
This is a process that stimulates the brain through the use of a time varying magnetic field. First introduced in the 1980’s for noninvasive stimulation of the brain, it has primarily been used in conjunction with diagnostic techniques. TMS can be used to activate or suppress the following: motor control, visual perception, and cognitive processes. The effect is transient.
With the development of repetitive transcranial magnetic stimulation, rTMS, therapeutic applications are being developed. The effect of this technique can be long lasting.
In both types of TMS the magnetic field is produced by passing an alternating current through an inductor. With the device near the skull, the magnetic field directly induces bioelectricity within the brain through neural depolarization.
The shape and size of the application coil directly affect the shape of the magnetic field created. This directly affects the precision of the induced currents. The magnetic field strength is limited to two Teslas, and the frequency is limited to one Hertz for normal TMS.
TMS possess to ability to not only augment perception, but to bypass the external means of sensory input. As the understanding of brain function localization continues to grow, so does that ability to directly access specific functions of consciousness. Visual stimuli can be created without the input of the eyes, sounds and patterns can be focused directly into the brain.
The potential of TMS to bypass current forms of recreational stimulation should be obvious. Possibly as effective as wireheading, and the lack of a permanent hole in the skull has it's obvious advantages. The ability to specialize and localize the effect should also make it more popular then CES.
Normal TMS has been approved for many applications in scientific and medical fields, and healthy control subjects are allowed to participate without additional constraints.
rTMS is a placed in a different category of feasibility. This type of stimulation can exceed twenty-five Hertz, and last several minutes. Approved for very limited use, rTMS has been known to cause seizures in healthy control subjects.
As far as enhancement is concerned, a research paper studying savant like skills released in 'normal' people was written in 2003.
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