This optimal step-size depends on the time varying complex gain model.
The channel gain model on each subcarrier considers free space path loss and multipath Rayleigh fading [4].
Then, the complex path gain model of the deterministic multipath channel between the reader and the tag is given by [8].
For each trial, we estimate the link gain model parameters via (2), and then substitute them into (1) to obtain the set of link gain estimates, say.
For instance, the feature similarity gain model, proposed by Treue and Martinez-Trujillo (1999), states that neuronal responses are enhanced for all neurons whose sensory selectivity matches the current attentional state.
Our results suggest that auditory selective attention in humans cannot be explained by a gain model, where only the neural activity level is increased, but rather that selective attention additionally enhances auditory cortex frequency selectivity.
During the selective attention conditions, the suppressant effect of the noise notch width on GFP was decreased, but as a function significantly different from a multiplicative one expected on the basis of simple gain model of selective attention.
The current experiment shows that auditory selective attention in humans cannot be explained by a gain model, where only the neural activity level is increased, but rather that selective attention additionally enhances auditory cortex frequency selectivity.
The response gain model, in turn, gave a better fit to the data than the contrast gain model (P = 0.0098, rank sum test).
This implies that the activity gain model cannot give a better account of our data than the response gain model, and we thus did not consider it further.
Previous studies gave conflicting results on how attention influences contrast response functions, with some studies supporting the contrast gain model and others supporting the response gain model.
