reaction-time-and-motor-skills

# reaction-time-and-motor-skills - Models of Choice Reaction...

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Models of Choice Reaction Time & Motor Skills Brian P. Bailey

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Announcements omework1 assigned Homework1 assigned Project ideas Group information forms due next week
Recap Questions xplain how LTM can have finite number of Explain how LTM can have finite number of neurons but infinite storage? What is the difference between retroactive and proactive interference? List two things that influence perceptual i? processing?

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Models in HCI xplain or predict observed behavior Explain or predict observed behavior under specific conditions puts outputs and assumptions inputs, outputs, and assumptions accepted model is best explanation to date Desire to “harden” the science of HCI

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Hicks Law ecision time (T) increases with Decision time (T) increases with uncertainty about decision to be made T = a + k*H where H is the entropy of the decision; a and k are constants
Hicks Law = log + 1) if probabilities are equal H = 2 (N + 1) if probabilities are equal H = otherwise = + 1 2 ) 1 / 1 ( log i i i p p One interpretation : people perform binary arch over possible targets search over possible targets

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Model with Hicks Law = a + * og T = a + k log 2 N N = total items to choose from and e coefficients of the regression line a and k are coefficients of the regression line b = menu branching factor (items per menu)

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Model with Hicks Law et’s assume a=0 1 N=64 Let s assume a=0, k=1, N=64 If b = 64: = (log 4)*(log 4) = 6 T= (log 64 64) (log 2 64) = 6 = 8: If b 8: T = (log 8 64)*(log 2 8) = 6 If b = 4: T = (log 4 64)*(log 2 4) = 6
But… onstants not typically a=0 and 1 thus constants not typically a=0 and k=1, thus T = (log b N) * (a + k*log 2 b) T = a*log b N + k*log b N*log 2 b T = a*log b N + k*log 2 N Use largest menus possible subject to ood visual aesthetics good visual aesthetics

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## This note was uploaded on 03/04/2012 for the course CS 465 taught by Professor Karahalios,k during the Fall '08 term at University of Illinois, Urbana Champaign.

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reaction-time-and-motor-skills - Models of Choice Reaction...

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