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2 Publications

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    10/14/14 | Word length effect in free recall of randomly assembled word lists.
    Katkov M, Romani S, Tsodyks M
    Frontiers in Computational Neuroscience. 2014 Oct 14;8:129. doi: 10.3389/fncom.2014.00129

    In serial recall experiments, human subjects are requested to retrieve a list of words in the same order as they were presented. In a classical study, participants were reported to recall more words from study lists composed of short words compared to lists of long words, the word length effect. The world length effect was also observed in free recall experiments, where subjects can retrieve the words in any order. Here we analyzed a large dataset from free recall experiments of unrelated words, where short and long words were randomly mixed, and found a seemingly opposite effect: long words are recalled better than the short ones. We show that our recently proposed mechanism of associative retrieval can explain both these observations. Moreover, the direction of the effect depends solely on the way study lists are composed.

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    04/17/14 | Continuous attractor network model for conjunctive position-by-velocity tuning of grid cells.
    Si B, Romani S, Tsodyks M
    PLoS Computational Biology. 2014 Apr 17;10(4):e1003558. doi: 10.1371/journal.pcbi.1003558

    The spatial responses of many of the cells recorded in layer II of rodent medial entorhinal cortex (MEC) show a triangular grid pattern, which appears to provide an accurate population code for animal spatial position. In layer III, V and VI of the rat MEC, grid cells are also selective to head-direction and are modulated by the speed of the animal. Several putative mechanisms of grid-like maps were proposed, including attractor network dynamics, interactions with theta oscillations or single-unit mechanisms such as firing rate adaptation. In this paper, we present a new attractor network model that accounts for the conjunctive position-by-velocity selectivity of grid cells. Our network model is able to perform robust path integration even when the recurrent connections are subject to random perturbations.

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