edvard-moser-lecture-slides

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Most (all) network models for grid cells involve continuous attractors... …where • localized firing may be generated by mutual excitation between cells with similar grid phase 2π Grid phase (y) 0 0 Grid phase (x) 2π BRAIN SURFACE: Grid cells arranged according to grid phase (xy positions). Cells with similar fields mutually excite each other. (with an inhibitory surround). • and such activity is translated across the sheet in accordance with the animal’s movement in the environment (e.g. as expressed in speed cells) & speed Samsonovitch &McNaughtn 1997; McNaughton et al. 2006 THIS EXPLAINS LOCALIZED FIRING BUT WHERE DOES THE HEXAGONAL PATTERN COME FROM?
Origin of hexagonal structure Fuhs & Touretzky, 2006; McNaughton et al. 2006; Burak & Fiete, 2009; Couey et al., 2013 Competition between self-exciting blobs with inhibitory surrounds may cause the network to self-organize into a hexagonal pattern, in which distances between blobs are maximized. Similar self-organization may occur with purely inhibitory surrounds (inverted Lincoln hat): (Tor Stensola) Y. Roudi
Page 1 and 2: Nobel Prize in Physiology or Medici
Page 3 and 4: 1959 -: 1971 -: The high end… Sig
Page 5 and 6: CA1 cells continued to express plac
Page 7 and 8: Entorhinal cells had spatial fields
Page 9 and 10: Grid phase (x, y-locations) is dist
Page 11 and 12: Grid phase (x, y-locations) is dist
Page 13 and 14: Grid scale (spacing) follows a dors
Page 15 and 16: The average scale ratio of successi
Page 17 and 18: Grid maps: Scale, orientation and p
Page 19 and 20: 1. Mechanism for geometric alignmen
Page 21 and 22: Grid orientation is determined by t
Page 27 and 28: What is special about 7.5˚? 7.5˚
Page 29 and 30: Elliptification and axis rotation m
Page 31 and 32: Shear forces along the walls cause
Page 33 and 34: Determining the fine-scale function
Page 35 and 36: Hundreds of entorhinal cells can be
Page 37 and 38: Grid cells are distributed but form
Page 43: 3. Mechanism of hexagonal symmetry:
Page 47 and 48: HALF A CENTURY HAS PASSED AND TOLMA
Page 50: A. Wagner

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