Final answer:
Voice-pitch analysis is true; it studies the changes in pitch of the human voice, which vary with the relaxation or tightening of the larynx muscles affecting the vocal cords and thus altering frequency.
Step-by-step explanation:
The statement that analysis examining changes in the relative frequency of the human voice that accompany emotional arousal is called voice-pitch analysis is true. The human voice changes pitch by relaxing or tightening the muscles of the larynx, which changes the tension on the vocal cords. When these muscles tighten, the pitch goes up, and when they relax, the pitch goes down. The frequency of the sound waves produced by the vocal cords is what we perceive as pitch. High-frequency sounds are perceived as high-pitched whereas low-frequency sounds are perceived as low-pitched. Our auditory system differentiates various pitches by identifying the frequency of the sound waves.
The perception of frequency is known as pitch, which is an important aspect of human communication, allowing us to detect nuances in speech and music. In the context of emotional arousal, pitch analysis can be particularly insightful, as pitch can vary unintentionally under different emotional states.