Apparatuses and methods for neuromodulation
Apparatuses and methods of applying transdermal electrical stimulation (TES) to a subject to enhance a concurrent sensory experience, by applying the TES to the subject's head or head and neck from two or more electrodes that are coupled to a neurostimulator. The apparatuses and methods described herein be configured to apply an ensemble current waveform between the two or more electrodes, wherein the ensemble current waveform comprises a series of component waveforms that are sequentially applied, and wherein each component waveform is different from a component waveform immediately before it and wherein transitions between the component waveforms temporally correlates with transitions in the sensory experience. Also described herein are apparatuses and methods for applying TES to a subject's face or face and neck, wherein one end of the TES applicator (e.g., strip electrode) contacts the subject's cheek and/or mastoid. Finally, user interfaces for controlling TES are also described.
1. A method of applying transdermal electrical stimulation to a user using an electrode apparatus formed of a flat substrate extending in a plane having a first electrode portion and a second electrode portion, a first active region on a back of the substrate in the first electrode portion, and a second active region on the back of the substrate in the second electrode portion, wherein the first and second electrode portions are connected by a connecting region of the substrate that extends in a path that is 1.5 inches or longer, the method comprising:
adhesively securing the first active region of the electrode apparatus to the user's temple;
bending the connecting region out of the plane;
adhesively securing the second active region of the electrode apparatus to the user's cheek in front of the user's ear; and
coupling a wearable electrical stimulator to a first and second connector extending proud from the first electrode portion so that the wearable electrical stimulator is worn on the user in a first location.
2. The method of claim 1 , wherein coupling the wearable electrical stimulator to the first and second connector extending proud from the first electrode portion comprises snapping the wearable electrical stimulator onto the first and second connector wherein the first connector and the second connector are separated from each other by between about 0.7 and 0.8 inches.
3. The method of claim 1 , wherein coupling the wearable electrical stimulator to the first and second connector comprises snapping the wearable electrical stimulator onto the first and second connector.
4. The method of claim 1 , wherein adhesively securing the first active region comprises attaching a hydrogel on the first active region against the user's head.
5. The method of claim 1 , wherein coupling the wearable electrical stimulator comprises connecting an underside of the wearable electrical stimulator to the first and second connector to make an electrical contact with the wearable electrical stimulator and the first and second active regions.
6. The method of claim 1 , further comprising applying TES waveforms to evoke a state of energy in the user.
7. The method of claim 1 , wherein the wearable electrical stimulator is coupled to the first and second connector before adhesively securing the first active region of the electrode apparatus to the user's temple.
8. The method of claim 1 , wherein the wearable electrical stimulator is coupled to the first and second connector after adhesively securing the first active region of the electrode apparatus to the user's temple.
9. A method of applying transdermal electrical stimulation to a user using an electrode apparatus formed of a flat substrate extending in a plane having a first electrode portion and a second electrode portion, a first active region on a back of the substrate in the first electrode portion, and a second active region on the back of the substrate in the second electrode portion, wherein the first and second electrode portions are connected by a connecting region of the substrate that extends in a path that is 1.5 inches or longer, the method comprising:
adhesively securing the first active region of the electrode apparatus to the user's cheek in front of the user's first ear;
bending the connecting region out of the plane;
adhesively securing the second active region of the electrode apparatus to the user's cheek in front of the user's second ear; and
coupling a wearable electrical stimulator to a first and second connector extending proud from the first electrode portion so that the wearable electrical stimulator is worn on the user in a first location.
10. The method of claim 9 , wherein the wearable electrical stimulator is coupled to the first and second connector after adhesively securing the first active region of the electrode apparatus to the user's cheek.
11. The method of claim 1 , wherein the wearable electrical stimulator weighs less than 30 grams.
12. The method of claim 1 , wherein a first side of the wearable electrical stimulator has a first thickness that is less than a second thickness of a second side of the wearable electrical stimulator.
13. The method of claim 9 , wherein the wearable electrical stimulator is coupled to the first and second connector before adhesively securing the first active region of the electrode apparatus to the user's cheek.
14. The method of claim 9 , wherein coupling the wearable electrical stimulator to the first and second connector extending proud from the first electrode portion comprises snapping the wearable electrical stimulator onto the first and second connector wherein the first connector and the second connector are separated from each other by between about 0.7 and 0.8 inches.
15. The method of claim 9 , wherein coupling the wearable electrical stimulator to the first and second connector comprises snapping the wearable electrical stimulator onto the first and second connector.
16. The method of claim 9 , wherein adhesively securing the first active region comprises attaching a hydrogel on the first active region against the user's head in the first location.
17. The method of claim 9 , wherein coupling the wearable electrical stimulator comprises connecting an underside of the wearable electrical stimulator to the first and second connector to make an electrical contact with the wearable electrical stimulator and the first and second active regions.
18. The method of claim 9 , further comprising applying TES waveforms to evoke a state of energy in the user.
19. The method of claim 9 , wherein a subject-facing surface of the wearable electrical stimulator has a contoured shape.