Musical Emotion Categorization with Vocoders of Varying Temporal and Spectral Content.
Eleanor E Harding, Etienne Gaudrain, Imke J Hrycyk and 5 others
PMID 36628512WHAT IT FOUND
Normal-hearing listeners categorizing vocoded music recognized high-arousal emotions like joy and fear much better than low-arousal ones like sadness and serenity.
Temporal clarity improved recognition of both, but spectral clarity alone did not help distinguish positive from negative emotions.
Key findings
01Participants identified high-arousal emotions (joy and fear) with significantly higher sensitivity than low-arousal emotions (serenity and sadness).
02Vocoder conditions with better temporal content (sinewave carriers) yielded higher emotion categorization sensitivity than those with noise carriers.
03Valence (positive vs. negative emotion) was transmitted poorly in all vocoded conditions, regardless of spectral filter order, unless temporal content was also high.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study used normal-hearing listeners and vocoders to simulate cochlear implant hearing, not actual CI users. The vocoder parameters (16 channels, specific filter orders) represent only a limited range of possible CI signal processing strategies. Musical background varied among participants, though supplementary analysis showed no significant difference in sensitivity between musicians and non-musicians. The task measured recognition of intended emotion, not the emotion actually felt by the listener.
Declared interests
The authors declared no potential conflicts of interest. The study was funded by the Dorhout Mees Foundation, the Gratama Foundation, Heinsus Houbolt Funds, and NWO/ZonMw grants.
The easy way to misread this
Do not assume that improving spectral resolution in cochlear implants will significantly help users distinguish between happy and sad music. This study found that temporal clarity was the dominant factor in emotion recognition, and spectral improvements alone had little effect on valence perception.