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Kinesiology 1080A/B
Matthew Heath

Kin 1080 – Mar. 1, 2013 Blurry Heart Illusion  The brain is trying to define the edge of the blurry heart; bunch of neurons are active because the edge is not defined so many different neurons are telling us where the edge could be  We have neurons in our primary visual cortex that are firing and telling us that this is the edge of the object; if the edge is clear and defined, only a certain set of neurons are active  For the blurry heart, there is no clear defined edge, so whole bunch of neurons that are active thinking that the edge is at different position; this gives off the vision that the heart is beating  Resolution is important in detecting edges = greater resolution means greater ability to detect edge Movement Kinematics Displacement  displace/time = velocity Velocity  provides us with a rate of change with respect to time; how fast an object moves; velocity/time = acceleration Acceleration  change of velocity of an object during movement Kinematics of a Reaching Movement  Left image = simple point movements at different displacements  Displacement of human limb is not linear; we move in a slight curve linear pattern  Moving in a linear pattern does not optimize efficiency & effectiveness of movement  We move in a curve pattern so our hand does not block our visual field; better visual control (optimized effectiveness  Bottom right image = displays velocities of the displacements  Normal distribution; it is slightly positively skewed; right hand side is slightly longer  In order to be a smooth movement, it has to be bell shaped velocity profile  Ballistic movement  it happens very fast (programmed fast) and because it happened fast it cannot be regulated by feedback structures  Can’t use vision to modify the movement  As you reach peak velocity, the movement starts to slow down and at this time you can use feedback (haptic information) to modify your movement  When you requirement feedback to modify movement, you require processes time and time after velocity is slightly longer than your time upto peak velocity  Time up to peak velocity = ballistic  The peak of the velocity scales with the amplitude of the response; the further you move, the higher the peak velocity is going to be;  People who have perpetual disorder  having a problem predicting the distance  Acceleration  They are generally smooth acceleration profiles = optimized movement (CNS is intacted) Patient MR - Patient MR has a very big lesion involving left parietal lobe - Severe t
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