        1 Research and instrumental development fro the construction
        of the stimoceiver was supported by the United States Air
        Force, 6571st Aeromedical Research Laboratory F 29600-67-C-
        0058.  Additional support for our research was provided by
        the United States Public Health Service, M-2004, and the
        Office of Naval Research, 609 (48).

        The circuit for EEG recording is a modified version of the
        unit described by Meehan (1965), and his help in providing
        us with the information and one of his units is gratefully
        acknowledged.  The help of Mr. Per Ha...[unreadable]
        developing telestimulation is also gratefully acknowledged.

    During the last few years, methodology has been developed to stimulate
    and record the electrical activity of the brain in completely unrestrained
    monkeys and chimpanzees (Delgado, 1967; Delgado and Mir, in press).  This
    procedure should be of considerable clinical interest because it permits
    exploration of the brain for unlimited periods without disturbing their
    rest or normal spontaneous activities. [EW: Dr. Delgado, you are all heart!]

    This paper reports instrumentation used and clinical application in four
    patients with psychomotor epilepsy in whom electrodes had been implanted in
    the temporal lobes.  To our knowledge, this is the first use of intercereb-
    ral radio stimulation and recording in man.

    METHODS
    page 185

    Implantation of electrodes

    Electrodes were constructed and stereotaxically implanted according to
    methods previously described (Mark & Ervin, 1969).  The electrode assemblies
    which were connected to a McPherson skull plug, consisted of a plastic
    stylet, 1.2 mm in diameter, with 15 stainless steel ? mm wide contacts at
    3 mm intervals, plus one thermistor and three other contacts at the tip.

    Using a McPherson Type 2 stereotaxic machine (Mark & Ervin, 1969), electrode
    assemblies were implanted ???laterally into the anterior medical amygdala
    of each patient.

    Radio Stimulation

    This system consists of two instruments:  (1) the RF transmitter that
    measures 30 cm x 25 cm x 15 cm and includes the circuitry for controlling
    repetition rate, duration, and amplitude (intensity) of the stimulating
    pulse.  The repetition rate may be varied in steps between 10 and ?? Hz
    and the duration between 0.1 and 1.5 millisec.  Single pulses may also
    be generated.

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