منابع مشابه
Gamma-Rhythmic Gain Modulation
Cognition requires the dynamic modulation of effective connectivity, i.e., the modulation of the postsynaptic neuronal response to a given input. If postsynaptic neurons are rhythmically active, this might entail rhythmic gain modulation, such that inputs synchronized to phases of high gain benefit from enhanced effective connectivity. We show that visually induced gamma-band activity in awake ...
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Gain modulation is an important mechanism by which attentional and other inputs modify the amplitude of neuronal responses without changing their selectivity. Gain modulation has been studied previously in feedforward circuits but not in recurrent neural networks. We show how gain modulation modi"es the response of a recurrent network to feedforward inputs. Even modest gain modulation of the re...
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Gain modulation, which is seen in many cortical areas, is a change in the response amplitude of a neuron that is not accompanied by a modification of response selectivity. Just as population coding, in which ensembles of neurons encode information collectively, is a ubiquitous form of neuronal representation, gain modulation appears to be a widespread mechanism of neuronal computation. In parti...
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Attention causes a multiplicative effect on firing rates of cortical neurons without affecting their selectivity (Motter, 1993; McAdams & Maunsell, 1999a) or the relationship between the spike count mean and variance (McAdams & Maunsell, 1999b). We analyzed attentional modulation of the firing rates of 144 neurons in the secondary somatosensory cortex (SII) of two monkeys trained to switch thei...
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We studied the impact of a dynamical threshold on the f-I curve, the relationship between the input and the firing rate of a neuron, in the presence of background synaptic inputs. First, we found that the leaky integrate-andfire model cannot reproduce the f-I curve of a cortical neuron, while the leaky integrate-and-fire model with a dynamical threshold can reproduce it very well. Second, we fo...
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ژورنال
عنوان ژورنال: Neuron
سال: 2000
ISSN: 0896-6273
DOI: 10.1016/s0896-6273(00)00004-0