Received 15 January 2007; revised 4 February 2008; accepted 7 February 2008 A melodic pitch experiment was performed to demonstrate the importance of time-interval resolution for pitch strength. The experiments show that notes with a low fundamental 75 Hz and relatively few resolved harmonics support better performance than comparable notes with a higher fundamental 300 Hz and more resolved har...

BACKGROUND Slow Wave Activity (SWA), the low frequency (<4 Hz) oscillations that characterize Slow Wave Sleep (SWS) are thought to relate causally to declarative memory consolidation during nocturnal sleep. Evidence is conflicting relating SWA to memory consolidation during nap however. OBJECTIVE/HYPOTHESIS We applied transcranial alternating current stimulation (tACS) - which, with a cross-h...

Power spectral analysis of electrocardiogram (ECG) R-R intervals is useful for the detection of autonomic dysfunction in various clinical disorders. Although both panic disorder (PD) and major depressive disorder (MDD) are known to have effects on the cardiac autonomic nervous system, no previous study has tested this among drug-naïve (i.e. no history of treatment) patients with MDD and PD in t...

Age-related cognitive and behavioral slowing may be caused by changes in the speed of neural signaling or by changes in the number of signaling steps necessary to achieve a given function. In the mammalian cortex, neural communication is organized by a 30-100 Hz "gamma" oscillation. There is a putative link between the gamma frequency and the speed of processing in a neural network: the dynamic...

CONTEXT Electrically induced muscle cramps (EIMC) do not last long enough to study many cramp treatments. Increasing stimulation frequency lengthens cramp duration; it is unknown which frequency elicits the longest EIMC. OBJECTIVE To determine which stimulation frequency elicits the longest EIMC and whether cramp duration and stimulation frequency are correlated. DESIGN Randomized, crossove...

1. In patients with chronic heart failure, heart rate variability is reduced with relative preservation of very-low-frequency power (< 0.04 Hz). Heart rate variability has been measured without acceptable information on its stability and the optimal recording periods for enhancing this reproducibility. 2. To this aim and to establish the optimal length of recording for the evaluation of the ver...

Auditory brainstem (ABR) and middle latency responses (MLR) were recorded for ten normal subjects. Changes in wave latency were recorded with high- and low-pass filtering using Butterworth filters with standard phase-shift characteristics. When an open filter (15-3,000 HZ) was used, waves IV, V and VI of the ABR were superimposed on wave P phi of the MLR. A positive (P) wave was recorded in the...

The 2003 X-ray outburst of the candidate black-hole binary, H1743–322, was investigated in frequent pointed observations (2–250 keV) with the Rossi X-ray Timing Explorer. We consider one particular program of 130 observations. We organized these data into 111 time intervals and conducted a search for the presence of high-frequency quasiperiodic oscillations (HFQPOs) in the range 50–2000 Hz. Onl...

BACKGROUND The prognostic implications of alterations in heart rate variability have not been studied in a large community-based population. METHODS AND RESULTS The first 2 hours of ambulatory ECG recordings obtained on original subjects of the Framingham Heart Study attending the 18th biennial examination were reprocessed to assess heart rate variability. Subjects with transient or persisten...

Aperiodic high-frequency oscillations (>100 Hz) reflect a short-term synchronization of neuronal electrical activity. It has been shown in the epileptic brain that spontaneous oscillations in the frequency range of 250-600 Hz reflect action potential population bursts of synchronously discharging neuronal clusters. These oscillations occur in the early stages of epileptogenesis in areas adjacen...