Highline Medical Center

Compact optically-pumped magnetometers (OPMs) are now commercially available with noise floors reaching 10 fT/Hz1/2. However, to be used effectively for magnetoencephalography (MEG), dense arrays of these sensors are required to operate as an integrated turn-key system. In this study, we present the HEDscan, a 128-sensor OPM MEG system by FieldLine Medical, and evaluate its sensor performance with regard to bandwidth, linearity, and crosstalk. We report results from cross-validation studies with conventional cryogenic MEG, the Magnes 3,600 WH Biomagnetometer by 4-D Neuroimaging. Our results show high signal amplitudes captured by the OPM-MEG system during a standard auditory paradigm, where short tones at 1000 Hz were presented to the left ear of six healthy adult volunteers. We validate these findings through an event-related beamformer analysis, which is in line with existing literature results.

abstractIn the context of our work as literacy specialists, we taught teachers to use sentence frames to support ELL students’ writing. We then studied the impact of their instruction on students. Our analysis of student writing samples revealed no groupwide developmental trends so we posed deeper questions about their work using the data analysis methods learned through the action research process. We report our findings about the relationship between student writing development and language instruction. We discuss our learning as well as implications for our work supporting teacher instruction.