Pregled bibliografske jedinice broj: 737441
A neural network model of the functional neuroimaging data on perceptual grouping
A neural network model of the functional neuroimaging data on perceptual grouping // Perception
Lausanne, Švicarska: Pion, 2010. (poster, međunarodna recenzija, sažetak, znanstveni)
CROSBI ID: 737441 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
A neural network model of the functional neuroimaging data on perceptual grouping
Autori
Domijan, Dražen
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Izvornik
Perception
/ - : Pion, 2010
Skup
33th European Conference on Visual Perception
Mjesto i datum
Lausanne, Švicarska, 22.08.2010. - 26.08.2010
Vrsta sudjelovanja
Poster
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
Perceptual grouping; Functional neuroimaging; Neural metwork model
(perceptivno grupiranje; funkcionalno oslikavanje; neuronski model)
Sažetak
A neural network is proposed to explain how different patterns of brain activations arise in functional MRI during viewing of stimuli of various level of complexity. The model implements object-based selection by global inhibition applied to all background spatial locations and local excitation which enable activity spreading along the locations of the figure. It is assumed that excitatory neurotransmission along the dendritic trees provides a major contribution to the blood-oxygen-level-dependent (BOLD) signal. Computer simulations showed that increased perceptual complexity of the stimulus lead to the reduction of BOLD signal in V1. On the other hand, LOC exhibits opposite pattern with strongest BOLD activation for images with 3D interpretation. This pattern of activation is observed when there is no distractors present in the visual field. In the task of collinear contour grouping (with many distracting Gabor patches) both V1 and LOC showed elevated BOLD signal when perceptual group (contour) is present compared to the control condition. Also, the model explicated how attention contributes to the perceptual grouping through differential neural activations in parietal cortex. The proposed model is consistent with the concepts of base and incremental grouping derived from electrophysiological studies.
Izvorni jezik
Engleski
Znanstvena područja
Psihologija
POVEZANOST RADA
Projekti:
009-0362214-0818 - Neuronsko modeliranje i bihevioralno testiranje vidne percepcije i kognicije (Domijan, Dražen, MZOS ) ( CroRIS)
Ustanove:
Filozofski fakultet, Rijeka
Profili:
Dražen Domijan
(autor)