Touch Helps Hearing: Evidence From Continuous Audio-Tactile Stimulation.
Xueying Fu, Fren T Y Smulders, Lars Riecke
PMID 39680490WHAT IT FOUND
Continuous tactile vibration on the arm, timed in phase with a sound's rhythm, lowered the threshold for detecting a tone in noise by less than 1 dB.
This effect was small and did not appear in a loudness discrimination task.
Key findings
01In-phase continuous tactile stimulation significantly reduced the auditory detection threshold compared to auditory-alone conditions, indicating improved perception.
02The observed improvement in auditory detection was not due to a response bias, as false alarm rates did not differ significantly between tactile and auditory-alone conditions.
03Experiment 1 found no behavioral benefit from tactile stimulation on a loudness discrimination task, despite EEG showing enhanced neural responses to the tone.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The behavioral benefit in Experiment 2 was very small (less than 1 dB), which may not be clinically meaningful. Experiment 1 and Experiment 2 used different participants, so the link between the neural enhancement seen in Exp 1 and the behavioral benefit in Exp 2 is not directly established. EEG scalp recordings have low spatial resolution, making it difficult to definitively attribute neural changes to auditory cortex versus somatosensory areas. Participants had normal hearing, so results may not generalize to individuals with hearing impairments.
Declared interests
The work was supported by Maastricht University and the China Scholarship Council. No commercial conflicts of interest were declared.
The easy way to misread this
Do not assume that adding tactile vibration to hearing aids will significantly improve speech recognition in noise. The study found only a less than 1 dB improvement in detection threshold in a basic lab task, with no benefit in a discrimination task, and the participants had normal hearing.