At what frequency does understanding speech generally peak according to the importance of speech function?

Understanding speech generally peaks in the frequency range of 2000-3000 Hz due to the characteristics of human speech, which convey critical phonetic information necessary for comprehension. This frequency range includes many of the formants and consonant sounds that are essential for distinguishing different phonemes, especially those that are crucial for understanding speech clarity and intelligibility.

This area is particularly important because it carries signals that are vital for recognizing speech sounds like /s/, /sh/, and /t/, which play a significant role in the comprehension of language. The ability to discern these sounds is foundational for effective communication. Frequencies outside this range, while still relevant, do not carry as much of the critical information needed for understanding speech, making this frequency range particularly important for auditory processing and rehabilitation.