This suggests that our model neurons often fire in bursts with 2 msec delays during a single peak of the network oscillation, contrasting with the main peak ISI of 14 ms msec corresponding to the oscillation period.
For another instance, for every 10-μg /m increase in lag 7 PM2.5, the associated increase in QTcB is only 0.22 msec, corresponding to less than a 1% increase in this variable, which has a mean of 438 msec and SD of 23 msec.
The plots compare the interval between consecutive heart beats in milliseconds on the abscissa (1000 msec interval corresponding to a HR of 60 bpm) to time in seconds on the ordinate axis.
For a particular value of Δ ν Hz we recorded four sequential speckle intensities with the CCD camera (with an exposure time of 40 msec each) each corresponding to phase shifts between the laser diode and US transducer drive signals of 0, π 2, π and 3 π 2 radians.
For the EEG signal, EEG was first down sampled to 1 kHz sampling rate (1 msec bin), and the activity in the [0, 170] msec window from selected trials were similarly concatenated in a long vector, each trial flanked by a 100 msec segment set to a fixed value corresponding to the mean of the EEG signal.
Specifically, for each BF bursting neuron, the spike train was binned at 1 msec, and the binned activity in the [0, 170] msec window from selected trials were concatenated into a long vector, each trial flanked by a 100 msec segment set to a fixed value corresponding to the mean firing rate of this neuron.
The pixel dwell time of the beam was 10 μsec and the eyes were stimulated during 150 frames with the SIM scanner corresponding to a total exposure time of 735 msec during a 9.8 s trial.
Normalized cross correlation (correlation coefficient) was calculated between two concatenated vectors corresponding to BF and EEG activity (described next), between lags [−50, 50] msec at 1 msec resolution.
In order to correct for cerebrospinal fluid (CSF) included within the voxels, we acquired a heavily T2-weighted image with location and slice thickness corresponding to the location of each MRS voxel (FSE; ETL = 8; TE = 500 msec; TR = 3000 msec).
Visual inspection of the tactile ERPs identified positive peaks at ∼50, 100, and 200 msec after tactile stimulus onset near the contralateral somatosensory cortices (at electrodes C3 and C4, according to the international 10 20 system), corresponding to the canonical P50, P100, and P200.
The local field potentials (LFPs) associated with the frontal ERP, concentrated in deep cortical layers corresponding to the zone of BF input, were similarly coupled with BF activity and consistently triggered by BF electrical stimulation within 5 10 msec.
