Journal: bioRxiv

Article Title: Neural correlates of pure presence

doi: 10.1101/2024.04.18.590081

Figure Lengend Snippet: Experimental design. 256-electrode HDEEG was recorded during PP and compared to a variety of non-PP states: within-meditation mind-wandering (A), resting eyes open (B) and eyes closed (C), watching a movie (D), imagining the same movie (E), active thinking (counting backwards, F), open-monitoring (G).

Article Snippet: Once they arrived at the sleep lab, we applied a 256 HdEEG net (Electrical Geodesics, Inc., Eugene, Ore.) for sleep recordings and additional submental electromyogram and electrooculogram to perform sleep staging using Alice ® Sleepware (Philips Respironics, Murrysville, PA) Throughout the night, they were awakened repeatedly ( ) and asked to report whether, just before the awakening, they had been experiencing anything (DE), had been experiencing something but could not remember the content [DE without recall of content (DEWR)] or had not been experiencing anything [no experience (NE); ( )].

Techniques:

Journal: Cognitive, affective & behavioral neuroscience

Article Title: Electrophysiological correlates of encoding processes in a full-report visual working memory paradigm

doi: 10.3758/s13415-018-0574-8

Figure Lengend Snippet: VWM task design and SSVEP frequency tagging technique. (A) An example trial sequence for the full-report paradigm tested. During fixation, four black squares were presented in each quadrant (600 ms) and followed by an encoding period (1000 ms). During encoding, each stimulus flickered at a unique frequency (3 Hz, 5 Hz, 12 Hz, and 20 Hz) placed one per quadrant. Next, a maintenance period (1000 ms) was followed by retrieval. There were two retrieval task types: (i) simultaneous and (ii) sequential. During simultaneous recall, participants were instructed to choose and place the four encoded polygons in the location that they remembered. During sequential recall, participants were randomly designated one location at a time to place each polygon. After the participant placed the shape, the bounding black square turned green to indicate that the choice had been registered and a new black square appeared at another location. In both recall tasks, all the selected shapes remained visible within the bounding box until the conclusion of the trial. Responses were unspeeded. (B) During encoding, hdEEG data was collected (artificial waveform data). (C) Individual trials were sorted by accuracy: the number of correct trials for each frequency was matched with the number of incorrect trials. A fast Fourier transform was applied to the raw electrical signal, averaged across electrodes, and individual component frequency amplitudes were extracted from the FFT data corresponding to the flicker frequency of each stimuli for both correct and incorrect trials. The data presented here are hypothesized and are not actual results.

Article Snippet: 2.6 Electrophysiological data analysis 2.6.1 Preprocessing The hdEEG data were processed and analyzed using a combination of functions from the Net Station 5.0 software package (Electrical Geodesics, Inc., Eugene, OR, USA), Brainstorm software package ( Tadel et al. 2011 : http://neuroimage.usc.edu/brainstorm ), and custom-made Matlab scripts.

Techniques: Sequencing

Journal: NeuroImage

Article Title: A simple sleep EEG marker in childhood predicts brain myelin 3.5 years later

doi: 10.1016/j.neuroimage.2019.05.072

Figure Lengend Snippet: A. Assessment. Children completed sleep high-density EEG (hdEEG) at the Baseline (T1) assessment and sleep hdEEG and Magnetic Resonance Imaging (MRI) 3.5y later at follow-Up (T2). Each subject is represented with a different color: 13 subjects were assessed twice (one subject entered the study at T2). B. Frontal/Occipital (F/O)-ratio. Slow wave activity (0.5-4.5 Hz, first 60 min of NREM sleep) within a cluster of 5 electrodes in the frontal region averaged and divided by the value of 5 averaged occipital electrodes. Clusters of electrodes are illustrated with colors, i.e., channels 10, 11 (Fz), 15, 16, 18 in the frontal cluster and 71, 74, 75 (Oz), 76, 82 in the occipital cluster (Electrical Geodesics Inc., 128-channel Sensor Net).

Article Snippet: All-night hdEEG assessments were scheduled according to habitual bedtimes (128 channels, Electrical Geodesics Inc., Sensor Net, Portable System, Eugene, Oregon, US).

Techniques: Magnetic Resonance Imaging, Activity Assay