[Effect of carbacholine and serotonin on the ATPase activity in synaptosomes of the projection and association areas of the feline cerebral cortex].

Na, K-ATPase and Mg-ATPase activities were measured in the synaptosomes of the temporal auditory projection area and the frontal association area. Moreover, the effects of carbacholine and serotonin on those activities were investigated. Na, K-ATPase activity in the synaptosomes of the association area was shown to be reliably higher that in the synaptosomes of the projection area (11.

Effect of microiontophoretic application of acetylcholine on visual cortical evoked activity to direct cortical stimulation.

Responses of visual cortical neurons (area 17) to direct cortical stimulation of visual areas 18 and 19 were investigated in acute experiments on adult unanesthetized cats, immobilized with diplacin, under local anesthesia, after microiontophoretic application of acetylcholine. Selectivity of the action of acetylcholine on the individual components of the unit responses to direct cortical stimulation was established. The role of acetylcholine as mediator of information in the mechanisms of transcortical interneuronal interaction within the visual system is discussed.

[The effect of microiontophoretic administration of acetylcholine on evoked activity of visual cortex neurons subjected to direct cortical stimulation].

Reactions of visual cortical neurons (field 17) were studied in unanesthetized curarized cats. Neuronal responses to direct electric stimulation of the 18th and the 19th fields were studied after microiontophoretic administration of acetylcholine--chloride through 2-channel microelectrodes. The acetylcholine effect upon the primary discharge and the first trace pause, was specifically organized.