Neuroscience 22:841–847īressler SL, Freeman WJ (1980) Frequency analysis of olfactory system EEG in cat, rabbit and rat. Springer, Berlin Heidelberg New York, pp 183–200īauer R, Fischer WH (1987) Continuity or incontinuity of orientation columns in visual cortex: a critical evaluation of published and unpublished data. In: Başar E, Flohr H, Haken H, Mandell AJ (eds) Synergetics of the brain. Vision Res 26:1949–1957īaşar E (1983) Synergetics of neural populations. Springer, Berlin Heidelberg New York, pp 7–24Īltmann L, Eckhorn R, Singer W (1986) Temporal integration in the visual system: influence of temporal dispersion on figureground discrimination. In: Palm G, Aertsen A (eds) Brain theory. Visually related activities are, thus, transiently labelled by a temporal code that signalizes their momentary association.Īertsen A, Gerstein G, Johannesma P (1986) From neuron to assembly: neuronal organization and stimulus representation. We assume that the coherence of SE-resonances is mediated by recurrent excitatory intra- and inter-areal connections via phase locking between assemblies that represent the linking features of the actual visual scene. Coherence was found 1) within a vertical cortex column, 2) between neighbouring hypercolumns, and 3) between two different cortical areas. Coherent SE-resonances were found at distant cortical positions when at least one of the primary coding properties was similar. Stimulus position, orientation, movement direction and velocity, ocularity and stationary flicker caused specific SE-resonances. Stimulusevoked (SE)-resonances of 35–85 Hz were found in these three types of signals throughout the visual cortex when the primary coding channels were activated by their specific stimuli. Single and multiple spikes as well as local field potentials were recorded simultaneously from several locations in the primary visual cortex (A17 and A18) using 7 or 19 individually advanceable fibermicroelectrodes (250 or 330 μm apart). We tested the neurophysiological relevance of this hypothesis for the visual system. In recent models of visual coding, oscillatory activities have been proposed to constitute such linking signals. Subject of this paper is our search for a global, second coding step beyond the RF-concept that links related features in a visual scene. Primary visual coding can be characterized by the receptive field (RF) properties of single neurons.
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