Perhaps this illusion is the result of an acoustic rather than physiological or cognitive phenomena. Record a sound from a musical instrument - something with a well defined harmonic signature -  and edit the recording to remove the fundamental.   Play the recording through a speaker, in an ordinary room (not an anechoic chamber) and  re-record it and examine the recording. Does the fundamental re-appear (at reduced amplitude) in the new recording? Has anyone tried this? Dave 
 |