A series of cats was operantly trained to produce specific transient brain rhythms following periodic presentations of a light flash stimulus (experiment 1). The specifity of the frequency of the modulation was tested on another group of untrained cats (experiment 2, preliminary testing session).
|Exposure duration||50 min, 6 days|
|Modulation frequency||1–25 Hz|
|Modulation depth||90 %|
|power density||10 W/m²||-||-||-||40 per cent loss in room|
The results indicate that low level VHF fields, amplitude modulated at specific frequencies, produce marked effects on conditioned specific brain rhythms (e.g. enhanced regularity of the patterns, sharpening of the spectral peaks around the central frequency of the response). These effects cannot to be attributed to the conditioning procedure, since the results started to diverge from the two controls only after imposition of the fields. The innumerable tests conducted within every session and the sharp contrast in the EEG between correct versus incorrect responses strongly suggest a genuine biological transduction in the CNS, which could be described as an enhancement of frequency-related biological rhythms.
The data obtained in the second experiment indicate that it is indeed possible to selectively enhance various brain rhythms by reinforcing their spontaneous occurrence with short irradiations by the fields, amplitude-modulated at appropriate frequencies. The hypothesis is offered that the fields were acting as effective contingent reinforcers in both experiments.