Mri compatible physiological monitoring system

Skin conductance response (SCR) data were collected using an MRI compatible physiological monitoring system (Biopac Systems; Goleta, CA) using the basic methodology described in prior work (Knight & Wood, 2011 ). SCR was sampled at 10 kHz with a pair of disposable radio-translucent electrodes (1 mm diameter, Biopac Systems; Goleta, CA) located on the thenar and hypothenar eminence of the non-dominant hand. SCR data were low pass filtered at 1Hz and downsampled to 250 Hz using Acqknowledge 4.1.0 software. The downsampled SCR were analyzed with SCRalyze toolbox (version b2.1.8) (Bach, Flandin, Friston, & Dolan, 2009 (link)). The data were then bandpass filtered with a first order Butterworth filter (highpass cutoff of 0.0159 Hz, lowpass filter of 1.0 Hz), downsampled to a 10 Hz sampling rate, and the time-series was normalized (z-transformed and mean centered). SCRs to math events were estimated using the general linear model with an assumed SCR function without a time or dispersion derivative.

An MRI compatible physiological monitoring system (Biopac Systems; Goleta, CA) was used to collect SCR data. SCR was sampled (10 kHz) with a pair of disposable radio-translucent electrodes (1 cm diameter, Biopac Systems; Goleta, CA) from the thenar and hypothenar eminences of the nondominant hand. SCR data were processed using Biopac AcqKnowledge 4.1 software. A 1 Hz low pass digital filter was applied and SCR data were resampled at 250 Hz. Conditioned SCRs were assessed from the phasic increase in conductance during the 10 s CS presentation. Responses smaller than 0.05 μS were assigned a value of zero. SCR data were square-root transformed prior to statistical analyses. SCR data for two TE participants were not collected due to injuries (e.g., burn) that prevented the use of psychophysiological monitoring sensors. Thus, 18 TE participants were used in group-level SCR data analyses.

An MRI compatible physiological monitoring system (Biopac Systems; Goleta, CA) was used to collect SCR data. SCR was sampled (10 kHz) with a pair of disposable radio-translucent electrodes (1 cm diameter, Biopac Systems; Goleta, CA) from the thenar and hypothenar eminences of the nondominant hand. SCR data were processed using Biopac AcqKnowledge 4.1 software. A 1 Hz low pass digital filter was applied and SCR data were resampled at 250 Hz. Conditioned SCRs were assessed from the phasic increase in conductance during the 8 s preceding UCS presentation. SCRs were calculated using procedures adapted from previous guidelines (Roth, Dawson, and Filion, 2012 (link)). Specifically, conditioned SCRs were calculated during the 8 s immediately preceding UCS presentation by subtracting the skin conductance signal at response onset from the peak skin conductance value. Trials in which an unconditioned SCR was elicited during the 8 s window prior to a subsequent UCS presentation were excluded from the analysis. Responses smaller than 0.05 μSiemens were assigned a value of zero.