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Recordings were made with either tungsten-in-glass microelectrodes
(Merrill and Ainsworth, 1972), advanced with an hydraulic microdrive, or
quartz-platinum-tungsten microelectrodes (Thomas Recording, Giessen,
Germany), advanced with a mechanical microdrive system. Signals from
the microelectrode were amplified and bandpass-filtered, and we
isolated single units with a dual-window time-amplitude discriminator
(Bak, Germantown, MD). The time of each action potential was recorded
with a resolution of 0.25 ms by a CED-1401 Plus laboratory interface
(Cambridge Electronic Design, Cambridge, UK).
Matthew A. Smith
2003-01-17