Acoustic processing requires integration over time. We have used in vivo intracellular recording to measure neuronal integration times in anesthetized rats. Using natural sounds and other stimuli, we found that synaptic inputs to auditory cortical neurons showed a rather long context dependence, up to > or =4 s (tau approximately 1 s), even though sound-evoked excitatory and inhibitory conducta...

We have developed a neural network architecture that implements a theory of attention, learning, and trans-cortical communication based on adaptive synchronization of 5-15 Hz and 30-80 Hz oscillations between cortical areas. Here we present a specific higher order cortical model of attentional networks, rhythmic expectancy, and the interaction of hi~her­ order and primar¥, cortical levels of pr...

We have developed a neural network architecture that implements a theory of attention, learning, and trans-cortical communication based on adaptive synchronization of 5-15 Hz and 30-80 Hz oscillations between cortical areas. Here we present a speciic higher order cortical model of attentional networks, rhythmic expectancy, and the interaction of higher-order and primary cortical levels of proce...

An fMRI study of interleaved melody recognition was conducted to examine the neural basis of the bottom-up and top-down mechanisms involved in auditory stream segregation. Hemodynamic activity generated by a mixed sequence was recorded in eight listeners who were asked to recognize a target melody interleaved with distractor tones when the target was presented either before or after the composi...

Sequential stream segregation by normal hearing (NH) and cochlear implant (CI) listeners was investigated using an irregular rhythm detection (IRD) task. Pure tones and narrowband noises of different bandwidths were presented monaurally to older and younger NH listeners via headphones. For CI users, stimuli were delivered as pure tones via soundfield and via direct electrical stimulation. Resul...

This study examines the effects of laterality differences between noise bursts on two objective measures of temporal interval processing gap detection and temporal asymmetry detection, and one subjective measure of temporal organization (stream segregation). Noise bursts were lateralized by presentation to different ears, or dichotic presentation with oppositely-signed interaural level (ILD) or...