Abstract: A method of neurostimulation may include delivering an electrical signal to a plurality of electrodes connected to a patient. The electrical signal may include a plurality of spaced-apart packets of electrical pulses. The method may include modulating at least one of a quantity of the plurality of electrical pulses within ones of the plurality of packets of electrical pulses, a width in time of the plurality of electrical pulses within ones of the plurality of packets of electrical pulses, an amplitude in voltage of the plurality of electrical pulses within ones of the plurality of packets of electrical pulses, a separation in time between adjacent ones of the plurality of electrical pulses within ones of the plurality of packets of electrical pulses, and a separation in time between adjacent ones of the plurality of packets of electrical pulses to modulate the electrical signal.

Abstract: An in-ear stimulation device for administering caloric stimulation to the ear canal of a subject includes a frame defining a perimeter and having a center region, at least one tensioning member in the center region of the frame and being held by the frame, and an earpiece connected to the tensioning member in the center region of the frame. The frame is configured to generally rest on a head and around an ear of the subject such that the earpiece is positioned in the ear canal of the subject and the tensioning member exerts a force on the earpiece toward the ear canal of the subject.

Abstract: A method of galvanic vestibular stimulation (GVS) may include delivering an electrical signal via transdermal electrical stimulation using a plurality of electrodes connected to a patient. The electrical signal may include an amplitude and a carrier frequency. The method may include modulating at least one of the amplitude and the carrier frequency based on a modulation waveform to modulate the electrical signal, the modulation waveform may include a modulation frequency that is less than the carrier frequency.

Abstract: Systems, devices, and methods for neurostimulation via vestibular stimulation are described. One example is a device for administering thermal stimulation to an ear canal of a subject. The device may include an earpiece configured to be at least partially insertable into the ear canal of the subject; a thermoelectric device thermally coupled to the earpiece and configured to heat and/or cool the earpiece to thereby heat and/or cool the ear canal of the subject; and a controller configured to administer a selected treatment plan including administering a caloric vestibular stimulation (CVS) stimulus to the ear canal of the subject in a condition-treatment effective amount during a first treatment interval. The treatment plan may be effective to produce a durable improvement in at least one symptom of the condition for a time of at least 1 week following cessation of the administering.

Abstract: A vestibular neurostimulation device, which may include first and second electrodes; first and second thermoelectric devices thermally coupled, respectively, to first and second earpieces that are configured to be insertable into respective ear canals of a patient; and a controller comprising a waveform generator. The waveform generator may be is configured to deliver a modulated electric signal to the patient through galvanic vestibular stimulation (GVS) using the first and second electrodes and to deliver a time varying thermal waveform to the patient through caloric vestibular stimulation (CVS) using the first and second earpieces simultaneous with the delivery of the modulated electrical signal through GVS. The CVS and/or GVS may be configured to increase a passage of insulin-like growth factor 1 (IGF-1) through a blood-brain-barrier.

Abstract: A method of neurostimulation may include delivering an electrical signal to a plurality of electrodes connected to a patient. The electrical signal may include an amplitude and a carrier frequency. The method may include modulating the electrical signal based on an audio waveform. In some embodiments, the modulating may include modulating at least one of the amplitude and the carrier frequency based on the audio waveform to modulate the electrical signal.

Abstract: An in-ear stimulation device for administering caloric stimulation to the ear canal of a subject includes (a) first and second earpieces configured to be insertable into the ear canals of the subject; (b) at least first and second thermoelectric devices thermally coupled to respective ones of the first and second earpieces; (c) a first heat sink thermally coupled to the first thermoelectric device opposite the first earpiece and a second heat sink thermally coupled to the second thermoelectric device opposite the second earpiece; and (d) a controller comprising a waveform generator in communication with the first and second thermoelectric devices, the waveform generator configured to generate a first control signal to control a first caloric output to the first thermoelectric device and a second control signal to control a second caloric output to the second caloric device.