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J Neurophysiol (November 10, 2004). doi:10.1152/jn.00581.2004
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Submitted on June 7, 2004
Accepted on November 4, 2004

Spatial Reconstruction of Trajectories of an Array of Recording Microelectrodes

Thomas Naselaris1, Hugo Merchant1, Bagrat Amirikian1, and Apostolos P. Georgopoulos1*

1 Brain Sciences Center, VA Med Ctr, Minneapolis, MN, USA

* To whom correspondence should be addressed. E-mail: omega{at}umn.edu.

We present a method for estimating the locations of sites visited by an array of microelectrodes. The method relies on visualization of tracks made by electrodes coated in a fluorescent dye. These tracks are used to estimate the parameters of a simple geometrical model that generates coordinates for each recording site. We describe several ways to measure the error of this procedure, and present experimental results from recordings in the motor cortex of macaque monkeys that suggest that errors are of the order of 230 µm. We also introduce a coordinate transformation that takes into account the convoluted structure of the cortex near sulci to conveniently visualize recording site locations in a rectilinear representation. This method greatly extends the capabilities of microelectrodes for studying the 3-dimensional structure of topographic maps in the cortex.




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