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How do frogs perceive stationary objects?

How do frogs perceive stationary objects?. Laura Skorina. Why “stationary objects”? Visually mediated frog behaviors: Looming -> Avoid Prey -> Approach “Navigation” -> Know where (and where not) to move to… . Ant. thalamus. Anterior thalamus stationary objects?. Optic tectum threats

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How do frogs perceive stationary objects?

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  1. How do frogs perceive stationary objects? Laura Skorina

  2. Why “stationary objects”? • Visually mediated frog behaviors: • Looming -> Avoid • Prey -> Approach • “Navigation” -> Know where (and where not) to move to…

  3. Ant. thalamus • Anterior thalamus • stationary objects? • Optic tectum • threats • prey The frog brain: But if you take out the tectum… Modular organization of visual processing…

  4. Three-pronged approach: • Behavioral • Disconnection studies - take out part of brain • Physiological • Record electrical activity of neurons • Anatomical • Map out neural connections with tracers

  5. Behavior: • Disconnect region of dorsal anterior thalamus • Frog responds to prey and looming stimuli • Frog bumps into barriers

  6. Site of electrode penetration • Physiology: • Record from neurons in dorsal anterior thalamus • …while presenting stimuli relevant to “stationary object” perception ON OFF

  7. Application site • Anatomy: tracing connections • Horseradish peroxidase – retrograde/anterograde axonal transport • So far, HRP has revealed projections to: • “Lateral Forebrain Bundle”…? • Contralateral DAT • Bilateral pretectum

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