Abstract:Speech imagery is an attractive brain-computer interface paradigm for communication because it is endogenous and intrinsically linguistic. Yet despite growing interest, its dominant scalp-EEG spatiotemporal characteristics remain poorly characterized. We investigated whether speech imagery, understood here as the motor imagery of articulatory movements, exhibits the motor-related mu/alpha and beta desynchronization expected from motor imagery. In $34$ participants, we compared speech imagery, finger motor imagery, and explicitly cued no-task trials recorded under the same trial structure, analyzing band-power dynamics across channels and time. Finger motor imagery showed the expected contralateral mu/alpha and beta desynchronization over sensorimotor areas, whereas speech imagery showed a weaker, more distributed increase in alpha power relative to no-task. A classifier discriminating imagery from no-task reached mean balanced accuracies of $0.563 \pm 0.071$ for speech imagery and $0.717 \pm 0.125$ for motor imagery, with band-ablation analyses showing larger, more robust alpha and beta effects for motor imagery. These results show that the dominant group-level scalp response to speech imagery did not resemble the canonical alpha/beta desynchronization associated with motor imagery.
From: Bob Van Dyck [view email]
[v1]
Wed, 10 Jun 2026 15:34:33 UTC (6,121 KB)
[v2]
Wed, 24 Jun 2026 09:41:28 UTC (6,121 KB)
[v3]
Mon, 3 Aug 2026 12:26:57 UTC (7,237 KB)
此内容由惯性聚合(RSS阅读器)自动聚合整理，仅供阅读参考。 原文来自 — 版权归原作者所有。