Phase-shift treatment for tinnitus of cochlear origin

Area of Science:

• Audiology
• Neuroscience
• Therapeutic Technologies

Background:

• Tinnitus is a perception of sound without an external source.
• Phase-shift therapy proposes sound wave cancellation to alleviate tinnitus.
• This technique aims to negate cortical tinnitus perception via phase-shifted sound induction.

Purpose of the Study:

• To compare the efficacy of phase-shift therapy in pure tone tinnitus patients (PTP) versus narrow band noise tinnitus patients (NBNP).
• To evaluate the sound-cancelling effects of a tinnitus phase-out device over a 6-week period.

Main Methods:

• A comparative study involving 35 tinnitus patients (21 PTP, 14 NBNP).
• Phase-shift therapy administered using a tinnitus phase-out device for 6 weeks.
• Assessment via visual analogue scales (VAS), tinnitus questionnaire, hyperacusis questionnaire, Beck depression inventory, categorical scale, and audiometry.

Main Results:

• No significant VAS differences were observed in NBNP after therapy.
• PTP demonstrated a statistically significant increase in tinnitus loudness (p = 0.002) and annoyance (p = 0.014).
• Phase-shifting did not achieve significant sound cancellation in either patient group.

Conclusions:

• Phase-shift therapy, as implemented, was ineffective for tinnitus sound cancellation.
• The therapy exacerbated tinnitus symptoms in pure tone tinnitus patients.
• Further research is needed to understand the mechanisms and potential applications of phase-shift therapy in tinnitus management.