1. An OFF-center RG cell initially with no light on its receptive field has a plane of light move into part of its "surround" receptive field region. What happens to its firing rate? Optional Answers: 1. produces a modest increase in firing 2. produces no significant change in firing 3. produces a large increase in firing 4. it shuts off 2. A P-type retinal ganglion cell will typically have ___ receptive fields and will generate ___ responses when responding to light on in the center of its receptive field. Optional Answers: 1. small....sustained 2. large....sustained 3. small....transient 4. large....transient 3. When viewing a black/white grid, an ON-center retinal ganglion cell (RGC) that has its receptive field entirely within the retinal patch of a white square will be MORE STRONGLY ACTIVATED than an RGC on a retinal patch that spans the border a white and dar Optional Answers: 1. True 2. False
Added by Christina S.
Close
Step 1
This will lead to the cell firing as it receives inhibition from a small spot of light in the center but enhances its response to the light in its surroundings. Show more…
Show all steps
Your feedback will help us improve your experience
John Nicolle and 101 other Biology educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Higher forebrain visual structures (such as superior colliculus, LGN; V1) receive input from both eyes but only from the contralateral visual field. A patient has damage to the visual system that results in blindness in the periphery of both the left and right visual fields, where might the damage lie? - Left optic nerve - Left optic radiations - Right optic tract - Optic tract Which of the statements about rods is false? - Rods are specialized for high acuity vision - Rods are achromatic (black and white) - Rods are rare in the fovea - Rods are highly sensitive to light - There are about 120 million rods in the retina A lesion in the hand representation area of the primary motor cortex of the left hemisphere would be expected to cause: - Weakness or complete paralysis of the right hand - Weakness or complete paralysis of the left hand - Loss of the ability to perform complex tasks with the left hand - Loss of the ability to perform complex movement sequences with the right hand, without paralysis - None of the above Which of the following statements about the visual system is false? - Both ON- and OFF-center retinal ganglion cells are stimulated by the same spot of light simultaneously - Nasal hemiretina axons project contralaterally, while temporal hemiretina axons project ipsilaterally - The retinal ganglion cells are the only cells that directly respond to light - Receptive fields can overlap - Horizontal cells make lateral connections between photoreceptor cells
Suman K.
Think about the cGMP involved in "visual transduction" in retinal rod cells (light vision) we discussed in class on Wednesday. Then respond to the following simple but critical steps in the overall visual signal transduction process. Fill in the blank: The specific role of a high level of cGMP in rod cells is to keep the ion channels in an open state on the disc membranes that would cause membrane depolarization and increased neurotransmitter release. (3 pts.) Upon activation of the rhodopsin (a GPCR) by a photon of light, the alpha-subunit of the G-protein (transducin) is activated. What are the immediate signal transduction events following activation of this alpha-subunit of the G-protein that leads to light vision sensed by the brain? Briefly explain it, as we discussed in class, by including all the critical steps.
Adi S.
Watch this video (http://openstaxcollege.org/l/ the the pupillary) to leam about the pupillary reflexes. The pupillary light reflex involves sensory input through the optic nerve and motor response through the oculomotor nerve to the ciliary ganglion, which projects to the circular fibers of the iris. As shown in this short animation, pupils will constrict to limit the amount of light falling on the retina under bright lighting conditions. What constitutes the afferent and efferent branches of the competing reflex (dilation)?
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD