What does the term "speech recognition threshold" (SRT) refer to?

Speech recognition threshold (SRT) is defined as the lowest intensity level at which an individual can accurately perceive and repeat back spoken words. This threshold provides valuable information about a person's auditory processing capabilities, particularly in understanding speech. SRT is typically measured using lists of spondee words—two-syllable words with equal stress on both syllables, such as "hot dog" or "baseball."

When clinicians perform SRT testing, they aim to determine the quietest level at which speech can be recognized and understood, reflecting the person's sensitivity to speech sounds. This threshold is crucial for developing effective audiological interventions, particularly in environments where speech needs to be distinguished from background noise.

The other options refer to different aspects of auditory perception but do not accurately define speech recognition threshold. For instance, the highest level at which sounds can be heard pertains to pure tone testing and is more related to sound detection rather than understanding. Comfortable listening volume relates to the range of sound that feels comfortable but does not involve recognition or comprehension of speech. Lastly, the ability to distinguish between different speech sounds is more aligned with phonemic awareness rather than the recognition threshold, which specifically focuses on the comprehension and repetition of words.