Resting and postural tremor, intention and action tremor, clonus and the cogwheel phenomenon in Parkinson's disease have been characterised in terms of frequency content using spectral analysis. Typical resting tremor ranged in peak frequency from 4 to 5.3 HZ with tremor in each individual varying only by 0.2 to 0.3 HZ. The peak frequency of postural tremor ranged between 6 and 6.2 HZ. Intentio...

Recent observations of the low–mass X–ray binary 4U 1636–53 with the Rossi X– ray Timing Explorer show, for the first time, a kiloHertz quasi–periodic oscillation (kHz QPO) peak separation that exceeds the neutron star spin frequency as inferred from burst oscillations. This strongly challenges the sonic–point beat frequency model for the kHz QPOs found in low–mass X–ray binaries. We detect two...

Flickering 560-nm light appears brighter and less saturated than steady light of the same average intensity. The changes in appearance are consistent with the visual signal's being distorted at some nonlinear site (or sites) within the visual pathway at which new temporal components, not part of the original waveform, are produced. By varying the input stimulus to manipulate these new temporal ...

Quasistatic nanoindentation is a proven tool that provides information on the micromechanical behavior of wood cell walls. However, quasistatic tests cannot probe time-dependent mechanical shown by wood. Nanoindentation dynamic analysis (nanoDMA) can measure viscoelastic properties This research aimed to study and individual radiata pine (Pinus D. Don) wall layers. To minimize variability retri...

Brown ghost knife fish (Apteronotus leptorhynchus) can briefly increase their electric organ discharge (EOD) frequency to produce electrocommunication signals termed chirps. The chirp rate increases when fish are presented with conspecific fish or high-frequency (700-1100 Hz) electric signals that mimic conspecific fish. We examined whether A. leptorhynchus also chirps in response to artificial...

EEG recordings reflect the gross electrical activity emanating from synaptic currents of individual neurons across large cortical areas. During periods of cortical activation, waking, and higher EEG frequencies, neurons display increased excitability and exhibit more asynchronous discharge. The activity of a number of subcortical neurotransmitter systems from several brain regions outside the t...

Recent observations of the low–mass X–ray binary 4U 1636–53 with the Rossi X– ray Timing Explorer show, for the first time, a kiloHertz quasi–periodic oscillation (kHz QPO) peak separation that exceeds the neutron star spin frequency as inferred from burst oscillations. This strongly challenges the sonic–point beat frequency model for the kHz QPOs found in low–mass X–ray binaries. We detect two...

background and aim: human beings receive a variety of sounds in their everyday lives. these sounds are generated by different sources, and are heard simultaneously or with a small time sequence. a characteristic of the auditory system is its ability to analyze complex sounds, and to make decisions about the source of each constituent part of these sounds. the present study intends to assess nor...

background and aim: the normal response of h-reflex depression (hd) was reduced in chronic spinal cord injury (sci) patients. the reduction of this normal response can lead to increase the muscle tone and spasticity. the purpose of this study is to investigate the effect of tripolar cathodal stimulation on hd in sci patients.   materials and methods: this study was conducted in 10 volunteered s...

studies show that any complications including hemorrhage, lack of blood supply, lack of oxygen supply, and death of cells in a tissue, will have a clear effect on electrical properties of that tissue. thus, by measuring impedance of a set of tissues, potential problems of the damaged tissue may be found. since electrical impedance is closely related to the measuring frequency, obviously, every ...