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By Miguel A. L. Nicolelis
Neuroscientists have lengthy famous the significance of figuring out the underlying ideas of data processing through huge populations of neurons. equipment for Neural Ensemble Recordings explores equipment for utilizing electrophysiological ideas for tracking the concurrent job of ensembles of unmarried neurons. due to the fact that present tools enable one to concurrently list the extracellular job of as much as 100-150 neurons for days or perhaps weeks, neural ensemble recordings were used to deal with long-standing concerns in improvement, studying, reminiscence, sensorimotor integration, sensory details processing, and neuronal plasticity.
EXAMINES the various attainable purposes FOR THIS progressive METHOD
Each bankruptcy bargains a step by step description for the implementation of a specific strategy or experimental paradigm making use of simultaneous a number of electrode recordings. The strategies defined can be utilized in functions that influence a wide crew of existence scientists, including:
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Neurosci. , 2, 153, 1980. 14. Humphrey, D. , A chronically implantable multiple micro-electrode system with independent control of electrode position, Electroencephalography and Clinical Neurophysiology, 29, 616, 1970. 15. Humphrey, D. , Schmidt, E. , Thompson, W. , Predicting measures of motor performance from multiple cortical spike trains, Science, 170(959), 759, 1970. 16. Campbell, P. , Jones, K. , Normann, R. , A 100 electrode intracortical array: structural variability, Proc. 27th Annu. Rocky Mountain Bioeng.
Eventually, these electrodes can be interfaced with telemetric circuits to facilitate studies concerned with relating neural activity to more complex behaviors. However, there are some drawbacks to the currently available electrodes. For example, silicon electrodes tend to be very brittle. The University of Michigan has reduced this problem by making them more flexible, though the flexibility makes it very difficult to penetrate the dura. In addition, most of the electrodes have the recording sites along the length of the substrate so that after insertion, some of the sites are in contact with tissue that has been damaged during insertion.
A sample of four different types of arrays (from left to right: an eight-wire bundle, an array of 2 × 3 × 3, a double eight-wire bundle, and a 16-wire cortical array. B. A side view of an eight-wire array. C. A view from the bottom of a 16-wire cortical array. The array consists of two rows of eight wires. D. A view from the bottom of a 2 × 3 × 3 array. The array consists of three rows: one row of two wires and two rows of three wires. break them. One method for reducing breakage is to mount the electrode to a dissecting pin before insertion to give it added stability.