Browsing by Author "Glantz, Raymon"

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    Information processing during transient responses in the crayfish visual system
    (2003-06-01) Rozell, Chris; Johnson, Don; Glantz, Raymon; Digital Signal Processing (http://dsp.rice.edu/)
    We analyzed sustaining fiber responses in the crayfish visual system to light pulses using information processing techniques. The light pulse stimuli elicited a transient and a steady-state component in the EPSP input and in the firing rate of the spike train output. The overall information transfer of the system was very low (10-4), with a sharp increase during the transient portion of the response followed by a steady decrease. The change in the information transfer rate is related to the difference in communication rates possible in spike trains with varying rates. This analysis corroborates the observed light reflex behavior.
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    When does interval coding occur?
    (2003-07-20) Johnson, Don; Glantz, Raymon; Digital Signal Processing (http://dsp.rice.edu/)
    During the stationary portion of neuron's spiking response to a stimulus, the stimulus could be coded in the average rate and, more elaborately, in the statistics of the sequence of interspike intervals. We use information processing theory to explicitly define when interval coding occurs and quantify the coding gain beyond rate coding provided by the interval code. We explicitly find the interval distribution commensurate with average rate coding. When we analyzed optomotor neural responses recorded from the crayfish eye, we found little interval coding occuring despite stimulus-induced changes from a unimodal to a bimodal interval distribution.