Sensory system - Introduction
11 important questions on Sensory system - Introduction
How is the receptive field shaped?
Divergence
--> happen at the same time
What is convergence (receptive field)?
What is divergence (receptive field)?
--> exception are the nude nerve endings
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What does the ratio between receptors and 1st relay neurons indicate?
Low ratio = precise system
Does lateral inhibition from receptor to neuron only happen in the visual system?
How is lateral inhibition incorporated in other systems than the visual system?
What characterizes a receptor?
- size of receptive field
- speed of adaptation
- tonic - APs generated as long as the stimulus is present
- phasic - APs generated also after stimulus is gone
What are examples of tonic receptors?
There are three types of cortical neurons, which three?
2. Direction sensitive = much more responsive to motion in one direction than in another
3. Orientation sensitive = respond best to motion along specific axis (complex cell)
What is the labelled line principle?
What does a receptor sense?
- qualitative information = what do we sense, the labelled line principle
- quantitative information = how intense is the sensation. Different receptors have different thresholds (again depends on the labelled line principle). Per receptor: duration of the stimulus determines length of pulse train and strength of stimulus determines frequency of pulse train.
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