Lecture 14 Flashcards
What were the first experiments showing how biological systems analysed directional motion?
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What was measured and what were the variables which were changed?
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What did they find out? What was the model called?
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What were the key properties of the Elementary Movement Detector?
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How is motion analysed in a fly?
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What are the different studies which can be combined?
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What are the different experimental model organisms used to analyse sensory processing in insects? What applications were for each type showing how visual information is processing in biology?
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What is the simplified phenomenological EMD model? Draw it? What are the different components? What is the process?
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What is a results of this?
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How can the mechanism distinguish between motion in one and the opposite direction?
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How is it implemented in the nervous system? Draw it?
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What are the necessary and sufficient conditions for a directional selective mechanism?
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What happens if motion of infinite velocity? What does this therefore mean?
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What is an alternative model? What is it called?
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What are the stages of this gradient detector model?
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What type of output does it give in the velocity domain?
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How does the gradient model work?
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Why would the gradient model not be an actual good model for biological systems?
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Does the gradient model fulfil the necessary and sufficient conditions for a directional selective mechanism?
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How can you work out which model the fly visual system employs?
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What are the important parameters? What do they stand for?
a. What is delta I?
b. What is cf?
What is a? What are the properties?
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What are the steady state responses of the two models? What are the equations?
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How does the gradient detector steady state response look?
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What is a torque meter? What is it used for?
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What did it show? What is it useful for?
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How can it be run in a closed - loop condition? What is this mode useful for?
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How did the 2 models perform is compared the output of the stimulation with experimental data? What were the four variables looked at?
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What was the outcome? Which one was better? Why?
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What is the anatomy of the fly visual system? What are Lobula plates? What are the properties?
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What are LPTCs?
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What are the properties of the LPTCs which make it useful for experimental use? What is the response of the LPTC like?
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What is the general cells and circuits of motion vision?
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What are the comparisons of different species’ motion detection?
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What are the different types of LPTCs in the blowfly? What are their functions?
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What represents the optic flow fields? What is a problem with this?
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How to get over this ambiguity?
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What is a Matched filter for optic flow? How does it work?
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What are the directional selective response sin LPTCs?
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What can you work out using this information?
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What can you plot using this? What are the axis? What does it show?
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What are VS neurons?
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How to work out the flow fields and then using that the rotation axes of particular neurons are?
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What are the other neurons that are more specifically responding to translation?
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What is there reduced sensitivity in the ventral part in VS neurons?
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What does this show?
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Where is the higher sensitivity in translation neurons?
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Does the directional template of LPTC depend on early visual experience in flies? On humans? What was the experiment done to show this?
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What does the experiment say about how this adaptation has developed?
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What is seen when plot the orientation of the eye lattice?
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What is seen when plot the local preferred direction measured in neurons on top of the orientation of the eye lattice? What does this suggest?
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Does the derived local preferred direction which was predicted actually tell you whether the animal continues simultaneous excitation all over the field and is actually stimulating the neuron the best? What is it actually doing?
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Therefore how to actually find out? What was the experiment?
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What was the results of the experiment?
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What is the linear control engineering framework for optic flow based flight control? What is it used to test?
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How does it work? What are the components?
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What is this used to implement into?
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What are the 3 parameters that can be controlled Using this system?
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What does this show in terms of the principles?
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