What does the Speech Detection Threshold (SDT) measure?

The Speech Detection Threshold (SDT) specifically measures the lowest intensity level at which an individual can detect the presence of a speech signal. This threshold indicates the faintest sound level at which a person can recognize that speech is occurring, even if they may not fully understand the words being spoken. SDT is an essential assessment in audiology, particularly for individuals with hearing impairments, as it helps professionals determine the minimum sound level required for a patient to perceive speech.

When comparing SDT to other potential measures, it's crucial to understand that while some assessments focus on speech comprehension or the ability to repeat words, SDT strictly assesses detection rather than understanding or response to speech. Other answer choices, such as measuring the highest volume level someone can tolerate or averaging hearing levels at various frequencies, do not align with the specific purpose of SDT. Therefore, option B accurately encompasses the definition and intent behind measuring the Speech Detection Threshold.