Download Exploration of Cortical Function: Imaging and Modeling by M. Stetter PDF

By M. Stetter

Exploration of Cortical Function summarizes contemporary learn efforts aiming on the revelation of cortical inhabitants coding and sign processing suggestions. themes comprise optical detection thoughts of inhabitants task within the sub-millimeter diversity, complicated equipment for the statistical research of those info, and biologically encouraged neuronal modeling recommendations for inhabitants actions within the frameworks of optimum coding, statistical studying idea, and mean-field recurrent networks.

Exploration of Cortical Function is exclusive in that it covers one entire department of population-based mind examine starting from thoughts for info acquisition over facts research as much as modeling thoughts for the quantification of practical rules. the amount covers a space that's of significant present curiosity to researchers engaged on cerebral cortex. the combo of versions and picture research thoughts to ascertain the job of huge cohorts of neurons is principally interesting and at risk of huge mistakes and debate.

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1988). These regions are correlated with the CO-blobs. The size of cortical receptive fields, averaged over all layers, depends strongly on the retinal eccentricity. 17 demonstrates a close relationship between the change in the cortical magnification factor and the receptive field size as a function of retinal eccentricity in the early visual system of macaque monkeys. Actually the inverse magnification factor (dots) and the average receptive field diameter (triangles) are almost perfectly correlated with each other.

If the center contrast is low, contextual effects can change their characteristics. , 1995) report, that iso-orientation suppression turns into facilitation for low center contrast, which is consistent with a fill-in-paradigm. Other studies (Levitt and Lund, 1997) report cross-orientation facilitation to turn into suppression . Contextual effects depend also on the geometrical properties of the stimulus in the non-classical surround. , 1999). In chapter 10, we will address the possible role of iso-orientation modulation for object-based image segmentation.

However, the strength of a synapse is not fixed over time but can vary in an activity-dependent way over various time scales. This class of phenomena is called synaptic plasticity. Because this implies, that the mode of operation of a biological network can change in an activity-dependent manner, synaptic plasticity is believed to underly both fast adaptation processes (Markram and Tsodyks, 1996) and slower learning and memory mechanisms (Bliss and Collingridge, 1993). 2 s up to a few seconds. The measurements shows simultaneous recordings from three neurons in a slice of rat somatosensory cortex, one pyramidal neuron and two different postsynaptic neurons, to which it makes a synaptic contact.

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