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A method for providing electrical stimulation to a user, the method comprising: providing an electrical stimulation device, in communication with a controller, at a head region of the user; with the electrical stimulation device, providing a stimulation treatment having a waveform configured for neu

A method for providing electrical stimulation to a user, the method comprising: providing an electrical stimulation device, in communication with a controller, at a head region of the user; with the electrical stimulation device, providing a stimulation treatment having a waveform configured for neuromodulation in the user; with the controller, performing an adjustment to the stimulation treatment, wherein performing the adjustment includes: generating a transformed waveform with application of a transfer function to the waveform, wherein the transfer function scales the waveform and selectively attenuates extreme waveform values while maintaining a frequency characteristic of the waveform in the transformed waveform; and applying the transformed waveform with the electrical stimulation device, thereby modulating the stimulation treatment.

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1. A method for providing electrical stimulation to a user, the method comprising: providing an electrical stimulation device, in communication with a controller, at a head region of the user;with the electrical stimulation device, providing a stimulation treatment having a waveform configured for n

1. A method for providing electrical stimulation to a user, the method comprising: providing an electrical stimulation device, in communication with a controller, at a head region of the user;with the electrical stimulation device, providing a stimulation treatment having a waveform configured for neuromodulation in the user; wherein the waveform comprises a superposed waveform including superposition of two or more of: delta-band, theta-band, alpha-band, gamma-band, and beta-band components;at the controller, determining an adjustment to the stimulation treatment;in near-real time and in response to the adjustment, generating a transformed waveform with application of a transfer function to the waveform; andapplying the transformed waveform with the electrical stimulation device, thereby modulating the stimulation treatment in near-real time. 2. The method of claim 1, wherein the transfer function scales the waveform and selectively attenuates extreme waveform values while maintaining a characteristic of the waveform in the transformed waveform. 3. The method of claim 1, further comprising providing an electrode of the electrical stimulation device at a prefrontal cortex region of the user. 4. The method of claim 1, further comprising providing the stimulation treatment to at least one of a right parietal region and a left parietal region of the head region of the user. 5. The method of claim 1, wherein the superposed waveform comprises a direct-current portion having a first duration and a resting interval having a second duration equal to the first duration. 6. The method of claim 1, further comprising characterizing a neurological state of the user, and determining the adjustment based on the neurological state of the user. 7. The method of claim 1, further comprising receiving a signal from a sensor channel associated with a frontal lobe region of the user, determining a frequency component of the signal, and wherein the waveform configured for neuromodulation in the user comprises the frequency component. 8. The method of claim 7, wherein the stimulation treatment comprises a first stimulation signal associated with a left frontal lobe region of the user and a second stimulation signal associated with a right frontal lobe region of the user, and wherein the first stimulation signal comprises a 0° phase lag relative to the second stimulation signal. 9. The method of claim 1, wherein determining the adjustment comprises receiving the adjustment to the stimulation treatment, by the user. 10. The method of claim 9, wherein receiving the adjustment includes receiving an input indicative of a desire to increase the current amplitude of the stimulation treatment, the input made by the user at the controller in communication with the electrical stimulation device. 11. The method of claim 1, further comprising monitoring a biological parameter of the user indicative of a cognitive state of the user, and automatically generating the transformed waveform in response to a comparison between the biological parameter and a threshold condition. 12. The method of claim 1, wherein the biological parameter comprises an electroencephalogram signal parameter. 13. A method for providing electrical stimulation to a user, the method comprising: providing an electrical stimulation device, in communication with a controller, at a head region of the user;with the electrical stimulation device, providing a stimulation treatment having a waveform configured for neuromodulation in the user, wherein the waveform comprises a superposed waveform including superposition of theta-band and gamma-band frequency components;with the controller, performing an adjustment to the stimulation treatment, wherein performing the adjustment includes generating a transformed waveform; andapplying the transformed waveform with the electrical stimulation device. 14. The method of claim 13, wherein generating the transformed waveform comprises applying a transfer function to the waveform, wherein the transfer function scales the waveform and selectively attenuates extreme waveform values while maintaining a frequency characteristic of the waveform in the transformed waveform. 15. The method of claim 13, wherein providing the stimulation treatment comprises providing one or more of: direct current (DC) stimulation, alternating current (AC) stimulation, pseudorandom noise stimulation, band-limited random noise stimulation, and stimulation with composite superposed waveforms. 16. The method of claim 13, wherein providing the stimulation treatment comprises providing a variable frequency stimulation treatment. 17. The method of claim 16, wherein providing the variable frequency stimulation treatment comprises determining a frequency component of a neural signal detected at the head region of the user, wherein the variable frequency stimulation treatment comprises the frequency component. 18. The method of claim 13, further comprising monitoring a biological parameter of the user indicative of a cognitive state of the user, and automatically generating the transformed waveform in response to a comparison between the biological parameter and a threshold condition. 19. The method of claim 18, wherein monitoring the biological parameter comprises monitoring one or more of: electroencephalogram signals of the user, cardiovascular signals of the user, and galvanic skin response of the user. 20. The method of claim 13, wherein providing the stimulation treatment includes providing the stimulation treatment in coordination with provision of a task to the user, and wherein performing the adjustment is in response to receiving an input by the user at the controller to decrease a current amplitude of the stimulation treatment.