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Full-Text Articles in Neuroscience and Neurobiology
The Retrograde Spread Of Synaptic Potentials And Recruitment Of Presynaptic Inputs, Brian L. Antonsen, Jens Herberholz, Donald H. Edwards
The Retrograde Spread Of Synaptic Potentials And Recruitment Of Presynaptic Inputs, Brian L. Antonsen, Jens Herberholz, Donald H. Edwards
Neuroscience Institute Faculty Publications
Lateral excitation is a mechanism for amplifying coordinated input to postsynaptic neurons that has been described recently in several species. Here, we describe how a postsynaptic neuron, the lateral giant (LG) escape command neuron, enhances lateral excitation among its presynaptic mechanosensory afferents in the crayfish tailfan. A lateral excitatory network exists among electrically coupled tailfan primary afferents, mediated through central electrical synapses. EPSPs elicited inLGdendrites as a result of mechanosensory stimulation spread antidromically back through electrical junctions to unstimulated afferents, summate with EPSPs elicited through direct afferent-to-afferent connections, and contribute to recruitment of these afferents. Antidromic potentials are larger if …
A Lateral Excitatory Network In The Escape Circuit Of Crayfish, Jens Herberholz, Brian L. Antonsen, Donald H. Edwards
A Lateral Excitatory Network In The Escape Circuit Of Crayfish, Jens Herberholz, Brian L. Antonsen, Donald H. Edwards
Neuroscience Institute Faculty Publications
A phasic stimulus directed to the rear of a crayfish (Procambarus clarkii) creates mechanosensory input to the lateral giant (LG) interneuron, a command neuron for escape. A single LG spike is necessary and sufficient to produce a highly stereotyped tail flip that thrusts the animal away from the source of stimulation. Here we describe a lateral excitatory network among primary afferent axons in the last abdominal ganglion of crayfish that produces nonlinear amplification of the sensory input to the command circuitry for escape. The lateral excitation is mediated by electrical synapses between central terminals of primary mechanosensory afferents. The network …
Patterns Of Neural Circuit Activation And Behavior During Dominance Hierarchy Formation In Freely Behaving Crayfish, Jens Herberholz, Fadi A. Issa, Donald H. Edwards
Patterns Of Neural Circuit Activation And Behavior During Dominance Hierarchy Formation In Freely Behaving Crayfish, Jens Herberholz, Fadi A. Issa, Donald H. Edwards
Neuroscience Institute Faculty Publications
Creation of a dominance hierarchy within a population of animals typically involves a period of agonistic activity in which winning and losing decide relative positions in the hierarchy. Among crayfish, fighting between size-matched animals leads to an abrupt change of behavior as the new subordinate retreats and escapes from the attacks and approaches of the dominant (Issa et al., 1999). We used high-speed videography and electrical recordings of aquarium field potentials to monitor the release of aggressive and defensive behavior, including the activation of neural circuits for four different tail-flip behaviors. We found that the sequence of tail-flip circuit excitation …
Neuronal Adaptations To Changes In The Social Dominance Status Of Crayfish, Shih-Rung Yeh, Barbara E. Musolf, Donald H. Edwards
Neuronal Adaptations To Changes In The Social Dominance Status Of Crayfish, Shih-Rung Yeh, Barbara E. Musolf, Donald H. Edwards
Neuroscience Institute Faculty Publications
The effect of superfused serotonin (5-HT; 50 mM) on the synaptic responses of the lateral giant (LG) interneuron in crayfish was found to depend on the social status of the animal. In socially isolated animals, 5-HT persistently increased the response of LG to sensory nerve shock. After social isolates were paired in a small cage, they fought and determined their dominant and subordinate status. After 12 d of pairing, 5-HT reversibly inhibited the response of LG in the social subordinate and reversibly increased the response of LG in the social dominant crayfish. The effect of 5-HT changed approximately linearly from …