L6-Neural Connections

L6-Neural Connections - Sensory Processes Perception PSY...

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    Sensory Processes & Perception PSY 343 Spring Session 2007 - Lecture 6 Neural Connections Instructor:  Sean Green
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    Vision - Neural Connections  Review So far we’ve learned: That neurons are connected to one another by  synapses That when one neuron fires it can excite or  inhibit other neurons connected to it That this allows neurons to carry information  about the outside world
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    Vision - Neural Connections  Question for today How do we describe neural connections in  a way that helps us understand what they  do? One answer – Neural circuits Neural circuits are groups of neurons  connected by synapses
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    Vision - Neural Connections  Representing Neural Connections When modeling visual perception, scientists can  represent neural circuits as lines connecting dots,  like this The dots (called  Nodes ) don’t have to be single  neurons. Each one could represent the average  activity of many neurons Excitatory Connection Inhibitory Connection
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    Vision - Neural Connections  Representing Neural Connections Then, we can indicate the activity of a node  by giving it a number A very active node will have a larger impact  on the activity of the receiving node Excitatory Connection Inhibitory Connection 100 +10 110 -10  90 100
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    Vision - Neural Connections  Example 1: A simple circuit Here’s a simple circuit Receptor Stimulus With this circuit, you can tell when light hits the  receptor, because the neuron will be more active
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    Vision - Neural Connections  Example 2: Another simple circuit You can also use an inhibitory connection Receptor Stimulus In this case, you could tell that a stimulus was present  because the neuron was less active
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    Vision - Neural Connections  Example 3:  A slightly more complicated circuit Let’s suppose you want to tell whether a  stimulus is coming from the left or the right Receptor Receptor If we set up our circuit like this: Then the neuron in the middle will fire faster when the  stimulus comes from your left and slower when it comes  from your right
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    Vision - Neural Connections  Receptive Fields We have lots of receptors A single neuron or group of neurons will only be  connected to some of them The location of the receptors that influence the  firing of a particular neuron is called its  receptive  field Receptors Receptive field
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