TB3 Lecture 1; Key facts about sensory processing quiz!

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  • Created by: mint75
  • Created on: 26-05-15 16:47
What is reductionism?
The ability to explain behaviour at the most fundamental level, eg one amino acid difference
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Why is structure important?
Tiny features that make up the brain such as layers, columns, nuclei and maps are important as they can help us understand how the brain works
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What is meant by transduction?
Converting a physical property into neural code
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What is the most common mode of action in a transduction process?
To change ion concentrations via selective ion channels and change membrane potentials
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How are receptors distributed?
Non-uniformly. For example, there is a high density cones approx 5 degrees from fovea (good vision), but inside there are 0 (blind spot)
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What makes neurons responsible for transduction suitable for the changing environmental conditions in which we live?
They have a sliding range that they operate over, so in vision, you can see from one to a million photons
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What happens after transduction?
Receptor signals are combined to capture different properties of the physical stimulus. They transform from graded to action potentials
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Where do signals in the sensory organ project to?
In most senses, the peripheral neurons project to subcortical structures, frequently found in the thalamus. Projection targets are concentrations of cell bodies, nuclei.
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From the nuclei, where next?
The cortex, first the primary sensory cortex and then to the appropriate cortex for the representation (e.g visual)
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Where are visual areas generally found?
Medial
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Where are somatosensory areas mainly found?
Lateral
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What is a 'map'?
A representation of the peripheral sensory tissue on the cortical surface
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What is cortical magnification?
The representation on the cortex is not directly proportionate. Areas used more are given more cortical surface e.g hand more than knee
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Functional distinctions in layers correspond to...?
Anatomical differences
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What is a receptive field?
The area of sensory tissue over which response of a cell can be influenced by a stimulus
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Card 2

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Why is structure important?

Back

Tiny features that make up the brain such as layers, columns, nuclei and maps are important as they can help us understand how the brain works

Card 3

Front

What is meant by transduction?

Back

Preview of the front of card 3

Card 4

Front

What is the most common mode of action in a transduction process?

Back

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Card 5

Front

How are receptors distributed?

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