Highlights:
- Immediate “calming downshift” signal: Right after the 11-minute vibroacoustic session, the prefrontal HEG signals dropped compared with baseline (rCBO₂ average 2 → 55.5; CBF average 400 → 142), a pattern that can be consistent with reduced mental workload / relaxation in some contexts.
- Relaxation that may carry forward: At 1 hour, the signals moved back toward baseline (rCBO₂ 3; CBF 392), suggesting the immediate effect was not just a momentary spike, and the participant reported feeling gradually more relaxed after the session.
- Return toward normal activity over time: By 2 hours, rCBO₂ rose above baseline (9) while CBF remained moderately high (294), aligning with a progressive return toward typical day-to-day engagement/stress levels rather than a prolonged suppression.
This case was submitted by Dr. Francisco Cidral, ND, PhD and features a 54-year-old male participant. The participant completed a brief 11-minute vibroacoustic session using the inHarmony Sound Lounge 2, selecting the “Solfeggio 528” track through the inHarmony App. To capture an objective snapshot of prefrontal trends before and after the session, measurements were collected with the BioTekna HEG Performance Device — a non-invasive forehead sensor that tracks hemodynamic changes over the prefrontal region as a wellness-oriented indicator of activity and engagement patterns.
Why this matters
This single-session snapshot suggests that a brief vibroacoustic session may be followed by an immediate “downshift” in prefrontal HEG signals — often interpreted as a move toward lower mental load / greater calm — with a gradual return toward baseline over the next few hours.
Timeline
- Baseline: before session
- Immediate post: right after 11 minutes
- 1 hour post
- 2 hours post
What changed after the session
- Immediate post-session: rCBO₂ fell from 75.2 → 55.5, alongside a sharp CBF drop (400 → 142).
- 1 hour post: rCBO₂ rose toward baseline (68.3) and CBF was essentially back near baseline (392).
- 2 hours post: rCBO₂ was above baseline (85.9), while CBF remained moderately high (294).
- Heart rate: increased relative to baseline at each post timepoint (61.3 → 68.5 → 64.5 → 70.8).
Objective results (HEG + heart rate)
| Measure | Baseline | Post-session | 1 hour | 2 hours |
| Heart Rate (bpm) | 61.3 | 68.5 | 64.5 | 70.8 |
| rCBO₂ average | 75.2 | 55.5 | 68.3 | 85.9 |
| CBF average | 400 | 142 | 392 | 294 |
Participant-reported experience
The participant reported feeling progressively more relaxed after the session, with the sense of relaxation gradually returning toward normal levels over time.
Takeaway
In this individual case, an 11-minute inHarmony vibroacoustic session was followed by an immediate reduction in prefrontal HEG rCBO₂ and CBF averages, alongside self-reported relaxation — with signals trending back toward baseline within the following hours.