Neural Noise- MEG with frequency-domain beamformer localized activity during complex, PETTLEP-guided motor imagery in elite female ice hockey players (Frontiers in Human Neuroscience).1
- A principal hub during imagery was identified in posterior left hemisphere cortex; method and motor-imagery paradigm are applicable to decoding covert motor intent for BCI.1
- Study sample: 8 elite female ice hockey players (ages 20–26, all right-handed), drawn from the Canadian Women’s Hockey League, Canadian Women’s National Team, NCAA, and U Sports; MEG recorded on a 306-channel Elekta Neuromag TRIUX system.1
- Imagery paradigm used PETTLEP principles (physical, environment, task, timing, learning, emotion, perspective) with a scripted first-person 2-on-1 hockey play; 10 trials × 30 s per condition, alternating with mental counting as active control.1
- Analysis used dynamic imaging of coherent sources (DICS) frequency-domain beamformer at a significant 15–21 Hz beta band (center 18 Hz); statistics via non-parametric cluster-based permutation test (p < 0.01, corrected).1
- The principal activation cluster was located in the left posterior parietal cortex surrounding the intraparietal sulcus — extending into the inferior superior parietal lobule and superior inferior parietal lobule — consistent across 8/8 participants regardless of imagery script differences (including the goaltender).1
- 6/8 participants also showed left and/or right sensorimotor (pre/post-central gyrus) activation; the left-lateralized parietal locus was interpreted as reflecting dynamic visuospatial and multimodal sensorimotor integration rather than simple motor execution imagery.1
- MEG localized activation more discretely than prior PET/fMRI studies, which had additionally identified frontal premotor, supplementary motor, cingulate, caudate, and cerebellar regions — suggesting beamforming resolves motor imagery sources not captured by hemodynamic methods.1
- Authors: Audrey Alice Potts, Luis Garcia Dominguez, David Gold, Mary Pat McAndrews, and Richard Wennberg from the Mitchell Goldhar MEG Unit, Krembil Brain Institute, University Health Network / University of Toronto.1
- BCI relevance: left parietal dominance in complex sport-specific motor imagery provides a target region and frequency band (beta desynchronization) for decoding high-dimensional covert motor intent in BCI paradigms beyond simple limb movements.1