00327nam a2200085 4500008004100000245007000041210006900111100002000180856004100200 1977 eng d00aOur Sonic Environment and The Soundscape: the tuning of the World0 aOur Sonic Environment and The Soundscape the tuning of the World1 aSchafer, Murray uhttps://bio.acousti.ca/es/node/5808502232nas a2200133 4500008004100000245013600041210006900177300001200246490000700258520175300265100001602018700002302034856004102057 1977 eng d00aFurther studies on the peripheral auditory system of 'CF-FM' bats specialized for fine frequency analysis of Doppler-shifted echoes0 aFurther studies on the peripheral auditory system of CFFM bats s a207-2320 v693 a

In the mustache bat (Pteronotus parnellii rubiginosus), the cochlear microphonic (CM) recorded from the round window is sharply tuned at 61 kHz and shows a prominent transient response to a tone burst at about 61 kHz (i.e. its amplitude increases exponentially at the onset of the stimulus and decreases at its cessation). In terms of the time constant (I-I + 0-3 ms) and the resonance frequency (6I*I + 0-43 kHz) of this transient response, the Q of this system, assumed to correspond to a second-order filter, is 204 + 57. Peripheral neurones sensitive to 61 kHz have a very sharp excitatory area (or tuning curve). The Q of a tuning curve markedly increases with the rise in best frequency up to 61 kHz and decreases beyond 61 kHz. The Q value of a single neurone with best frequencies between 60-76 and 61-75 kHz is 210189. If the assumption that the CM is directly related to the mechanical motion of the basilar membrane is correct, the very sharp tuning curves of single neurones at about 61 kHz could be simply due to the mechanical tuning of the basilar membrane. Since this animal predominantly uses a 61 kHz sound for echolocation and peripheral auditory neurones show a low threshold and extremely sharp tuning at about 61 kHz, its peripheral auditory system is specialized for the reception and fine-frequency analysis of the principle component of orientation sounds and echoes. Sharply tuned neurones can code a frequency modulation as small as o-oi%, so that the wing beat of an insect would be easily coded by them. Unlike the CM, Nx is tuned at 64 kHz. This difference in best frequency is simply due to the properties of a sharply tuned resonator and Nlt and not due to a mechanism comparable to lateral inhibition.

1 aSUGA, NOBUO1 aJEN, PHILIP, H.-S. uhttps://bio.acousti.ca/es/node/5797500310nas a2200109 4500008004100000245004000041210003900081300001200120490000600132100002000138856004200158 1977 eng d00aGrasshoppers of South-east Botswana0 aGrasshoppers of Southeast Botswana a139-1430 v91 aHouston, J.F.T. uhttp://www.jstor.org/stable/40979517 01298nas a2200133 4500008004100000245007600041210006900117300001000186490000700196520087700203100002401080700001901104856004101123 1977 eng d00aAcoustic Orientation in the Cricket Teleogryllus Oceanicus (Le Guillou)0 aAcoustic Orientation in the Cricket Teleogryllus Oceanicus Le Gu a61-750 v673 a

New information is presented on acoustic orientation in crickets following a comparison between as species with a discontinuous song pattern, Scapsepidus maginatus (Murphet & Zaretsky, 1972) and one with a continuous osng pattern, Teleogrylluys oceanicus. The females acuity for side discrimination is ±10° from the body axis whereas total phonokinetic response shows a greater degree of error. Females can scan their turn angle to target angles beneath 60°. Error is expressed in terms of information loss through the total behavioural sequence. The cricket does not orient while moving, requires no fixed leg position during the stop for effective orientation and can establish source direction on the basis of at least two syllables. Evidence of differential anterioir and posterior tympanic membrane function is suggested.

1 aBailey, Winston, J.1 aThomson, Peter uhttps://bio.acousti.ca/es/node/1720400518nas a2200133 4500008004100000022001400041245013200055210006900187260002000256300001400276490000700290100002200297856006500319 1977 eng d a0022-293300aA taxonomic study of the genus Thyridorhoptrum Rehn & Hebard (Orthoptera: Tettigoniidae), with the description of a new species0 ataxonomic study of the genus Thyridorhoptrum Rehn Hebard Orthopt cNov-28-20071978 a645 - 6590 v111 aPitkin, Linda, M. uhttp://www.tandfonline.com/doi/abs/10.1080/00222937700770561