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dc.contributor.advisorSmotherman, Michaelen_US
dc.creatorSchwartz, Christine Patriceen_US
dc.date.accessioned2012-02-14T22:18:24Zen_US
dc.date.accessioned2012-02-16T16:19:03Z
dc.date.available2012-02-14T22:18:24Zen_US
dc.date.available2012-02-16T16:19:03Z
dc.date.created2010-12en_US
dc.date.issued2012-02-14en_US
dc.date.submittedDecember 2010en_US
dc.identifier.urihttp://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8745en_US
dc.description.abstractVocal plasticity is presumed to be a key element underlying the evolution of human speech and language, but the mechanisms and neuroanatomical basis for this plasticity remain largely unknown. The Mexican free-tailed bat, Tadarida brasiliensis, presents a unique opportunity to advance our understanding of the evolution and neurobiology of mammalian vocal communication because this animal displays elements of vocal complexity and plasticity that are more sophisticated than any mammal other than humans, including non-human primates. Current models of vocal control in mammals do not account for the vocal complexity of free-tailed bats. The purpose of this dissertation is to fill that gap in knowledge by identifying a possible neuronal basis for vocal complexity in free-tailed bats. This will be achieved by 1) providing a detailed analysis of the free-tailed bat’s vocal behaviors, 2) mapping the distribution of neurotransmitter receptor types suspected of involvement in vocal control, 3) identifying brain regions that exhibit increased neuronal activity during vocalizing, and 4) pharmacologically manipulating putative vocal control regions to confirm and characterize their function in vocalizing. Analysis of Tadarida’s vocal behavior indicated that they have a vast vocal repertoire, including many different call types, context-dependent sensory-feedback driven vocal plasticity, and syntactically-organized stereotyped songs. Their vocal behavior changed seasonally, so I mapped the distribution of melatonin binding sites in the brain, finding high densities in the striatum, similar to dopamine receptor distribution. I then used immunohistochemical labeling of the immediate early gene cfos to map neuronal activation in brains of highly vocal bats to find ROIs activated by vocal production. This technique not only identified all previously known regions of the mammalian vocal motor pathway but also revealed activity in novel brain regions that could potentially account for vocal plasticity, including a localized region of the basal ganglia, the dorsolateral caudate nucleus, and the anterior cingulate region of the frontal cortex. Pharmacological excitation of these regions evoked complex vocal sequences similar to the songs recorded in the field and lab. These results support the hypothesis that the mammalian basal ganglia may play a crucial role in the plasticity and complexity of mammalian vocal behaviors.en_US
dc.format.mimetypeapplication/pdfen_US
dc.language.isoen_USen_US
dc.subjectvocal motor pathwayen_US
dc.subjectvocalizationen_US
dc.subjectbatsen_US
dc.subjectc-fosen_US
dc.subjectanterior cingulate cortexen_US
dc.subjectcaudate nucleusen_US
dc.subjectsongen_US
dc.titleNeurobiology of Bat Vocal Behavioren_US
dc.typeThesisen
thesis.degree.departmentBiologyen_US
thesis.degree.disciplineZoologyen_US
thesis.degree.grantorTexas A&M Universityen_US
thesis.degree.nameDoctor of Philosophyen_US
thesis.degree.levelDoctoralen_US
dc.contributor.committeeMemberCassone, Vincenten_US
dc.contributor.committeeMemberLints, Thierryen_US
dc.contributor.committeeMemberHull, Rachelen_US
dc.type.genrethesisen_US
dc.type.materialtexten_US


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