Control motor del comportamiento

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Transcripción de la presentación:

Control motor del comportamiento Seminario 8 Control motor del comportamiento

Neurona comando, criterios de identificación:

Simple reflex behaviors Complex- modifiable behaviors

Experimentos en todo el animal, preparación semi-intacta y en ganglios aislados

Cada una de las nueronas de un ganglio está Involucrada en múltiples comportamientos

Reflex vs. Serial model of behavioral choice An animal must use sensory information to inform its decisions about which form of which task to use if it is to achieve its current goal. How these decisions are made should be reflected in the neural architecture. At one extreme, decisions about goal, task, and form may be made independently, at separate neural locations. At the other extreme, sensory information could trigger one form of a task directly, with no overt choice about goal or task ever being made. Reflex vs. Serial model of behavioral choice

Ganglio subesofágico de la sangüijuela Fig1A Ganglio subesofágico de la sangüijuela (estereofotomicrografía para ver en 3D!) Command-like neurons in the SEG: initiate or terminate motor patterns (swimming, shortening, crawling?)

R3b1

Qué factores determinan que se haga uno o lo otro? Inyección I en R3b1: Fig2 fictive crawling fictive swimming C(ircular)V motor neuron, ganglio 10: CV 10 Bursts resultan en elongación de la sanguijuela DP 10: nervio, se ven spikes de cell 3 (dorsal longitudinal motor neuron) : contracción Qué factores determinan que se haga uno o lo otro?

Fig3 BAJO NIVEL SALINA ALTO NIVEL SALINA SALINA NIVEL INTERMEDIO elongation always precedes contraction

Fig4 no info on water level

Fig5 crawling after mechanical stimulation Swimming after mechanical stimulation

Fig6 Lo que para al animal, hiperpolariza a R3b1

Fig7 1- moverse 2- cómo moverse!