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Geometry of orientation columns in the visual cortex (1979)

Braitenberg, V. ; Braitenberg, C.

Springer

Biological cybernetics 33 (1979), S. 179-186

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ISSN: 1432-0770

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Computer Science , Physics

Notes: Abstract The optimal direction of lines in the visual field to which neurons in the visual cortex respond changes in a regular way when the recording electrode progresses tangentially through the cortex (Hubel and Wiesel, 1962). It is possible to reconstruct the field of orientations from long, sometimes multiple parallel penetrations (Hubel and Wiesel, 1974; Albus, 1975) by assuming that the orientations are arranged radially around centers. A method is developed which makes it possible to define uniquely the position of the centers in the vicinity of the electrode track. They turn out to be spaced at distances of about 0.5 mm and may be tentatively identified with the positions of the giant cells of Meynert.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00337296

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Interpretation of Long-Period Magnetotelluric Soundings In Friuli (North-East Italy) and the Electrical Characteristic of the Lithosphere (1994)

Braitenberg, C. ; Capuano, P. ; Gasparini, P. ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

Geophysical journal international 117 (1994), S. 0

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ISSN: 1365-246X

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Geosciences

Notes: One-year-long records of two magnetotelluric (MT) stations, located in the seismic Friuli region (north-east Italy), were analysed in the 60-28 800s period range. the aim was the investigation of the deep lithospheric electric structure. the computation of the impedances was made by an iterative signal-to-noise enhancing method. Impedances were analysed with complex singular value decomposition (SVD). Some tests were made trying to consider the distortion due to the shallow in-homogeneities. 1-D inversion of the apparent resistivity curves was carried out. the models obtained indicate that the lithosphere thickens from 90 to 120 km westward, in agreement with surface-wave inversion. the westernmost sounding, located in an area of thickened crust, indicates the presence of a ∼10 km thick intracrustal conductor, which may be associated with incipient melting of lower crustal rocks.