What is a center-surround receptive field?
The center-surround receptive field organization allows ganglion cells to transmit information not merely about whether photoreceptor cells are exposed to light, but also about the differences in firing rates of cells in the center and surround. This allows them to transmit information about contrast.
What is a center-surround receptive field quizlet?
Center-surround receptive field. – Center-surround receptive field – receptive field in which the center of the receptive field responds differently to stimulation than the surrounding portion of the field.
Where are receptive fields located?
The classical receptive field
The characteristics of a cell’s receptive field depend on how the field is measured. The classic method to determine the location and extent of the receptive field is to present discrete stimuli at different locations in the sensory periphery, such as on the retina or the skin.
What are receptive fields ganglion cells?
The classical receptive field of a ganglion cell is defined as the area of the retina where stimulation with a small spot of light produces a change in ganglion cell firing rate.
Where is center surround receptive field found?
Most neurons in the retina and thalamus have small receptive fields that have a very basic organization, which resembles two concentric circles. This concentric receptive field structure is usually known as center-surround organization.
What is the purpose of on center and off center ganglion cells?
On-center GCs produce more action potentials when stimulated by a bright light in the center of their receptive field, and are inhibited by stimuli delivered to the surround. Off-center GCs are stimulated by surround stimuli, and inhibited by center stimuli.
Which type of cell would likely have a center-surround receptive field?
Center-surround receptive fields arise from a pool of photoreceptors On-center and off-center fields in retinal bipolar and ganglion cells form by pooling the response of groups of photoreceptors.
What is center-surround antagonism quizlet?
Center-surround antagonism. Type of antagonism shown by ganglion cells due to lateral inhibition in the circuit. Receptive fields. For bipolar & ganglion cells consists of a center circle & a surrounding concentric ring. Antagonistic effects.
What is the receptive field of a neuron quizlet?
The receptive field of a neuron is the part of the sensory world from which an adequate stimulation increases (excitatory) or decreases (inhibitory) a neuron’s activity. For a retinal ganglion cell, its receptive field is the area on the retina where light stimulation changes the cell’s response or firing rate.
What determines whether a ganglion cell is an on Centre or off Centre ganglion cell?
The major functional subdivision of ganglion cells in the mammalian retina is into ON- and OFF-center ganglion cells. ON-center cells are depolarized by illumination of their receptive field center (RFC), while OFF-center cells are depolarized by decreased illumination of their RFC.
Where are the on center cells and off-center cells located?
The surround of the receptive field also influences the amount of glutamate released by the photoreceptors. If the surround is dark the photo sur receptors in this round will depolarize.
What happens when the entire receptive field of an on center cell is covered by a spot of light?
What happens when the entire receptive field of an ON-center cell is covered by a spot of light (i.e. both inner and outer portions of the receptive field)? Cells firing stays the same. What is the effect of having a spot of light touch the outer ring of an OFF-center cell? The cells firing rate increases.
When light strikes the entire receptive field of an on center cell Which of the following happens quizlet?
When light strikes the entire receptive field of an on-center cell, which of the following happens? The cell only slightly increases its firing. The _____ allows the two visual fields to be merged in the brain so that the visual picture is complete.
What are the two types of center surround receptive fields?
There are two primary types of ganglion cell receptive fields:
- ON center/OFF surround cell: Flashing small bright spot in the center subregion increases the cell’s response. …
- An OFF-center/ON-surround ganglion cell has the opposite arrangement.
Which statement best describes the receptive field quizlet?
which statement best describes the receptive field? the ability of each neuron in the skin to detect a stimulus in a given area.
Which order is the correct pathway of vision?
From the cornea, the light passes through the pupil. The iris, or the colored part of your eye, controls the amount of light passing through. From there, it then hits the lens. This is the clear structure inside the eye that focuses light rays onto the retina.
What kind of receptor is used for vision?
Photoreceptors are neurons in the retina of the eye that change visible light from the electromagnetic spectrum into signals that are perceived as images or sight. Rods and cones are two types of photoreceptors located at the back of the eye. Cones allow us to see color.
What is the route that the sensation of taste follows?
There are four types of encapsulated receptors. Select the exception. The route that the sensation of taste follows is: a: Primary axons pass along cranial nerves VII and IX.
What are the steps in the taste pathway?
The fungiform papillae the foliate papillae and the filiform papillae.
What is the pathway between the taste cranial nerves and the cortex?
The cranial nerves carry taste information into the brain to a part of the brain stem called the nucleus of the solitary tract. From the nucleus of the solitary tract, taste information goes to the thalamus and then to the cerebral cortex.
What are the 3 cranial nerves involved in taste?
Taste is mediated by 3 cranial nerves: the facial (VII), glossopharyngeal (IX), and vagus (X), as displayed in the images below. Diagram of the chorda tympani and relations to the petrosal nerves.
Which cranial nerve is most anterior?
The most anterior cranial nerve is the terminal nerve (CN 0), a thin nerve passing along the medial side of the olfactory tract.
Which of the following nerves serves the anterior tongue?
Taste to the anterior two-thirds of the tongue is achieved through innervation from the chorda tympani nerve, a branch of the facial nerve (CN VII). General sensation to the anterior two-thirds of the tongue is by innervation from the lingual nerve, a branch of the mandibular branch of the trigeminal nerve (CN V3).
What is vagus nerve?
The vagus nerve, also known as the vagal nerves, are the main nerves of your parasympathetic nervous system. This system controls specific body functions such as your digestion, heart rate and immune system. These functions are involuntary, meaning you can’t consciously control them.
What is hypoglossal function?
The hypoglossal nerve enables tongue movement. It controls the hyoglossus, intrinsic, genioglossus and styloglossus muscles. These muscles help you speak, swallow and move substances around in your mouth.
What causes vagal stimulation?
The vagal response is a series of unpleasant symptoms that occur when the vagus nerve is stimulated. Often, this response is triggered by certain things like stress, pain, and fear. Symptoms of the vagal response include dizziness, nausea, ringing ears, and sweating.