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Sensory Modalities - Coggle Diagram
Sensory Modalities
Neural Pathways
visual field --> eyes --> optic nerve, chiasm then tract --> LGN in the thalamus --> primary visual cortex
the primary visual cortex contains detectors from a convergence of ganglion cells, and 3 types of other cells like
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Vision
- One of the most important sensory modalities in humans
- Enables remote sensing and has evolutionary advantages as we can detect sth before being in direct contact with it
- The visual stimulus is light which activates the visual system
The eye
- the visual sense organ that collects, amplifies and filters visual stimuli
- also contains photoreceptors that aid transduction
- Transduction = light --> electrical signaling
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Receptive Field
- aspect of the external world that produces a change in firing rate of a given sensory cell
- arises due to convergence which increases deeper into the visual system
- all visual system neurons after the ganglion cells have a receptive field
Ganglion cells
on centre, off surround = more active when light falls in the centre of the receptive field
off centre, on surround = more active when light falls on the outer periphery
- exhibits centre surround organisation of their receptive fields and contains 2 main kinds
- which allows detection of changes in stimuli between 2 parts of the receptive field (lateral inhibition)
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