There's no shortage of apps and technology that claim to shift the brain into a "theta ... using EEG (electroencephalography) ...

Seven EEG characteristics—that is ... The relationship between alpha and theta waves produces piano and harp sounds, while that between beta and alpha waves creates synthesizer sounds.

The system utilizes AI to analyze EEG data, mainly focusing on signals like P300, theta, beta, and other frequencies to detect differences between truthful and deceptive responses.