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  • 1
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    Echo detection and target-ranging neurons in the auditory system of the bat Eptesicus fuscus (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-11-10
    Description: Some of the neurons in the nucleus intercollicularis and auditory cortex of the echolocating bat Eptesicus fuscus respond selectively to sonar echoes occurring with specific echo delays or pulse-echo intervals. They do not respond for a wide range of other types of sounds or for sonar echoes at longer or shorter pulse-echo intervals; they may, therefore, be specialized for detection and ranging of sonar targets.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Feng, A S -- Simmons, J A -- Kick, S A -- New York, N.Y. -- Science. 1978 Nov 10;202(4368):645-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/705350" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Auditory Cortex/physiology ; Auditory Perception/*physiology ; Chiroptera/*physiology ; Echolocation/*physiology ; Inferior Colliculi/physiology ; Neurons/physiology ; Orientation/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Perception of echo phase information in bat sonar (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-06-22
    Description: Echolocating bats (Eptesicus fuscus) can detect changes as small as 500 nanoseconds in the arrival time of sonar echoes when these changes appear as jitter or alternations in arrival time from one echo to the next. The psychophysical function relating the bat's performance to the magnitude of the jitter corresponds to the half-wave rectified cross-correlation function between the emitted sonar signals and the echoes. The bat perceives the phase or period structure of the sounds, which cover the 25- to 100-kilohertz frequency range, as these are represented in the auditory system after peripheral transformation. The acoustic image of a sonar target is apparently derived from time-domain or periodicity information processing by the nervous system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Simmons, J A -- New York, N.Y. -- Science. 1979 Jun 22;204(4399):1336-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/451543" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Auditory Perception/*physiology ; Chiroptera/*physiology ; Echolocation/*physiology ; Movement ; Orientation/*physiology ; Time Factors
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Echolocation and pursuit of prey by bats (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-01-05
    Description: Echolocating bats use different information-gathering strategies for hunting prey in open, uncluttered environments, in relatively open environments with some obstacles, and in densely cluttered environments. These situations differ in the extent to which individual targets such as flying insects can be detected as isolated objects or must be separated perceptually from backgrounds. Echolocating bats also differ in whether they use high-resolution, multidimensional images of targets or concentrate specifically on one particular target dimension, such as movement, to detect prey.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Simmons, J A -- Fenton, M B -- O'Farrell, M J -- New York, N.Y. -- Science. 1979 Jan 5;203(4375):16-21.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/758674" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Evolution ; Chiroptera/*physiology ; Echolocation/*physiology ; Environment ; Orientation/*physiology ; Predatory Behavior/physiology ; Species Specificity ; Ultrasonics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
    Electronic Resource
    Electronic Resource
    Peripheral auditory tuning for fine frequency analysis by the CF-FM bat,Rhinolophus ferrumequinum (1976)
    Springer
    Journal of comparative physiology 106 (1976), S. 99-110 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Rhinolophus ferrumequinum compensates for Doppler shifts and keeps the frequency of the CF-portion of echoes constant at a reference frequency. The bat's cochlea is specialised for the detection of sounds in a narrow range including this reference frequency. The threshold curve of the N1-on (summated activity of primary auditory neurons evoked at the onset of a tonal stimulus) has a sharp notch about 24–30 dB deep which is exactly tuned to the reference frequency. N1-off is most prominent at stimulus frequencies 0.5–1 kHz below the reference frequency. In this frequency range the envelopes of the CM (cochlear microphonics) have slower rise and decay times than the stimulus envelopes. A comparison of our physiological data with the morphological data of Bruns (1976a, b) leads to the suggestion that the cochlea acts as a narrowly-tuned mechanical filter which is responsible for sharp tuning of the CM, N1-on and N1-off threshold curves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00606575
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    Paper (German National Licenses)
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  • 5
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    Echo Detection and Target-Ranging Neurons in the Auditory System of the Bat Eptesicus fuscus (1978)
    American Association for the Advancement of Science
    Details
    Publication Date: 1978-11-10
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science
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