Reversed behaviour of masking at low levels.
Recent misinterpretations [Nelson, 1979] of an earlier paper [Zwicker, 1954] are corrected and measurements were repeated in more detail to show the reversal of masking with masker level more clearly: masking extends predominantly towards high frequencies for high levels; it extends, however, more towards low frequencies for low levels.
D006801:Humans; D010470:Perceptual Masking; D011571:Psychoacoustics