Physiological thresholds can differ from behavioral thresholds by ±15–20 dB HL. Thus, without verification of behavioral responses with amplification, hearing aids may underamplify or overamplify.

[…]and the dog came after, and umbecast about, for she had lost the very perfect feute of the hind.

The studded bridle on a ragged bough Nimbly she fastens: -- O, how quick is love! -- The steed is stalled up, and even now To tie the rider she begins to prove: Backward she push'd him, as she would be thrust, And govern'd him in strength, though not in lust.

So he scraped and scratched and scrabbled and scrooged, then he scrooged again[.]