Longitudinal Study to Investigate Different Transcranial Electrical Stimulation

"A light electrical current with zero frequency (tDCS) will be applied to the scalp of the participants via 2 electrodes, while the participants performs cognitive exercises with the guidance of a trained research assistant. They have the option of having their choice of music play in the background while they perform the cognitive exercise.~cognitive exercises Participant will perform memory and learning games/tasks through Mind Triggers app on an IPad and other cognitive games. Participants will be guided by a highly trained research assistant."

"A light electrical current with 30 Hz frequency (tACS) will be applied to the scalp of the participants via 2 electrodes, while the participants performs cognitive exercises with the guidance of a trained research assistant. They have the option of having their choice of music play in the background while they perform the cognitive exercise.~cognitive exercises Participant will perform memory and learning games/tasks through Mind Triggers app on an IPad and other cognitive games. Participants will be guided by a highly trained research assistant."

"A light electrical current with 50 Hz frequency (tACS) will be applied to the scalp of the participants via 2 electrodes, while the participants performs cognitive exercises with the guidance of a trained research assistant. They have the option of having their choice of music play in the background while they perform the cognitive exercise.~cognitive exercises Participant will perform memory and learning games/tasks through Mind Triggers app on an IPad and other cognitive games. Participants will be guided by a highly trained research assistant."

"A light electrical current with 70 Hz frequency (tACS) will be applied to the scalp of the participants via 2 electrodes, while the participants performs cognitive exercises with the guidance of a trained research assistant. They have the option of having their choice of music play in the background while they perform the cognitive exercise.~cognitive exercises Participant will perform memory and learning games/tasks through Mind Triggers app on an IPad and other cognitive games. Participants will be guided by a highly trained research assistant."

"A light electrical current with 90 Hz frequency (tACS) will be applied to the scalp of the participants via 2 electrodes, while the participants performs cognitive exercises with the guidance of a trained research assistant. They have the option of having their choice of music play in the background while they perform the cognitive exercise.~cognitive exercises Participant will perform memory and learning games/tasks through Mind Triggers app on an IPad and other cognitive games. Participants will be guided by a highly trained research assistant."

"A light electrical current with random noise waveform (tRNS) will be applied to the scalp of the participants via 2 electrodes, while the participants performs cognitive exercises with the guidance of a trained research assistant. They have the option of having their choice of music play in the background while they perform the cognitive exercise.~cognitive exercises Participant will perform memory and learning games/tasks through Mind Triggers app on an IPad and other cognitive games. Participants will be guided by a highly trained research assistant."