Spectral Characteristics of Memory Transformation

Inclusion criteria

• Age 18 years or older (2/3 of the final sample will be ≥60years of age)
• No previous stroke, brain tumor, neurodegenerative disease, or trauma to the head
• Ability to give consent for study participation
• who have access to a personal computer with internet

Exclusion criteria

• • Pregnancy

• Inability to use all ten fingers to type on a standard computer keyboard
• Uncorrected vision, hindering perception of visual cues presented on a standard computer screen
• Medication use at the time of study that may interfere with learning or the effect of tACS, including but not limited to carbamazepine, flunarizine, sulpiride, rivastigmine, dextromethorphan;
• Neuromuscular disorders affecting hand and finger movements necessary for 10-finger keyboard typing
• Presence of neurological or psychiatric disorders
• Presence of scalp injury or disease
• Prior history of seizures
• Prior intracranial surgery
• Prior brain radiotherapy
• Prior history of intracranial tumor, intracranial infection, or cerebrovascular malformation
• Metal in head or neck
• Contraindications to MRI (such as severe claustrophobia, implanted medical devices)