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Material Type: Assignment; Class: FIRST-YEAR INTEREST GROUP SMNR; Subject: Nursing; University: University of Texas - Austin; Term: Spring 2009;
Typology: Assignments
1 / 2
Perceptual Systems
Assignment 3 Due Thursday, April 2, 2009
(a) Suppose that the strips are uniformly illuminated with a light that this 150 photons/sec on each strip. What would be the intensity in photons/sec coming off the strips?
(b) Sketch the intensity distribution of the light reflected from the strips:
c) Sketch the approximate response distribution from the ganglion cells produced by this intensity distribution:
Spatial position
Response (spikes/sec)
Spatial position
Intensity (photons/sec)
a) contrast = 0.1, mean luminance = 10 b) contrast = 0.5, mean luminance = 100 c) contrast = 1.0, mean luminance = 10 d) contrast = 1.0, mean luminance = 100 e) contrast = 0.05, mean luminance = 100
50
n n n
r c r c c c
has been used to described the shape of the contrast response function of cortical neurons. Using Excel, plot this function (sometimes known as the Naka-Rushton function or the Michaelis-Menton function) for the following values of the parameters:
a. r max = 10, c 50 (^) = 20 , n = 1 b. r max = 10, c 50 (^) = 20 , n = 2 c. r max = 10, c 50 (^) = 50 , n = 2 d. r max = 5, c 50 (^) = 20 , n = 2