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6. The preferred value/firing rate of V4 neurons...
- Varies systematically with the shape and orientation of simple silhouettes
- Varies systematically with the shape and orientation of global form
- Varies systematically with the shape and orientation of complex objects
- Varies systematically with the shape and orientation of object affordances
7. Which is more likely to exist in the brain?
- Sparse/dense population codes
- Grandmother cells
8. What is coarse coding?
- The same neuron can be used to detect the presence of a stimuli based on its similarity to a prototypical representation
- Each neuron represents a range of possible input values
- Information about the stimulus is carried in the precise timing of individual spikes
- Information about the stimulus is carried in the rate of firing
9. In the retinal code for colour, how many types of photoreceptor cones are there?
10. Population codes...?
- Create U shaped tuning curves
- Resolve ambiguity present in the firing of individual neurons
- Create conflict between individual neurons
- Create L shaped tuning curves
11. What is a spectral colour?
- Colours that correspond to a single wavelength
- Mixtures of colours that produce the same activity as a spectral colour
- A firing rate weighted average of each neurons preferred value
12. What is a metamer?
- Mixtures that produce the same activity as a spectral colour
- Colours that correspond to a single wavelength
13. How can you calculate a weighted average of directional measures as in Georgopoulous et al?
- Vector sum of prefered directions weighted by firing rate. Population vector predicts actual movement
- Firing rate x vector sum of preferred directions weighted by amplitude
- Firing rate x vector sum of preferred directions weighted by firing rate
- Vector sum of prefered directions weighted by firing rate. Population vector does not predict actual movement
14. What was the task in a study by Georgopoulous et al?
- The monkey moves the lever from the centre to a direction along 360 degree of points.
- The monkey moves the lever from the monkeys position to a direction along 180 degree of points.
- The monkey moves the lever from the centre to a direction along 180 degree of points.
- The monkey moves the lever from the the monkeys position to a direction along 360 degree of points.
15. What is breadth of tuning in relation to sparsity?
- The proportion of stimuli to which a given neuron responds
- How many neurons are found in a space which codes for a particular stimulus (influences gross firing rate)
- The proportion of neurons that fire in a given time window
- A subset of the grandmother cell hypothesis
16. What is the name for a pattern that cant be distinguished aka a indistinguishable percept?
- Metamers, mixtures that produce the same activity. Cant be distinguished from spectral colours
- Spectral colours, mixtures that produce the same activity. Cant be distinguished from metamers.
17. What was found in a study by Georgopoulous et al?
- Activity increases when lever is about to be moved in the preferred direction
- Activity decreases whilstr the lever is moved in the preferred direction
- Activity increases after the lever is moved in the preferred direction
- Activity decreases when lever is about to be moved in the preferred direction
18. What can be used to decode the value signalled from coarse coding?
- A firing rate weighted average of each neurons preferred value
- A temporally weighted average of each neurons preferred value
- A histologically weighted average of each neurons preferred value
- An amplitude weighted average of each neurons preferred value
19. Which is the correct way to work out a firing rate weighted average?
- (Sum of) Firing rate x preferred firing/total amount of firing
- (Sum of) Firing rate x preferred firing/preferred firing of the cell
- Preferred firing + firing rate x cell output
- (Sum of) Preferred firing + firing rate x cell output/number of cells
20. How can the ambiguity in single neuron bell curves be resolved?
- Adding another neuron, different patterns seen at each stimulus value
- Considering the population vectors and neurons in surrounding areas, different patterns seen at each stimulus value
- Increasing the amount of presented stimulus
- Decreasing the amount of presented stimulus