Detection of oscillating target movements by echolocation in the Greater Horseshoe bat

  title={Detection of oscillating target movements by echolocation in the Greater Horseshoe bat},
  author={Hans-Ulrich Schnitzler and Erwin Flieger},
  journal={Journal of comparative physiology},
SummaryThe abilities of 11 Greater Horseshoe bats (Rhinolophus ferrumequinum) to discriminate an oscillating from a stationary target by evaluating Doppler shifts in the echoes were studied in a two-alternative forced-choice procedure. At oscillation frequencies (fosc) from 5–30 Hz the best performing bat reached the threshold of 75% correct choices at approximately constant modulation depths of 60 Hz. Atfosc above 30 Hz the threshold modulation depths decreased with increasingfosc down to only… 

Echolocation sounds and hearing of the greater Japanese horseshoe bat (Rhinolophus ferrumequinum nippon)

  • I. Taniguchi
  • Materials Science
    Journal of Comparative Physiology A
  • 2004
The relationship between the orientation sounds and hearing sensitivity in the greater Japanese horseshoe bat,hinolophus ferrumequinum nippon, was studied and Audiograms showed remarkable sharp cut-offs on both sides near the BF.

Discrimination performance and echolocation signal integration requirements for target detection and distance determination in the CF/FM bat,Noctilio albiventris

Bats were trained to detect the presence of a target or to discriminate differences in target distance by means of echolocation and under conditions of continuous white noise, the bats increased their pulse repetition rate and the relative proportion of CF/FM pulses.

Discrimination of fluttering targets by the FM-batPipistrellus stenopterus?

Five bats of the species Pipistrellus stenopterus were trained in a two-alternative forced-choice procedure to discriminate between two fluttering targets, comparable to that of bats emitting longer sounds with constant-frequency (CF) components and a higher duty cycle.

Detection of frequency modulation in the FM-bat Phyllostomus discolor

In a two-alternative forced-choice procedure lesser spear-nosed bats, Phyllostomus discolor, has a pronounced capability for frequency discrimination which might be related to the extensive use of individually distinct frequency-modulated communication calls and audio-vocal learning.

Echolocation sound features processed to provide distance information in the CF/FM bat,Noctilio albiventris: evidence for a gated time window utilizing both CF and FM components

These findings indicate that Noctilio albiventris uses both the CF and FM components of its short-CF/FM echolocation sound for distance discrimination, within a fairly broad frequency range, as long as the frequencies of theCF and the beginning of the FM sweep are nearly identical.

Discrimination of insect wingbeat-frequencies by the batRhinolophus ferrumequinum

The results show that Greater Horseshoe bats can determine the wingbeat rate of flying insects with an accuracy between 6 and 12%.

Frequency tuning and latency organization of responses in the inferior colliculus of Japanese house bat, Pipistrellus abramus.

Electrophysiological measures suggest the importance of a target distance within approximately 3 m, which is consistent with behavioral measures during foraging in this species.

Fluttering target detection in Hipposiderid bats

SummaryTwo species of Hipposiderid bats,Hiposideros speoris andH. lankadiva, which both emit short CF-FM echolocation calls, were trained in a two-alternative forced-choice procedure to discriminate

Coding of sinusoidally amplitude modulated acoustic stimuli in the inferior colliculus of the rufous horseshoe bat,Rhinolophus rouxi

  • K. Reimer
  • Biology
    Journal of Comparative Physiology A
  • 2004
The results did not reveal any significant specialization of the bat's auditory system for coding of amplitude modulations as compared to other mammals.

Discrimination of wingbeat motion by bats, correlated with echolocation sound pattern

Behavioral evidence is provided supporting the hypothesis that bats that use CF/FM echolocation sounds have adaptations for the perception of insect wingbeat motion and that long-CF/FM species are more specialized for this task than short-CF-FM species.



Control of doppler shift compensation in the greater horseshoe bat,Rhinolophus ferrumequinum

SummaryFlyingRhinolophus ferrumequinum lower the frequency of the constant frequency part (fA) of the emitted sounds in order to compensate for Doppler shifts caused by the flight speed. The echo

Response of the Doppler echolocation system in the bat, Rhinolophus ferrumequinum.

  • J. Simmons
  • Physics
    The Journal of the Acoustical Society of America
  • 1974
An electronic target simulator was used to produce artificial echoes for the echolocating bat, Rhinolophus ferrumequinum, and it changed the frequency of the constant‐frequency portions of its outgoing orientation sounds to restore the CF portions of returning echoes to the bat's preferred frequency.

Response to frequency shifted artificial echoes in the batRhinolophus ferrumequinum

SummaryIn 5 roosting bats the resting frequency, that is the mean frequency of the cf-portion of consecutive sounds, is kept constant with a standard deviation which varies between 30–120 Hz in

Echoortung bei der Fledermaus Chilonycteris rubiginosa

  • H. Schnitzler
  • Physics
    Zeitschrift für vergleichende Physiologie
  • 2004
SummaryChilonycteris rubiginosa (CR) produces tripartite ultrasonic sounds in all orientation situations. During the first part the frequency rises by 1–2 kHz. The following middle part has a

Adaptations for the Detection of Fluttering Insects by Echolocation in Horseshoe Bats

Comparative studies on echolocation in various species of bats reveal differences in the design of transmitters — i.e., the vocal systems producing different echolocation signals — as well as

Doppler-shift compensation in insect-catching horseshoe bats

The free run establishes that the bat rhythm is circadian in nature and the entrainment was exclusively due to the dim light that came in before the plugging.

Die Ultraschall-Ortungslaute der Hufeisen-Fledermäuse (Chiroptera-Rhinolophidae) in verschiedenen Orientierungssituationen

  • H. Schnitzler
  • Physics
    Zeitschrift für vergleichende Physiologie
  • 2004
SummaryEcholocating Rhinolophus ferrum-equinum (RF) and Rhinolophus euryale (RE) produce ultrasonic pulses which always consist of three parts. In the initial part the frequency rises by 1–12 KHz

The Acoustical Image of Fluttering Insects in Echolocating Bats

Behavioral studies indicate that echolocation also enables bats to obtain information on other target features which they can use to distinguish different targets and perhaps even to identify behaviorally relevant targets.

Auditory Processing of Echoes: Peripheral Processing

In mammals sounds hitting the ear release a travelling wave on the Basilar Membrane (BM). The BM acts as a bank of mechanical low pass filters where high sound frequencies produce a maximal wave

Organizational and Encoding Features of Single Neurons in the Inferior Colliculus of Bats

This chapter tries to bridge the intervening gap by reviewing the results obtained from experiments on the inferior colliculus of the long CF/FM mustache bat.