检查本地网络处理采用多接触层电极记录
Summary
我们了解皮质电路中的一个根本的问题是，如何在不同的皮质层的网络感官的信息进行编码。在这里，我们描述了利用多接触层电极的电生理技术记录单单位和地方领域的潜力和目前的分析，以确定皮质层。
Abstract
皮质层是无处不在整个大脑皮层1-4高度经常性的本地网络的组成结构。近年来，已取得了重大进展，我们的理解差异，在应对不同的皮质层5-8神经元属性，但仍然是一个伟大的左了解神经元的人群是否，以及如何在特定层的信息进行编码处理方式。
现有的多电极阵列技术，虽然测量皮质空间沿皮层表面的许多毫米的反应信息，是不适宜的做法层皮质电路问题。在这里，我们提出我们的方法，为建立和记录单个神经元和跨越的初级视觉皮层（V1）皮质层局部场电位（LFPs），利用多接触电极层（图1; Plextrode U型探头，Plexon公司公司）。
的方法包括录音设备建设，皮质层的识别，并确定单个神经元的感受野。要找出皮质层，我们衡量LFP使用满场闪现刺激时间序列诱发反应电位（ERPs）。然后，我们执行的电流源密度（CSD）分析，以确定在基地的第4层（第4层的水槽内，后来被称为颗粒层 9-12）片源配置的陪同下极性反转。电流源密度是有用的，因为它提供了一个索引的位置，方向，和跨膜电流流过密度，使我们能够准确定位电极记录在一个单一的渗透层6，11，12。
Protocol
1。南Microdrive微型建设南电极驱动系统相结合，我们使用的U型探头。建立这个系统需要2-3个小时，但一旦建成，这是非常简单的修改。我们开始组装，其中包括一个4通道的基础（图2a）南塔，南腔（图2b），网格间距1毫米（图2c），1-4螺钉微型硬盘（图2d），1 -4导管（图2E，直径为500微米，并削减约5-7厘米），和1-4微型硬盘塔（图2F）。为方便起见，我们将描述为建设有一个塔?…
Discussion
多单元的录音已经成为分析皮层中的神经网络是如何刺激信息进行编码的标准。执行层电极由于电极技术的最新进展，使局部皮层电路前所未有的特性。虽然多电极记录提供了有关神经种群动态的有用信息，使多个层电极更高的分辨率和更多的神经元的具体位置信息。由于皮层与解剖不同的输入和输出层的组织，这引起了在这些层disparately感觉信息是如何处理的问题。
我们已…
Divulgazioni
The authors have nothing to disclose.
Acknowledgements
我们感谢王晔讨论和行为训练索林Pojoga。由美国国立卫生研究院尤里卡计划，国家眼科研究所，皮尤学者奖励计划，詹姆斯S ·麦克唐纳基金会（VD），以及美国国立卫生研究院视力训练津贴（BJH）支持。
Materials
| Name of Equipment | Company | Catalogue number | Comments |
| Nan microdrive system | Nan Instruments | NAN-S4 | Figure 2. Custom clamps are needed to use the U-Probe. Everything mentioned with exception of the U-Probe is provided by NAN instruments. |
| Screw microdrives | MIT Machine shop | Anything that is able to secure a guide tube to the NAN grid should be appropriate. | |
| Stainless Steel Guide Tubes | Small Parts | B00137QHNS (1) or B00137QHO2 (5) | These are 60 in long and cut to size in the laboratory using a Dremel hand drill |
| Plexon U-Probe | Plexon, Inc | PLX-UP-16-25ED-100-SE-360-25T-500 | See U-Probe specifications available at www.plexon.com Also see Figure 1. |
Table 1. Hardware.
| Name of Software | Company | Website | Comments |
| NAN software | NAN | http://www.naninstruments.com/DesignConcept.htm | Computer interface requires an additional serial port to accommodate the Plexon system and the NAN hardware |
| Offline Sorter, FPAlign, PlexUtil, MATLAB programs | Plexon | http://www.plexon.com/downloads.html#Software | Under ‘Installation Packages’ |
| NeuroExplorer | NeuroExplorer | http://www.neuroexplorer.com/ | Under ‘Resources’ |
| CSDplotter Version 0.1.1 | Klas H. Petterson | http://arken.umb.no/~klaspe/user_guide.pdf |
Table 2. Software.
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Tags
Local Network ProcessingMulti-contact Laminar Electrode RecordingCortical LayersResponse PropertiesNeuronal PopulationsLaminar-specific EncodingMulti-electrode Array TechniquesCortical CircuitsPrimary Visual Cortex (V1)Multi-contact Laminar ElectrodesRecording Device ConstructionIdentification Of Cortical LayersReceptive FieldsEvoked Response Potentials (ERPs)Current-source Density (CSD) Analysis
Citazione di questo articolo
Hansen, B. J., Eagleman, S., Dragoi, V. Examining Local Network Processing using Multi-contact Laminar Electrode Recording. J. Vis. Exp. (55), e2806, doi:10.3791/2806 (2011).