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Pregled bibliografske jedinice broj: 552536

A computational model of fMRI activity in the intraparietal sulcus that supports visual working memory


Domijan, Dražen
A computational model of fMRI activity in the intraparietal sulcus that supports visual working memory // Cognitive affective & behavioral neuroscience, 11 (2011), 4; 1-27 doi:10.3758/s13415-011-0054-x (međunarodna recenzija, članak, znanstveni)


Naslov
A computational model of fMRI activity in the intraparietal sulcus that supports visual working memory

Autori
Domijan, Dražen

Izvornik
Cognitive affective & behavioral neuroscience (1530-7026) 11 (2011), 4; 1-27

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Computational model; Neural network; Dendrites; Functional neuroimaging; Computational model; Parietal cortex; Working memory

Sažetak
A computational model was developed to explain a pattern of results of fMRI activation in the intraparietal sulcus (IPS) supporting visual working memory for multiobject scenes. The model is based on the hypothesis that dendrites of excitatory neurons are major computational elements in the cortical circuit. Dendrites enable formation of a competitive queue that exhibits a gradient of activity values for nodes encoding different objects, and this pattern is stored in working memory. In the model, brain imaging data are interpreted as a consequence of blood flow arising from dendritic processing. Computer simulations showed that the model successfully simulates data showing the involvement of inferior IPS in object individuation and spatial grouping through representation of objects’ locations in space, along with the involvement of superior IPS in object identification through representation of a set of objects’ features. The model exhibits a capacity limit due to the limited dynamic range for nodes and the operation of lateral inhibition among them. The capacity limit is fixed in the inferior IPS regardless of the objects’ complexity, due to the normalization of lateral inhibition, and variable in the superior IPS, due to the different encoding demands for simple and complex shapes. Systematic variation in the strength of self-excitation enables an understanding of the individual differences in working memory capacity. The model offers several testable predictions regarding the neural basis of visual working memory.

Izvorni jezik
Engleski

Znanstvena područja
Psihologija



POVEZANOST RADA


Projekt / tema
009-0362214-0818 - Neuronsko modeliranje i bihevioralno testiranje vidne percepcije i kognicije (Dražen Domijan, )

Ustanove
Filozofski fakultet, Rijeka

Autor s matičnim brojem:
Dražen Domijan, (222473)

Časopis indeksira:


  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus
  • MEDLINE


Uključenost u ostale bibliografske baze podataka:


  • BIOSIS Previews (Biological Abstracts)
  • MEDLINE
  • PsychINFO


Citati