Abstract: An example method includes positioning above the transcranial region, an arrangement of solenoids, and selecting a target zone from among a plurality of zones. A zone-specific set of Q solenoids is identified from the arrangement of solenoids, based on the target zone. The zone-specific set includes a pair of mutually adjacent ones of the solenoids. A Q-element solenoid feed modulation state vector is generated, which defines a Q-current element feed current modulation state. The Q-current element feed current modulation state is configured to cause the zone-specific set of Q solenoids to generate Q individual, spatially configured, time-varying magnetic fields that, in combination, establish a transcranial magnetic stimulation (TMS) inducing time-varying magnetic field, which induces a target hotspot TMS electric field. The hotspot TMS electric field is focalized to the target zone.

Abstract: Examples include spatially positioning, in a three-dimensional (3D) space, a conductive coil and a living subject in a 3D spatial relation in which a target 3D region of the living subject's tissue is within a designated 3D electric field formation region for the conductive coil. An energizing source feeds a low frequency (LF) modulated high frequency (HF) carrier voltage to terminals of the conductive coil. This urges a corresponding LF modulated HF coil current, of maximum magnitude MA, through the conductive coil. The HF frequency of the HF coil current produces a magnetic flux with a corresponding HF related rate of change. Optionally, a secondary coil feeds an unmodulated HF signal that spatially overlaps the modulated HF signals.

Abstract: An example method includes positioning above the transcranial region, an arrangement of solenoids, and selecting a target zone from among a plurality of zones. A zone-specific set of Q solenoids is identified from the arrangement of solenoids, based on the target zone. The zone-specific set includes a pair of mutually adjacent ones of the solenoids. A Q-element solenoid feed modulation state vector is generated, which defines a Q-current element feed current modulation state. The Q-current element feed current modulation state is configured to cause the zone-specific set of Q solenoids to generate Q individual, spatially configured, time-varying magnetic fields that, in combination, establish a transcranial magnetic stimulation (TMS) inducing time-varying magnetic field, which induces a target hotspot TMS electric field. The hotspot TMS electric field is focalized to the target zone.