2a EyeBrain

Trials 025 probability 020 015 010 005 000 0 1 2 3 4

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Unformatted text preview: ash Friday, 6 September 2013 59 Poisson Probability Distributions Poisson 0.70 (λ = 0 . 5 ) Poisson 0.70 (λ = 1 . 0 ) 0.50 0.40 0.30 0.20 Probability 0.50 0.40 0.30 0.20 0.40 0.30 0.20 0.10 0.10 0.10 0.00 0.00 0.00 0 5 10 15 20 0 Number of Quanta Poisson 0.70 5 10 15 20 0 Number of Quanta (λ = 2 . 0 ) Poisson 0.70 5 10 15 20 Number of Quanta (λ = 5 . 0 ) Poisson 0.70 0.50 0.50 (λ = 1 0 . 0 ) 0.60 0.50 0.40 0.30 0.20 Probability 0.60 Probability 0.60 Probability (λ = 1 . 5 ) 0.60 Probability 0.60 0.50 Probability 0.60 0.40 0.30 0.20 0.40 0.30 0.20 0.10 0.10 0.10 0.00 0.00 0.00 0 5 10 15 Number of Quanta Friday, 6 September 2013 Poisson 0.70 20 0 5 10 15 Number of Quanta 20 0 5 10 15 20 Number of Quanta 60 Poisson Psychometric Functions Poisson P sychometric F unctions Probability of “yes” 1.0 0.8 0.6 0.4 0.2 1 3 2 4 5 6 0.0 0.1 1 10 Mean Number of Quantal Absorptions Friday, 6 September 2013 61 Fit of Data to Theory Probability of “yes” 1.0 0.8 Photopigment absorptions 0.6 Quanta at the cornea 0.4 0.2 1 2 3 4 56 0.0 0.1 1 10 100 Mean Number of Quanta Friday, 6 September 2013 62 Selig H echt 100.0 Chi Square (Goodness of Fit) Chi Square (Goodness of Fit) Fits of Models 10.0 1.0 0 2 4 6 8 10 12 14 16 Simon S hlaer 100.0 10.0 1.0 0 Chi Square (Goodness of Fit) Number of Quanta for Detection 2 4 6 8 10 12 14 16 Number of Quanta for Detection Maurice H enri P irenne 100.0 10.0 0 2 4 6 8 10 12 14 16 Number of Quanta for Detection Friday, 6 September 2013 63 Data from Table V SH1 No. Quanta 8 Chi-Square 2.1862 DF 4 Probability 0.7016 Alpha 1.2475 Quantum Eff 0.0566 Friday, 6 September 2013 SH2 6 1.8612 4 0.7613 1.2813 0.0523 SS1 7 0.9524 4 0.9169 1.1058 0.0784 SS2 10 1.2316 4 0.9729 0.9285 0.1179 MPH 4 4.6696 4 0.3229 1.5253 0.0298 64 Conclusions • You need 4-10 photons to be absorbed by receptors to “see” • Quantum efficiency is between 5 and 10 percent • But…HS&P did not control for the decision process and response bias Friday, 6 September 2013 65 Vision Central Nervous System Friday, 6 September 2013 66 The Human Brain Made by Geoff Boynton, Salk Insitute Friday, 6 September 2013 67 Friday, 6 September 2013 68 Friday, 6 September 2013 69 Human Brain: View from the Rear Friday, 6 September 2013 70 Friday, 6 September 2013 71 V4 MT V3 V3 ST MF = Medial Frontal PP = Posterior Parietal MT = Medial Temporal ST = Superior Temporal V2 V1 IT IT = Inferior Temporal Friday, 6 September 2013 72 Friday, 6 September 2013 73 Friday, 6 September 2013 74 Friday, 6 September 2013 75 Friday, 6 September 2013 76 The Eye and The Brain The End Friday, 6 September 2013 77...
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This note was uploaded on 09/24/2013 for the course PSYC 4165 taught by Professor Harvey,lew during the Fall '08 term at Colorado.

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