True or False: Low and extremely high frequencies require more intensity to be just barely audible compared to frequencies in the middle range.

The assertion is true that low and extremely high frequencies require more intensity to be just barely audible compared to frequencies in the middle range. This phenomenon is closely related to the human audiogram, which shows that human hearing sensitivity varies across different frequencies.

At very low frequencies (below around 200 Hz) and very high frequencies (above approximately 4000 Hz), the auditory system's sensitivity decreases. This makes it less sensitive to sounds in these ranges, which means that higher sound pressure levels (intensities) are necessary for individuals to perceive these frequencies at low volume levels.

In contrast, the frequencies in the middle range, typically around 1000 to 3000 Hz, are where human hearing is most sensitive. This is why most speech sounds, which predominantly fall into this mid-frequency range, can be heard easily even at lower intensities.

Understanding this concept is crucial for hearing aid fitting and adjustments, as programming hearing aids often involves enhancing amplification specifically for these less audible frequency ranges to ensure an optimal hearing experience for the user.