Electroencephalography-based Precise Repetitive Transcranial Magnetic Stimulation Treatment

The target site for alpha frequency Transcranial Magnetic Stimulation (αTMS) was identified based on alterations in alpha band spectral connectivity, which were measured using four frontal electroencephalography (EEG) channels (F1, F3, F5, FC3) subsequent to 10Hz transcranial magnetic stimulation (TMS). Alpha band spectral connectivity refers to the degree of similarity between the spectral waveforms of the alpha band across channels. The alpha frequency stimulation rate was defined as the highest spectral peak within the alpha band ranging from 7 to 13 Hz of the target channel. Each treatment cycle consisted of 20 daily sessions over a 4-week span, and stimulation was administered for 2 seconds every minute for a total duration of 20 minutes at 80% of the individual's motor threshold.

Prefrontal Transcranial Magnetic Stimulation (TMS) therapy repeated daily over 4 weeks (20 sessions) is US Food and Drug Administration (FDA) approved for treating Major Depressive Disorder in adults who have not responded to prior antidepressant medications. The strongest evidence supports high-frequency treatment over the left dorsolateral prefrontal cortex (DLPFC). The common stimulation frequency is 10Hz. It is usually applied for a duration of 4 weeks, 5 days a week.