![]() We also find that attention reduces the variability of individual neuron's responses, as measured by the Fano Factor. ![]() Consistent with our pairwise spike count analysis, we observe a significant attention-dependent reduction in spike-LFP coherence at low frequencies. ![]() We also examined this low frequency noise reduction by computing the coherence of spiking with local field potentials (LFPs). The dominant source of noise contributing to the variability in spiking is best characterized as ‘1/f‘ low frequency noise, as seen in the spike power spectrum of single units. After controlling for correlations induced by the stimulus we find that trial-by-trial spike count correlations are reduced when attention is directed to the stimulus. We measured correlations in the neurons‘ responses when the stimulus was either attended or ignored. To examine this we recorded from pairs of neurons in visual area V4 as monkeys performed an attention-demanding object tracking task that placed a preferred stimulus inside the overlapping region of the two neurons‘ receptive fields. Attention might improve sensory processing by reducing correlations in the responses evoked by an attended stimulus. Correlated firing among sensory neurons limits the accuracy with which sensory information can be decoded from neuronal populations (Zohary et.
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