Arithmetic in Philo Judaeus by Frank Egleston Robbins
By Frank Egleston Robbins
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The impulse also backspreads into secondary dendrites (4), where it activates output synapses that are excitatory to spines of granule cell dendrites (5). The EPSP in the spine then activates a reciprocal inhibitory synapse back into the mitral cell dendrite (6); the IPSP spreads through the neuron to inhibit further impulse output. Reciprocal synapses thus form an effective microcircuit module carrying out an elementary computation—in this case, recurrent inhibitory feedback of an activated neuron.
It can also be mediated by the canonical dendrodendritic pathway through an interneuron, as described in Fig. 5. In summary, the spatial organization of receptive fields can be implemented by several types of canonical circuits; the resulting receptive fields can subserve processing of information in different modalities. Temporal Contrast. Just as there is enhancement of spatial contrast between the activities of populations of cells, so is there enhancement of temporal contrast between successive activity states.
This illustrates an important concept, that similar functions can be mediated by different neural substrates. Conversely, similar substrates can mediate different functions, by specific adaptations of general mechanisms. In summary, three canonical mechanisms (membrane channels, circuits involving axon collaterals, and circuits involving dendritic interactions) can generate the same canonical operation: oscillatory activity. Conversely, each of these canonical mechanisms can potentially be refined to generate different oscillatory frequencies.