Acoustic spectral feedback in vocal learning: a systematic review of psychological mechanisms and skill outcomes
Abstract
Background: Vocal skill acquisition is inherently "invisible": learners cannot directly observe the movements of their vocal organs, so traditional instruction depends heavily on the teacher's auditory judgment and metaphorical language. This leaves learners ill-equipped to detect errors and self-correct during independent practice. Spectral and acoustic visualization technologies-pitch-trajectory displays, spectrograms, formant analysis, and physiological biofeedback-can externalize this hidden process, yet systematic synthesis at the level of psychological mechanisms remains scarce.
Aim: Using psychological mechanisms as its organizing framework, this review synthesizes the role of acoustic spectral feedback in vocal learning and seeks to bridge motor learning theory and self-regulated learning theory, which have not previously been integrated in this context.
Methods: Following PRISMA 2020, we systematically searched WoS, Scopus, PsycINFO, ERIC, PubMed, and CNKI (2005-2025). Using thematic narrative synthesis, we classified the 36 included studies by psychological mechanism rather than by tool type; only 7 reported a formal mediation test.
Results: The evidence revealed five mechanism pathways. Spectral feedback is associated with self-efficacy gains attributed to accumulated mastery experience via knowledge of results (relatively strong). It promotes metacognitive monitoring by externalizing implicit mechanisms (strong for measurement, but the metacognition→skill test…
How strong is the evidence?
Evidence Hub reads this as a systematic review. Its evidence level is 1 of 5 (Highest · pooled evidence). Pooled evidence from several studies sits at the top of the evidence pyramid.
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