Stimulus specific adaptation in the hearing system of Neoconocephalus katydids (insecta: Orthoptera)
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[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Stimulus Specific Adaptation (SSA) is a fundamental response that identifies novel signals within a repetitive background noise. It is well characterized in the vertebrate auditory system, but has been studied only in a relatively small number of studies involving invertebrates. Neoconocephalus katydids have one auditory interneuron (TN-1) that can detect rare signals (e.g. bat cries) within a repetitive background (e.g. male calls). It is assumed that TN-1 produces SSA-like responses whenever the bat cries were detected, however no formal test (e.g. oddball design) for SSA was conducted. In this present study using an oddball design, TN-1 showed SSA with varying response strengths based on three variables. The variables included a low deviant probability (<50%), a large frequency separation (>0 octaves) and a fast pulse rate ([greater than or equal to] 25 Hz). The responses were also replicated across two Neoconocephalus species. As a result, this study fulfilled my aim to establish the katydid neuron as a good model to study SSA due to the similarities found in other katydids and mainly to the responses observed in the vertebrate neuron. Additionally, since many experimental approaches are performed in TN-1 from the cellular, molecular, and genetic level, this makes TN-1 an ideal candidate to further investigate the complexities of SSA at many levels.
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