During 1959–1965, research converged on treating prosody as an integrated, multi-channel code in which fundamental frequency, amplitude, and duration jointly signal intonation and stress across languages. Onset timing and voicing contrasts emerged as central cues for differentiating speech events and articulatory actions, guiding experimental designs and early perceptual judgments. Measurement innovations such as cinefluorography and electromyography began to connect articulation with acoustic output, while binaural psychoacoustics offered a practical framework for understanding perceptual masking and separability; physiological state, including aging and laryngeal factors, modulated pitch and voice quality measures. Historical Significance: These developments established core prosodic cues and cross-language voicing patterns that underpinned later theories of perception, speech processing, and prosodic rhythm. The introduction of articulatory-to-acoustic linkage methods and measurement tools created enduring datasets and methodologies that influenced multimodal phonetics and intelligibility research. Foundational studies on vowel duration, word stress cues, and cross-language voicing provided benchmarks for future research in speech synthesis, language processing, and hearing sciences.