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Pregled bibliografske jedinice broj: 327236

Poglavlje/Rad u knjizi

Autori: Šetić, Mia; Domijan, Dražen
Naslov: A Model for Computing Average Size and Speed of Visual Objects
Knjiga: 15th Psychology Days in Zadar. Book of Selected Proceedings
Urednik/ci: Ćubela Adorić ; Vera
Izdavač: University of Zadar
Grad: Zadar
Godina: 2007
Raspon stranica:: 360-369
Ukupni broj stranica u knjizi:: 430
ISBN: 978-953-7237-21-9
Ključne riječi: Dendritic computation, Number, Presynaptic inhibition, Space, Statistical processing
Sažetak:
Human visual system is able to form overall statistical representation of a visual field by computing average value of several perceptual attributes such as size and speed. We proposed a neural model that computes the mean size and the mean speed of a set of similar objects. The model is a feedforward, two-dimensional neural network with three layers. Computer simulations illustrated the model’ s ability to compute the mean size independently from the visual appearance of objects. This is achieved in a fast, parallel manner without serial scanning of the visual field. The mean size is computed indirectly by comparing the total activity in the input layer and in the third layer. With the assumption that moving objects leave a trace of neural activity along the trajectory they traverse, the model is easily extended to the computation of average speed of a set of moving objects. The problem of speed estimation is reduced to the problem of size estimation of the neural trace. Therefore, both types of computations are explained using the common neural architecture. The model utilised several biophysically plausible mechanisms such as dendritic multiplication, gradient synaptic weights and lateral inhibition.
Projekt / tema: 009-0362214-0818
Izvorni jezik: ENG
Kategorija: Znanstveni
Znanstvena područja:
Psihologija
Upisao u CROSBI: Dražen Domijan (ddomijan@ffri.hr), 1. Tra. 2008. u 17:25 sati



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