默认空间理论：空间定向与平衡的统一振荡框架

文献信息

中文摘要

默认空间理论（DST）认为，意识体验源于同步的生理和神经振荡，这些振荡构建了一个内部三维“默认空间”，近似反映身体在外部世界中的位置。本文是将DST推测性扩展至空间定向和姿势平衡。我们提出，快速伽马波段振荡（约30-100 Hz）将视觉、听觉、躯体感觉和运动输入绑定为连贯的内部空间地图，而较慢的丘脑θ（4-8 Hz）和α（8-12 Hz）节律提供时间定向——门控感觉输入并允许快速姿势校正。我们将来自外周感受器（视网膜、耳蜗、前庭器官）和中枢结构（小脑、丘脑、皮层）的解剖学、组织学和电生理学发现综合为一个单一的振荡解释，并将其与传统模型进行对比，传统模型中小脑对前庭和本体感觉反馈进行误差校正。在DST下，丘脑整合门控和跨模态伽马同步发挥更大作用——我们认为这一主张与前庭性偏头痛和感觉性共济失调等临床综合征一致，在这些综合征中，尽管小脑回路完整，平衡仍然失败。我们概述了可检验的预测（例如，主动导航期间θ-伽马耦合增加）和潜在干预措施（例如，40 Hz或θ频率神经夹带），这些将有助于区分DST与标准模型，而不仅仅是与之兼容。

英文摘要

The Default Space Theory (DST) of consciousness holds that conscious experience arises from synchronized physiological and neural oscillations that construct an internal three-dimensional "default space" approximating the body's position in the external world. This paper is a conjectural extension of DST to spatial orientation and postural balance. We propose that fast gamma-band oscillations (~30-100 Hz) bind visual, auditory, somatosensory, and motor input into a coherent internal spatial map, while slower thalamic theta (4-8 Hz) and alpha (8-12 Hz) rhythms provide temporal orientation-gating sensory input and permitting rapid postural correction. We synthesize anatomical, histological, and electrophysiological findings from peripheral receptors (retina, cochlea, vestibular apparatus) and central structures (cerebellum, thalamus, cortex) into a single oscillatory account, and contrast it with the conventional model, in which the cerebellum performs error-correction on vestibular and proprioceptive feedback. Under DST, thalamic integrative gating and cross-modal gamma synchrony play the larger role-a claim we argue is consistent with clinical syndromes such as vestibular migraine and sensory ataxia, where balance fails despite intact cerebellar circuitry. We outline testable predictions (e.g., increased theta-gamma coupling during active navigation) and potential interventions (e.g., 40 Hz or theta-frequency neural entrainment) that would help distinguish DST from the standard model rather than merely being compatible with it.