Glossary beginning with H

Click one of the letters above to go to the page of all terms beginning with that letter.



"Upon continual exposure to a signal, an animal will tend to ignore it, and some of the animal’s neurons will cease to fire." [1]



"A note whose frequency is an integral multiple of the fundamental frequency. This is only true of an idealized system. In real circumstances the harmonics diverge from the inegral values to a varying extent." [1]



"An area of clear membrane in the male fore wings of true crickets and mole-crickets, similar in shape to the musical instrument." [1]



The ability of organism to sense sound.

"An insect will be said to hear when it is demonstrably responsive to sound." [1]

"...the only distinction made between hearing and the tactile senses is based on the intensity factor and is quite arbitrary. Atthepresenttimenoconfusionarisesinpracticebecausethesensitivity of the auditory organs so far investigated is of a different order from the sensitivity of end-organs usually regarded as tactile. But the distinction is not fundamental, and it can be regarded as certain that further work will demonstrate the existence of end-organs intermediate in sensitivity between “hearing” and “tactile” end-organs. There will then be no justification for attempting a sharp separation." [1]


  1. Pumphrey RJ. Hearing in Insects. Biological Reviews. 1940;15(1):107 - 132. Available at:

The sound produced by a to- OR fro- movement of the stridulatory apparatus.

Broughton (1963) took the view that this term should only apply to either of the components of a diplosyllable, preferring the term haplosyllable for syllables where either the to or fro motion was silent. Later authors (e.g. Ragge & Reynolds, 1998) often replace haplosyllable with hemisyllable.

"The sound produced by one unidirectional movement (opening, closing, upward or downward) of the fore wings or hind legs." [1]




"The SI unit of frequency. The number of cycles per second." [1]


high-pass filter

"A circuit (electronic or neuronal) which only permits the transmission of high-frequency signals." [1]


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Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith