Abstract
AbstractCharacterization of inter-regional interactions in brain is essential for understanding the mechanism relevant to normal brain function and neurological disease. The recently developed flexible micro (μ)-electrocorticography (μECoG) device is one prominent method used to examine large-scale cortical activity across multiple regions. The sheet-shaped μECoG electrodes arrays can be placed on a relatively wide area of cortical surface beneath the skull by inserting the device into the space between skull and brain. Although rats and mice are useful tools for neuroscience, current μECoG recording methods in these animals are limited to the parietal region of cerebral cortex. Recording cortical activity from the temporal region of cortex in mice has proven difficult because of surgical barriers created by the skull and surrounding temporalis muscle anatomy. Here, we developed a sheet-shaped 64-channel μECoG device that allows access to the mouse temporal cortex, and we determined the factor determining the appropriate bending stiffness for the μECoG electrode array. We also established a surgical technique to implant the electrode arrays into the epidural space over a wide area of cerebral cortex covering from the barrel field to olfactory (piriform) cortex, which is the deepest region of the cerebral cortex. Using histology and computed tomography (CT) images, we confirmed that the tip of the μECoG device reached to the most ventral part of cerebral cortex without causing noticeable damage to the brain surface. Moreover, the device simultaneously recorded somatosensory and odor stimulus-evoked neural activity from dorsal and ventral parts of cerebral cortex in awake and anesthetized mice. These data indicate that our μECoG device and surgical techniques enable the recording of large-scale cortical activity from the parietal to temporal cortex in mice, including somatosensory and olfactory cortices. This system will provide more opportunities for the investigation of physiological functions from wider areas of the mouse cerebral cortex than those currently available with existing ECoG techniques.
Funder
JSPS KAKENHI
The Tochigi Industrial Promotion Center
The Nakatomi Foundation
Dokkyo Medical University, Investigator-Initiated Research Grant
Dokkyo Medical University, Project Research Grant
The Dokkyo International Medical Education and Research Foundation
JST PRESTO
The Casio Science Promotion Foundation
The Toyoaki Scholarship Foundation
The Foundation of Public Interest of Tatematsu
The Research Foundation for Opto-Science and Technology
The Naito Foundation
The Astellas Foundation for Research on Metabolic Disorders
The Takeda Science Foundation
Publisher
Springer Science and Business Media LLC
Subject
Cellular and Molecular Neuroscience,Molecular Biology