Glossary beginning with H

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

H

habituation

"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]


References

harmonic

"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]


References

harp

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


References

hearing

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]


References

  1. Pumphrey RJ. Hearing in Insects. Biological Reviews. 1940;15(1):107 - 132. Available at: http://www.blackwell-synergy.com/toc/brv/15/1.
hemisyllable

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]


References

Hertz

Hz

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


References

high-pass filter

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


References

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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