Graduate School of Interdisciplinary Science and Engineering in Health Systems, Okayama University, Okayama, Japan.
Japan Society for the Promotion of Science, Tokyo, Japan.
Sci Adv. 2019 May 15;5(5):eaav9053. doi: 10.1126/sciadv.aav9053. eCollection 2019 May.
When humans perceive a sensation, their brains integrate inputs from sensory receptors and process them based on their expectations. The mechanisms of this predictive coding in the human somatosensory system are not fully understood. We fill a basic gap in our understanding of the predictive processing of somatosensation by examining the layer-specific activity in sensory input and predictive feedback in the human primary somatosensory cortex (S1). We acquired submillimeter functional magnetic resonance imaging data at 7T ( = 10) during a task of perceived, predictable, and unpredictable touching sequences. We demonstrate that the sensory input from thalamic projects preferentially activates the middle layer, while the superficial and deep layers in S1 are more engaged for cortico-cortical predictive feedback input. These findings are pivotal to understanding the mechanisms of tactile prediction processing in the human somatosensory cortex.
当人类感知到一种感觉时,他们的大脑会整合来自感觉受体的输入,并根据他们的期望对其进行处理。人类体感系统中这种预测编码的机制尚未完全了解。我们通过检查人类初级体感皮层(S1)中感觉输入和预测反馈的特定层活动,填补了对体感预测处理理解的基本空白。我们在进行感知、可预测和不可预测触摸序列的任务期间,在 7T(=10)下获取了亚毫米功能磁共振成像数据。我们证明,来自丘脑的感觉输入优先激活中间层,而 S1 的浅层和深层层则更适合皮质皮质预测反馈输入。这些发现对于理解人类体感皮层中触觉预测处理的机制至关重要。