dorsal/arxiv
View SchemaAutoassociative Memory Retrieval and Spontaneous Activity Bumps in Small-World Networks of Integrate-and-Fire Neurons
| Authors | A. Anishchenko, E. Bienenstock, A. Treves |
|---|---|
| Categories | |
| ArXiv ID | q-bio/0502003 |
| URL | https://arxiv.org/abs/q-bio/0502003 |
Abstract
Qualitatively, some real networks in the brain could be characterized as 'small worlds', in the sense that the structure of their connections is intermediate between the extremes of an orderly geometric arrangement and of a geometry-independent random mesh. Small worlds can be defined more precisely in terms of their mean path length and clustering coefficient; but is such a precise description useful to better understand how the type of connectivity affects memory retrieval? We have simulated an autoassociative memory network of integrate-and-fire units, positioned on a ring, with the network connectivity varied parametrically between ordered and random. We find that the network retrieves when the connectivity is close to random, and displays the characteristic behavior of ordered nets (localized 'bumps' of activity) when the connectivity is close to ordered. Recent analytical work shows that these two behaviours can coexist in a network of simple threshold-linear units, leading to localized retrieval states. We find that they tend to be mutually exclusive behaviours, however, with our integrate-and-fire units. Moreover, the transition between the two occurs for values of the connectivity parameter which are not simply related to the notion of small worlds.
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"abstract": "Qualitatively, some real networks in the brain could be characterized as\n\u0027small worlds\u0027, in the sense that the structure of their connections is\nintermediate between the extremes of an orderly geometric arrangement and of a\ngeometry-independent random mesh. Small worlds can be defined more precisely in\nterms of their mean path length and clustering coefficient; but is such a\nprecise description useful to better understand how the type of connectivity\naffects memory retrieval?\n We have simulated an autoassociative memory network of integrate-and-fire\nunits, positioned on a ring, with the network connectivity varied\nparametrically between ordered and random. We find that the network retrieves\nwhen the connectivity is close to random, and displays the characteristic\nbehavior of ordered nets (localized \u0027bumps\u0027 of activity) when the connectivity\nis close to ordered. Recent analytical work shows that these two behaviours can\ncoexist in a network of simple threshold-linear units, leading to localized\nretrieval states. We find that they tend to be mutually exclusive behaviours,\nhowever, with our integrate-and-fire units. Moreover, the transition between\nthe two occurs for values of the connectivity parameter which are not simply\nrelated to the notion of small worlds.",
"arxiv_id": "q-bio/0502003",
"authors": [
"A. Anishchenko",
"E. Bienenstock",
"A. Treves"
],
"categories": [
"q-bio.NC"
],
"title": "Autoassociative Memory Retrieval and Spontaneous Activity Bumps in Small-World Networks of Integrate-and-Fire Neurons",
"url": "https://arxiv.org/abs/q-bio/0502003"
},
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