m/s2, determine the following,at x = d = 0.0100 m.
(a) the position of the electron
yf =__________ m
(b) the velocity of the electron
vf =________ m/s +__________ m/s
(c) the speed of the electron
|vf| =___________ m/s
(d) the direction of travel of the electron (i.e. the angle betweenits velocity and the x axis)
=________ Â°

It is not possible to see very small objects, such as viruses, using an ordinary light microscope. An electron microscope, however, can view such objects using an electron beam instead of a light beam. Electron microscopy has proved invaluable for investigations of viruses, cell membranes, and subcellular structures, bacterial surfaces, visual receptors, chloroplasts, and the contractile properties of muscles. The “lenses” of an electron microscope consist of electric and magnetic fields that control the electron beam. As an example of the manipulation of an electron beam, consider an electron traveling away from the origin along the x-axis in the XY plane with an initial velocity . As it passes through the region x = 0 to x = d, the electron experiences acceleration where a_x and a_y are constants. For the case v_i = 1.80 × 10⁷ m/s, a_x = 8.00 × 10¹⁴ m/s², and a_y = 1.60 × 10¹⁵ m/s² determine at x = d = 0.010 0 m (a) the position of the electron, (b) the velocity of the electron, (c) the speed of the electron, and (d) the direction of travel of the electron (i.e., the angle between its velocity and the x-axis).