Final answer:
The texture, or timbre, of sound is determined by its overtones and is what distinguishes different instruments playing the same note. Timbre is a subjective quality that describes the unique character of a sound.
Step-by-step explanation:
The complex pattern of overtones determines the texture, or timbre, of the sound. Timbre is described by terms such as dull, brilliant, warm, cold, pure, and rich and is affected by the frequency, amplitude, and timing of sound waves. This mix of the fundamental frequency and overtones gives musical instruments and human voices their distinctive sound characteristics.
The timbre of a sound distinguishes it from other sounds, such as when a violin and a piano both play middle C. The violin sounds different to the piano due to each instrument's distinctive set of frequencies and overtones. The consideration of timbre is an aspect of perceptual psychology, given its subjective nature and relation to how we psychologically perceive sound qualities.