Auditory and Visual Perception Flashcards
(26 cards)
What are the three approaches to perception?
Psychological, Neuropsychological, Computational
What regulates the size of the pupil in the eye?
Iris
What is the function of the lens in the eye?
Focuses incoming light on retina
What type of circuits have low convergence in retinal processing?
Cone-fed circuits
What type of circuits have high convergence in retinal processing?
Rod-fed circuits
What is the definition of a receptive field?
The area of the visual field to which they respond
What leads to smaller receptive fields in central vision?
Differing convergence
What does cortical magnification refer to?
Many more cells dedicated to processing central vision than peripheral vision
What is the visual pathway from the retina to the brain?
Retina -> lateral geniculate nuclei (LGN) -> Primary Visual Cortex
What is the primary function of the lateral geniculate nuclei (LGN)?
First stage of processing – responds to changes in light levels
What type of receptive fields do LGN cells have?
Centre-Surround cells
What does the primary visual cortex respond to?
Complicated images – binocular disparity, motion, orientation
What defines limits on perceptual abilities?
Differing densities of cone and rod receptors, differing convergence of receptors onto retinal ganglion cells, presence of ‘blindspot’
What do retinotopic maps preserve?
Adjacency relationships between cells as signals travel through visual pathway
Where does the left visual field project in the brain?
Right hemisphere visual cortex
Where does the right visual field project in the brain?
Left hemisphere visual cortex
Fill in the blank: Adaptation in __________ responses measures the contrast required for detection.
behavioural
Fill in the blank: Adaptation in the __________ measures reduction in neural responses.
brain
What are the two types of receptive fields in V1?
Simple cells, Complex cells
What is the role of the cochlear nucleus in hearing?
Initial processing of auditory information
What are the two types of interaural differences that aid in sound localization?
Interaural time differences, Interaural level differences
What is represented in the primary auditory cortex as a tonotopic map?
Frequencies
What does functional specialization in the brain refer to?
Different brain areas are specialised for different perceptual processes
What does early sensory processing involve?
Breaking input signal into basic components
