We consider a model of associative storage and retrieval of compositional memories in an extended cortical network. Our model network is comprised of Potts units, which represent patches of cortex, interacting through long-range connections. The critical assumption is that a memory, for example of a spatial view, is composed of a limited number of items, each of which has a pre-established representation: storing a new memory only involves acquiring the connections, if novel, among the participating items. The model is shown to have a much lower storage capacity than when it stores simple unitary representations. It is also shown that an input from the hippocampus facilitates associative retrieval. When it is absent, it is advantageous to cue rare rather than frequent items. The implications of these results for emerging trends in empirical research are discussed.

Computational constraints on the associative recall of spatial scenes / Ryom, KWANG IL; Stendardi, Debora; Ciaramelli, Elisa; Treves, Alessandro. - In: HIPPOCAMPUS. - ISSN 1098-1063. - 33:5(2023), pp. 635-645. [10.1002/hipo.23511]

Computational constraints on the associative recall of spatial scenes

Kwang Il Ryom;Debora Stendardi;Elisa Ciaramelli;Alessandro Treves
2023-01-01

Abstract

We consider a model of associative storage and retrieval of compositional memories in an extended cortical network. Our model network is comprised of Potts units, which represent patches of cortex, interacting through long-range connections. The critical assumption is that a memory, for example of a spatial view, is composed of a limited number of items, each of which has a pre-established representation: storing a new memory only involves acquiring the connections, if novel, among the participating items. The model is shown to have a much lower storage capacity than when it stores simple unitary representations. It is also shown that an input from the hippocampus facilitates associative retrieval. When it is absent, it is advantageous to cue rare rather than frequent items. The implications of these results for emerging trends in empirical research are discussed.
2023
33
5
635
645
10.1002/hipo.23511
https://www.biorxiv.org/content/10.1101/2022.10.08.511429v1.abstract
Ryom, KWANG IL; Stendardi, Debora; Ciaramelli, Elisa; Treves, Alessandro
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/132310
Citazioni
  • ???jsp.display-item.citation.pmc??? 1
  • Scopus 5
  • ???jsp.display-item.citation.isi??? 4
social impact