What factors influence the size of the receptive field?
What factors influence the size of the receptive field?
The receptive field size of neurons in primary visual cortex depends strongly on the stimulus contrast. The size can be more than two times larger when measured with low contrast stimuli than when measured with high contrast stimuli.
What is receptive field size?
“…the receptive field size for the layer. This is the size (in pixels) of the local image region that affects a particular element in a feature map.” which makes sense with the traditional definition of a receptive field. Its usually thought as the number of pixels that affect a particular node in the feature map.
What is the size of V1 neurons receptive fields?
In macaque area V1, receptive field sizes (in terms of width, or square root of area) are approximately linearly related to eccentricity up to at least 20° (Hubel and Wiesel, 1974). Average field size increases from ~0.25° in the fovea to ~1.3° at 20°.
How the size of receptive fields influences somatosensory information?
In the somatosensory system, receptive fields are regions of the skin or of internal organs. Some types of mechanoreceptors have large receptive fields, while others have smaller ones. Large receptive fields allow the cell to detect changes over a wider area, but lead to a less precise perception.
What is a receptive field what cells have them?
The receptive field encompasses the sensory receptors that feed into sensory neurons and thus includes specific receptors on a neuron as well as collectives of receptors that are capable of activating a neuron via synaptic connections.
Where are the receptive fields for V1 neurons?
Each V1 neuron has two receptive fields, one per each eye. These receptive fields cover the same region of visual space, but differ slightly so as to endow each neuron with a preferred distance, as determined by stereopsis (Cumming and DeAngelis, 2001).
How do you calculate receptive fields?
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.
How do you calculate receptive field size?
The third equation calculates the receptive field size of the output feature map, which is equal to the area that covered by k input features (k-1)*j_in plus the extra area that covered by the receptive field of the input feature that on the border.
Is V1 Retinotopic?
Area V1 has retinotopic organization, meaning that it contains a complete [map of the visual field | visual map] covered by the two eyes. For instance, 50% of the area of human V1 is devoted to the central 2% of the visual field (Wandell, 1995).
What is called as the two-point discrimination threshold?
In clinical settings, two-point discrimination is a widely used technique for assessing tactile perception. The smallest distance between two points that still results in the perception of two distinct stimuli is recorded as the patient’s two-point threshold.
What happens if a light source falls outside the receptive field?
If a light stimulus applied to the centre of a bipolar cells’s receptive field has an excitatory effect on that cell, causing it to become depolarized, it is an ON-centre cell. A ray of light that falls only on the surround, however, will have the opposite effect on such a cell, inhibiting (hyperpolarizing) it.
