Podcast
Questions and Answers
Why can't we process everything in high resolution?
Why can't we process everything in high resolution?
- This would cause the blind spot to take up most of the retina (correct)
- We do not have the sufficient amount of photoreceptors to process that much information
- This would cause the volume of the visual cortex to increase
- The visual cortex can only process information of a certain resolution
Why do we see grey dots when we look at an intersection of the Hermann Grid?
Why do we see grey dots when we look at an intersection of the Hermann Grid?
- Off centre of receptive field located at that intersection has more light in its inhibitory surround than any other receptive field. This is lead to lateral inhibition.
- On centre of receptive field located at that intersection has more light in its inhibitory surround than any other receptive field. This is lead to lateral inhibition. (correct)
- Off centre of the receptive field located at that intersection has less light in its inhibitory surround than any other receptive field.
- On centre of the receptive field located at that intersection has less light in its inhibitory surround than any other receptive field.
Which one of these features about the retinal ganglion cells is incorrect?
Which one of these features about the retinal ganglion cells is incorrect?
- Retinal ganglion cells respond to light falling outside the receptive field (correct)
- Retinal ganglion cells respond to changes in the luminous profile within the receptive field.
- Retinal ganglion cells do not respond to changes in the overall luminance of the visual field.
- Retinal ganglion cells do not respond to light falling outside the receptive field
Cells do not respond to stimulus bigger than it's receptive field. Instead a change in light within the receptive field causes a response.
Cells do not respond to stimulus bigger than it's receptive field. Instead a change in light within the receptive field causes a response.
What is the role of the cornea?
What is the role of the cornea?
What is the vitrenous humour?
What is the vitrenous humour?
How can a person with emmetropia see close objects?
How can a person with emmetropia see close objects?
Which feature of rods is incorrect?
Which feature of rods is incorrect?
The blind spot is area of the retina where there are no photoreceptors. It is 12 - 15 degrees into the nasal retina where the ganglion cells axon and blood vessels leave the eye.
The blind spot is area of the retina where there are no photoreceptors. It is 12 - 15 degrees into the nasal retina where the ganglion cells axon and blood vessels leave the eye.
Which feature is correct about the retinal ganglion cells?
Which feature is correct about the retinal ganglion cells?
Study Notes
Visual Perception
- We can't process everything in high resolution because of limitations in the visual system.
Hermann Grid
- Grey dots appear at the intersection of the Hermann Grid due to an optical illusion.
Retinal Ganglion Cells
- A correct feature of retinal ganglion cells is that they respond to changes in light within their receptive field, not to stimuli larger than it.
- An incorrect feature of retinal ganglion cells is that they respond to stimuli bigger than their receptive field.
Eye Anatomy
- The cornea's role is to focus light onto the retina.
- The vitreous humour is a clear gel-like substance that fills the space between the lens and the retina.
Visual Acuity
- A person with emmetropia (normal vision) can see close objects by increasing the curvature of the lens and reducing the focal length.
Rods
- An incorrect feature of rods is that they have some other characteristic (not specified).
Blind Spot
- The blind spot is an area of the retina, 12-15 degrees into the nasal retina, where there are no photoreceptors and the ganglion cells' axons and blood vessels leave the eye.
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