How is the action potential propogated through the cell?
Axon
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What characterises the 'detector' analogy?
An individual neuron intergrates information from a variety of sources and sends a signal representing the degree to which the inputs match some type of pattern
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How big is the tip of the electrode used in extracellular single unit recording?
40 micrometers which detect 4/5/6 surrounding neurons
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Does amplitude of an action potential carry information?
No, each action potential has approximately the same amplitude
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Does firing rate/ timing of action potentials carry information?
Yes, each actions potentials rate and timing reflects the neurons activity
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In a raster plot, what does a dot represent?
A spike
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In a raster plot, what does a row represent?
An experimental trial
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In a raster plot, what does the peristimulus histogram represent?
How many spikes fired in a given period
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What is rate coding?
Information about the stimulus or response is carried in the rate at which the cell fires
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What is temporal coding?
Information about the stimulus or response is carried in the precise timing of the individual spikes
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What does a tuning curve represent?
The typical graded response patterns of neurons
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What shape is a typical tuning curve?
Bell shaped
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What are 2 issues with the detector analogy?
Is a unique neuron required for every perceivable percept/concept/action and there is ambiguity in the firing rate in individual neurons
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What was the main issue with grandmother cell single cell studies?
A given neuron will fire to 0.54% of possible stimuli
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Is there ambiguity in bell shaped tuning curves?
Yes, the same firing rate can reflect different properties of the stimulus
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What tuning can generalise e.g the same neuron can detect a stimulus based on similarity to a prototypical representation?
Broad tuning
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Other cards in this set
Card 2
Front
How is the action potential propogated through the cell?
Back
Axon
Card 3
Front
What characterises the 'detector' analogy?
Back
Card 4
Front
How big is the tip of the electrode used in extracellular single unit recording?
Back
Card 5
Front
Does amplitude of an action potential carry information?
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