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When working with sensor-level data recorded using on-scalp neuroimaging methods such as electroencephalography (EEG), it is common practice to use two-dimensional (2D) representations of sensor positions to aid interpretation. Positioning of sensors relative to anatomy, as in the classic 10-20 system of EEG electrode placement, enables the use of 2D topographies that are familiar to many researchers and clinicians. However, when using another increasingly popular on-scalp neuroimaging method, optically pumped magnetometer-based magnetoencephalography (OP-MEG), bespoke sensor arrays are much more common, and these are not prepared according to any standard principle. Consequently, polar projection is often used to produce individual sensor topographies that are not directly related to anatomy and cannot be averaged across people simply. Given the current proliferation of OP-MEG facilities globally, this issue will become an increasing hindrance when visualising OP-MEG data, particularly for group studies. To address this problem, we adapted and extended the 10-20 system to build a flexible, anatomical projection method applied to digitised head shape, fiducials and sensor positions. We demonstrate that the method maintains spatially veridical representations across individuals improving on standard polar projections at varying OPM sensor array densities. By applying our projection method, the benefits of anatomically veridical 2D topographies can now be enjoyed when visualising data, such as those from OP-MEG, regardless of variation in sensor placement as in sparse or focal arrays.
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http://dx.doi.org/10.1111/ejn.70060 | DOI Listing |
Eur J Neurosci
March 2025
Functional Imaging Laboratory (FIL), Department of Imaging Neuroscience, UCL Queen Square Institute of Neurology, University College London, London, UK.
When working with sensor-level data recorded using on-scalp neuroimaging methods such as electroencephalography (EEG), it is common practice to use two-dimensional (2D) representations of sensor positions to aid interpretation. Positioning of sensors relative to anatomy, as in the classic 10-20 system of EEG electrode placement, enables the use of 2D topographies that are familiar to many researchers and clinicians. However, when using another increasingly popular on-scalp neuroimaging method, optically pumped magnetometer-based magnetoencephalography (OP-MEG), bespoke sensor arrays are much more common, and these are not prepared according to any standard principle.
View Article and Find Full Text PDFFront Med (Lausanne)
June 2023
CIADS Research, Winnipeg, MB, Canada.
Objective: The objective of this study is to determine whether restricted cervical mobility in ankylosing spondylitis (AS) is associated with increased fall frequency or fear of falling.
Methods: A total of 134 AS patients and 199 age- and gender-matched control subjects (CS) with soft-tissue cervicothoracic pain were prospectively evaluated for fall risk. Subjects were divided into non-fallers, single fallers, and multiple fallers.
J Opt Soc Am A Opt Image Sci Vis
September 2022
We propose a series of modifications to the Barten contrast sensitivity function model for peripheral vision based on anatomical and psychophysical studies. These modifications result in a luminance pattern detection model that could quantitatively describe the extent of veridical pattern resolution and the aliasing zone. We evaluated our model against psychophysical measurements in peripheral vision.
View Article and Find Full Text PDFCommun Biol
September 2021
Department of Education and Psychology, Freie Universität Berlin, Berlin, Germany.
Primary visual cortex (V1) in humans is known to represent both veridically perceived external input and internally-generated contents underlying imagery and mental rotation. However, it is unknown how the brain keeps these contents separate thus avoiding a mixture of the perceived and the imagined which could lead to potentially detrimental consequences. Inspired by neuroanatomical studies showing that feedforward and feedback connections in V1 terminate in different cortical layers, we hypothesized that this anatomical compartmentalization underlies functional segregation of external and internally-generated visual contents, respectively.
View Article and Find Full Text PDFJ Exp Child Psychol
March 2021
Department of Experimental Psychology, Faculty of Psychology and Educational Sciences, Ghent University, 9000 Ghent, Belgium.
Whereas we experience our body as a coherent volumetric object, the brain appears to maintain highly fragmented representations of individual body parts. Little is known about how body representations of hand size and shape are built and evolve during infancy and young adulthood. This study aimed to investigate the effect of hand side, handedness, and age on the development of central hand size representation.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!