The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
Rickye S. Heffner - One of the best experts on this subject based on the ideXlab platform.
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conditioned suppression avoidance as a procedure for testing hearing in birds the domestic Pigeon columba livia
Behavior Research Methods, 2013Co-Authors: Henry E. Heffner, Evan M Hill, Gimseong Koay, Rickye S. HeffnerAbstract:Although the domestic Pigeon is commonly used in learning experiments, it is a notoriously difficult subject in auditory psychophysical experiments, even those in which it need only respond when it detects a sound. This is because Pigeons tend to respond in the absence of sound—that is, they have a high false-positive rate—which makes it difficult to determine a Pigeon’s audiogram. However, false positives are easily controlled in the method of conditioned suppression/avoidance, in which a Pigeon is trained to peck a key to obtain food and to stop pecking whenever it detects a sound that signals impending electric shock. Here, we describe how to determine psychophysical thresholds in Pigeons using a method of conditioned suppression in which avoidable shock is delivered through a bead chain wrapped around the base of a Pigeon’s wings. The resulting audiogram spans the range from 2 to 8000 Hz; it falls approximately in the middle of the distribution of previous Pigeon audiograms and supports the finding of Kreithen and Quine (Journal of Comparative Physiology 129:1–4, 1979) that Pigeons hear infrasound.
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Conditioned suppression/avoidance as a procedure for testing hearing in birds: The domestic Pigeon (Columba livia)
Behavior Research Methods, 2012Co-Authors: Henry E. Heffner, Evan M Hill, Gimseong Koay, Rickye S. HeffnerAbstract:Although the domestic Pigeon is commonly used in learning experiments, it is a notoriously difficult subject in auditory psychophysical experiments, even those in which it need only respond when it detects a sound. This is because Pigeons tend to respond in the absence of sound—that is, they have a high false-positive rate—which makes it difficult to determine a Pigeon’s audiogram. However, false positives are easily controlled in the method of conditioned suppression/avoidance, in which a Pigeon is trained to peck a key to obtain food and to stop pecking whenever it detects a sound that signals impending electric shock. Here, we describe how to determine psychophysical thresholds in Pigeons using a method of conditioned suppression in which avoidable shock is delivered through a bead chain wrapped around the base of a Pigeon’s wings. The resulting audiogram spans the range from 2 to 8000 Hz; it falls approximately in the middle of the distribution of previous Pigeon audiograms and supports the finding of Kreithen and Quine (Journal of Comparative Physiology 129:1–4, 1979) that Pigeons hear infrasound.
Henry E. Heffner - One of the best experts on this subject based on the ideXlab platform.
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conditioned suppression avoidance as a procedure for testing hearing in birds the domestic Pigeon columba livia
Behavior Research Methods, 2013Co-Authors: Henry E. Heffner, Evan M Hill, Gimseong Koay, Rickye S. HeffnerAbstract:Although the domestic Pigeon is commonly used in learning experiments, it is a notoriously difficult subject in auditory psychophysical experiments, even those in which it need only respond when it detects a sound. This is because Pigeons tend to respond in the absence of sound—that is, they have a high false-positive rate—which makes it difficult to determine a Pigeon’s audiogram. However, false positives are easily controlled in the method of conditioned suppression/avoidance, in which a Pigeon is trained to peck a key to obtain food and to stop pecking whenever it detects a sound that signals impending electric shock. Here, we describe how to determine psychophysical thresholds in Pigeons using a method of conditioned suppression in which avoidable shock is delivered through a bead chain wrapped around the base of a Pigeon’s wings. The resulting audiogram spans the range from 2 to 8000 Hz; it falls approximately in the middle of the distribution of previous Pigeon audiograms and supports the finding of Kreithen and Quine (Journal of Comparative Physiology 129:1–4, 1979) that Pigeons hear infrasound.
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Conditioned suppression/avoidance as a procedure for testing hearing in birds: The domestic Pigeon (Columba livia)
Behavior Research Methods, 2012Co-Authors: Henry E. Heffner, Evan M Hill, Gimseong Koay, Rickye S. HeffnerAbstract:Although the domestic Pigeon is commonly used in learning experiments, it is a notoriously difficult subject in auditory psychophysical experiments, even those in which it need only respond when it detects a sound. This is because Pigeons tend to respond in the absence of sound—that is, they have a high false-positive rate—which makes it difficult to determine a Pigeon’s audiogram. However, false positives are easily controlled in the method of conditioned suppression/avoidance, in which a Pigeon is trained to peck a key to obtain food and to stop pecking whenever it detects a sound that signals impending electric shock. Here, we describe how to determine psychophysical thresholds in Pigeons using a method of conditioned suppression in which avoidable shock is delivered through a bead chain wrapped around the base of a Pigeon’s wings. The resulting audiogram spans the range from 2 to 8000 Hz; it falls approximately in the middle of the distribution of previous Pigeon audiograms and supports the finding of Kreithen and Quine (Journal of Comparative Physiology 129:1–4, 1979) that Pigeons hear infrasound.
Ben Peeters - One of the best experts on this subject based on the ideXlab platform.
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A comparative infection study of Pigeon and avian paramyxovirus type 1 viruses in Pigeons: evaluation of clinical signs, virus shedding and seroconversion
Avian Pathology, 2011Co-Authors: Jos Dortmans, Guus Koch, Peter Rottier, Ben PeetersAbstract:The pathogenesis of Pigeon paramyxovirus type 1 (PPMV-1) isolate AV324/96 and of its recombinant derivative, rgAV324, was studied in Pigeons. For comparison the virulent chicken virus FL-Herts, which is a recombinant derivative of strain Herts/33, was also included. After inoculation by the combined intraocular, intranasal and intratracheal route, clinical signs, virus shedding and serological responses were examined. Clinical symptoms were only observed in the FL-Herts infected group. All virus-inoculated Pigeons had positive tracheal swabs until 5 days post infection. However, only the AV324/96 and rgAV324 infected birds, and not the FL-Herts infected animals, shed virus in the cloaca. The AV324/96 infected Pigeons showed higher mean antibody titres than the rgAV324 infected animals, whereas the antibody titres of the FL-Herts infected group were rather low. The results show that the Pigeon strain AV324 is not virulent for Pigeons, but underlines the potential risk of poultry becoming infected by PPMV-1 shed by non-symptomatic Pigeons.
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a comparative infection study of Pigeon and avian paramyxovirus type 1 viruses in Pigeons evaluation of clinical signs virus shedding and seroconversion
Avian Pathology, 2011Co-Authors: Jos Dortmans, Guus Koch, Peter Rottier, Ben PeetersAbstract:The pathogenesis of Pigeon paramyxovirus type 1 (PPMV-1) isolate AV324/96 and of its recombinant derivative, rgAV324, was studied in Pigeons. For comparison, the virulent chicken virus FL-Herts, which is a recombinant derivative of strain Herts/33, was also included. After inoculation by the combined intraocular, intranasal and intratracheal route, clinical signs, virus shedding and serological responses were examined. Clinical signs were observed only in the FL-Herts-infected group. All virus-inoculated Pigeons had positive tracheal swabs until 5 days post infection. However, only the AV324/96-infected and rgAV324-infected birds, and not the FL-Herts-infected birds, shed virus in the cloaca. The AV324/96-infected Pigeons showed higher mean antibody titres than the rgAV324-infected birds, whereas the antibody titres of the FL-Herts-infected group were rather low. The results show that the Pigeon strain AV324 is not virulent for Pigeons, but underlines the potential risk of poultry becoming infected by PPMV-1 shed by non-symptomatic Pigeons.
Markus Freick - One of the best experts on this subject based on the ideXlab platform.
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Prevalence of Pigeon rotavirus infections: animal exhibitions as a risk factor for Pigeon flocks.
Archives of virology, 2020Co-Authors: Maxi Harzer, Michael Sieg, Kristin Heenemann, Thomas W. Vahlenkamp, Markus Freick, Antje RücknerAbstract:A total of 289 cloacal swabs from Pigeons from 29 different breeders in Germany were collected. In addition, samples from Pigeons exhibited at shows were collected. The detailed health status of the Pigeon flocks was recorded. Samples were analysed for the presence of the recently discovered Pigeon rotavirus and Pigeon circovirus. Pigeon rotavirus was found in 10.3% and Pigeon circoviruses was found in 65.5% of sampled Pigeon lofts. The study revealed a strong relationship between the attendance of shows and the occurrence of different clinical signs. The higher prevalence of Pigeon rotavirus in exhibited animals indicates that exhibitions are a risk factor for the transmission of this pathogen.
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Rapid detection of Pigeon herpesvirus, fowl adenovirus and Pigeon circovirus in young racing Pigeons by multiplex PCR.
Journal of virological methods, 2008Co-Authors: Markus Freick, Hermann Müller, Rüdiger RaueAbstract:Infections of young racing Pigeons with Pigeon herpesvirus (PiHV), fowl adenovirus (FAdV) and Pigeon circovirus (PiCV) are reported frequently. The role of these viruses in the pathogenesis of a disease complex called young Pigeon disease syndrome (YPDS) is generally accepted. All of these viruses cause inclusion bodies in the liver so liver samples are particularly useful for the detection of infection. Consequently a multiplex polymerase chain reaction (PCR) was developed for the detection of PiHV, FAdV and PiCV in liver samples from racing Pigeons. The detection limits were 10(1) genome equivalents for the detection of PiHV and PiCV and 10(3) genome equivalents for FAdV. The absence of PCR inhibitors was shown by the detection of cytochrome B gene as an internal control. No PCR products were amplified from related herpes and circoviruses or negative controls, demonstrating the specificity of the multiplex PCR. The addition of cellular DNA from liver samples or Q-solution to the reaction mix had no influence on its sensitivity. The usefulness of the multiplex PCR was demonstrated by re-investigation of liver samples from young racing Pigeons previously tested positive by uniplex PCRs.
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A disease complex associated with Pigeon circovirus infection, young Pigeon disease syndrome.
Avian pathology : journal of the W.V.P.A, 2005Co-Authors: Rüdiger Raue, Erhard F. Kaleta, Hermann J Muller, Volker Schmidt, Reimar Johne, Markus Freick, Brinja Reinhardt, Ludger Kamphausen, Maria-elisabeth Krautwald-junghannsAbstract:In order to collect more convincing data on the aetiological agent of young Pigeon disease syndrome (YPDS), a comprehensive study was performed on Pigeons in German lofts with or without outbreaks of YPDS. The investigations included examination of histories, clinical signs and pathology, as well as parasitological and microbiological analysis. Pigeons in their 4th to 12th week of life exhibited clinical signs at higher frequency and with greater severity than Pigeons of other ages. Greenish liquid in the crop, proventriculus and ventriculus, and yellow fluid in the small intestine were seen more often in YPDS-affected Pigeons. Escherichia coli and Klebsiella pneumoniae were isolated more frequently from these birds. Depletion of splenic and bursal lymphocytes was only seen in Pigeons with YPDS. Inclusion bodies were present in various organs, especially the bursa of Fabricius. The genome of Pigeon circovirus was detected in lymphoid tissues from all Pigeons with YPDS. The results of this study indicate that YPDS is a multifactorial disease in which Pigeon circovirus might be a crucial factor, possibly by inducing immunosuppression in infected birds.
Evan M Hill - One of the best experts on this subject based on the ideXlab platform.
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conditioned suppression avoidance as a procedure for testing hearing in birds the domestic Pigeon columba livia
Behavior Research Methods, 2013Co-Authors: Henry E. Heffner, Evan M Hill, Gimseong Koay, Rickye S. HeffnerAbstract:Although the domestic Pigeon is commonly used in learning experiments, it is a notoriously difficult subject in auditory psychophysical experiments, even those in which it need only respond when it detects a sound. This is because Pigeons tend to respond in the absence of sound—that is, they have a high false-positive rate—which makes it difficult to determine a Pigeon’s audiogram. However, false positives are easily controlled in the method of conditioned suppression/avoidance, in which a Pigeon is trained to peck a key to obtain food and to stop pecking whenever it detects a sound that signals impending electric shock. Here, we describe how to determine psychophysical thresholds in Pigeons using a method of conditioned suppression in which avoidable shock is delivered through a bead chain wrapped around the base of a Pigeon’s wings. The resulting audiogram spans the range from 2 to 8000 Hz; it falls approximately in the middle of the distribution of previous Pigeon audiograms and supports the finding of Kreithen and Quine (Journal of Comparative Physiology 129:1–4, 1979) that Pigeons hear infrasound.
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Conditioned suppression/avoidance as a procedure for testing hearing in birds: The domestic Pigeon (Columba livia)
Behavior Research Methods, 2012Co-Authors: Henry E. Heffner, Evan M Hill, Gimseong Koay, Rickye S. HeffnerAbstract:Although the domestic Pigeon is commonly used in learning experiments, it is a notoriously difficult subject in auditory psychophysical experiments, even those in which it need only respond when it detects a sound. This is because Pigeons tend to respond in the absence of sound—that is, they have a high false-positive rate—which makes it difficult to determine a Pigeon’s audiogram. However, false positives are easily controlled in the method of conditioned suppression/avoidance, in which a Pigeon is trained to peck a key to obtain food and to stop pecking whenever it detects a sound that signals impending electric shock. Here, we describe how to determine psychophysical thresholds in Pigeons using a method of conditioned suppression in which avoidable shock is delivered through a bead chain wrapped around the base of a Pigeon’s wings. The resulting audiogram spans the range from 2 to 8000 Hz; it falls approximately in the middle of the distribution of previous Pigeon audiograms and supports the finding of Kreithen and Quine (Journal of Comparative Physiology 129:1–4, 1979) that Pigeons hear infrasound.
