Time Course Of Threshold Research Articles

Explaining two-tone suppression and forward masking data using a compressive gammachirp auditory filterbank

The gammatone filter was imported from auditory physiology to provide a time-domain version of the roex auditory filter and enable the development of a realistic auditory filterbank for models of auditory perception. The gammachirp auditory filter was developed to extend the domain of the gammatone auditory filter and simulate the changes in filter shape that occur with changes in stimulus level. Recently, the gammachirp was extended to explain the level-independent frequency glide of the impulse response and a large volume of simultaneous masking data quantitatively. Although this could be implemented with a static filter, we used a time-varying filter whose active component is an IIR asymmetric compensation filter. In this case, it is necessary to estimate the signal level that controls the level dependency, and explain how the level measurement produces the time course of threshold observed in forward masking experiments. In this talk, we propose a new implementation of the time-varying, compressive gammachirp auditory filterbank to explain two-tone suppression and forward masking data qualitatively. We will also show that the system can resynthesize compressed speech sounds and so provide the basis for a gammachirp analysis/synthesis filterbank. [Work supported by GASR(B)(2) No. 15300061, JSPS.]

Three modes of repetitive firing and the role of threshold time course between spikes

When rhythmic firing is elicited in cat spinal motoneurons by long-lasting depolarizing currents, the 'threshold' voltage from which each spike arises may appear to be quite constant (Fig. 1A, arrow). If one probes for the threshold during the interspike interval (ISI), however, it is seen to fall well below this level, rising towards it later in the ISI. Exceptionally large depolarizing afterpotentials may intersect this threshold time course shortly after a spike, causing an extra spike. The extra spike itself may also similarly produce another extra spike; thus a regenerative cycle may produce a burst of spikes at a high firing rate.

Computer-based "kymograph" for photographing raw neurophysiological data.

ArticleComputer-based "kymograph" for photographing raw neurophysiological data.W H CalvinW H CalvinPublished Online:01 Jan 1973https://doi.org/10.1152/jappl.1973.34.1.133MoreSectionsPDF (712 KB)Download PDF ToolsExport citationAdd to favoritesGet permissionsTrack citations ShareShare onFacebookTwitterLinkedInWeChat Previous Back to Top Download PDF FiguresReferencesRelatedInformation Cited ByEctopic action potential generation in peripheral trigeminal axonsExperimental Neurology, Vol. 62, No. 2Three modes of repetitive firing and the role of threshold time course between spikesBrain Research, Vol. 69, No. 2Equivalence of synaptic and injected current in determining the membrane potential trajectory during motoneuron rhythmic firingBrain Research, Vol. 59Human cortical neurons in epileptogenic foci: Comparison of inter-ictal firing patterns to those of “epileptic” neurons in animalsElectroencephalography and Clinical Neurophysiology, Vol. 34, No. 4A Third Mode of Repetitive Firing: Self-Regenerative Firing Due to Large Delayed Depolarizations More from this issue > Volume 34Issue 1January 1973Pages 133-5 https://doi.org/10.1152/jappl.1973.34.1.133PubMed4697373History Published online 1 January 1973 Published in print 1 January 1973 Metrics

Membrane-potential trajectories between spikes underlying motoneuron firing rates.

Membrane-potential trajectories between spikes underlying motoneuron firing rates.

Steps in production of motoneuron spikes during rhythmic firing.

Steps in production of motoneuron spikes during rhythmic firing.

DOUBLE DISCHARGES IN HUMAN MOTOR UNITS

DOUBLE DISCHARGES IN HUMAN MOTOR UNITS