By N. A. Aladzhalova
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Extra info for Slow Electrical Processes in the Brain
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The tube filaments a r e heated by storage batteries. A needle millivoltmeter (R = l o o n ) and the 5T loop of an MPO-2 loop oscillograph a r e connected in s e r i e s at the amplifier output. Average gain (with 1 mV input) provides a beam deflection of 12 mm on photographic film. Under these conditions zero drift is virtually absent for 30 min. This circuit is simple and highly stable due to operation of the tubes of the first stage under so-called "starved-circuit" conditions. The choice of a large plate resistor in the f i r s t stage (16 Mn) makes it possible to operate with a very low plate-current and still obtain a gain of 1000 in the first stage.
In some experiments, the ISPO was of the same frequency in all layers of the cortex. In many 44 INFRASLOW RHYTHMIC P O T E N T I A L OSCILLATIONS Fig. 13. Bipolar recording from the upper (A) and lower (B) layers of the cortex by means of three microelectrodes. experiments, the frequency of the ISPO was higher in the upper layers of the cortex (7-8 osc/min) than in the lower layers (3-5 osc), These experiments indicate, first, that the processes reflected in the appearance of ISPO a r e local in character and, secondly, that infraslow potentials do not spread any further than about 1 mm.
Rhythms were almost absent in records from the top electrode (A), while ISPO (B) with a frequency of 4 osc/min were recorded from the middle and bottom microelectrodes. In some experiments, the ISPO was of the same frequency in all layers of the cortex. In many 44 INFRASLOW RHYTHMIC P O T E N T I A L OSCILLATIONS Fig. 13. Bipolar recording from the upper (A) and lower (B) layers of the cortex by means of three microelectrodes. experiments, the frequency of the ISPO was higher in the upper layers of the cortex (7-8 osc/min) than in the lower layers (3-5 osc), These experiments indicate, first, that the processes reflected in the appearance of ISPO a r e local in character and, secondly, that infraslow potentials do not spread any further than about 1 mm.