Equilibrium%20Point%20Hypothesis%20(EPH) - PowerPoint PPT Presentation

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Equilibrium%20Point%20Hypothesis%20(EPH)

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Title: Hypothesis Testing in an Evolutionary Spino-neuromuscular system Author: LCARS Last modified by: towhidkhah Created Date: 5/1/2005 7:12:01 PM – PowerPoint PPT presentation

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Title: Equilibrium%20Point%20Hypothesis%20(EPH)


1
Equilibrium Point Hypothesis(EPH)
Feldman (1966, 1986, ) ?-Model Bizzi (1978,
1979, ) a- Model
?F0 ?? ???? ?????
2
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3
EPH and Muscle Stiffness
F k ( X X0) ????? ?? ??? (????)
K s (a ) X0 ß (?)
4
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5
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6
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7
Load Effect
ßv Tf - Td/s
8
Evidence for EPH (Polit Bizzi 1978-9)
9
EPH Generalization
10
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11
Questions Unanswered?
1- Role of Motor Centers in the Brain? 2- Motor
Learning? 3- Environmental Effects?
12
Fitts Law Speed-Accuracy Trade-off
13
Fitts Law Speed-Accuracy Trade-off
14
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15
Fitts Law (cont.)
  • MT a b log2 (2A/W)
  • MT Movement Time
  • ID ( Index of Difficulty) A/W
  • log2 Inspired from information theory

16
Fitts Law (cont.)
17
Fitts Law (cont.)
  • Larger limb showed
  • more sensitivity

18
Learning Fitts Law (cont.)Kelso (1984)
  • Slope was reduced to nearly zero following 40,000
    trials.

19
Aging Fitts Law (cont.)Kelso (1984)
  • Aging increases the slope

20
Modification to the Fitts Law
  • MT a (A/W)b
  • Modification effect is minor (10)

21
(No Transcript)
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