Table of Contents
What is broad tuning?
Sensory and motor variables are typically represented by a population of broadly tuned neurons. A coarser representation with broader tuning can often improve coding accuracy, but sometimes the accuracy may also improve with sharper tuning.
What is sensory tuning?
A classical example of sensory neuron tuning is the preferential firing of a subset of neurons in the visual cortex in response to a moving visual stimulus of a particular orientation. A popular model for the underlying mechanism has been the clustering of orientation-specific synaptic inputs on a given dendrite.
What is a tuning function?
The tuning function is the link between the stimulus (here the direction and speed. ) and the activity of the simulated neurons. The value of the tuning function multiplied with the size of the time-window acts as expectation value for the Poisson process.
What is neuronal selectivity?
The neuron prefers horizontal. It is selective for orientation. So at least according to how neurophysiologists have defined selectivity over the past half century, the term refers to how much varying the stimulus along this dimension affects the neuronal response.
What is a neuron tuning curve?
a graph of neuronal response (usually measured in action potentials or spikes per unit time) as a function of a continuous stimulus attribute, such as orientation, wavelength, or frequency.
What is directional tuning?
Neural activities during reaching movements have been recorded from both cortical and subcortical motor areas. A notable finding is that neural spike rates in motor-related areas exhibit broad, cosine-like extrinsic tuning with respect to movement direction, a property known as directional tuning.
What is visual tuning?
Visually Tuned System Accepted neuronal tuning models suggest that neurons respond to different degrees based on the similarity between the optimal stimulus of the neuron and the given stimulus. Neurons in area V4 are selectively tuned to different wavelengths, hues, and saturations of color.
What do tuning curves tell us about VIIIth nerve fibers?
Activity within the inner haircells triggers neural responses in auditory nerve fibers lying in the VIIIth cranial nerve bundle. Each tuning curve displays the sound level required to increase neural firing rate a threshold amount above spontaneous rate as a function of frequency.
Are neurons selective?
Our finding that IT neurons are highly selective along many stimulus dimensions is similar to reports in primary visual cortex (V1) that spatial frequency bandwidth and orientation bandwidth are correlated (De Valois et al. 1982; Stevens 2004; Xing et al. 2004).
How is stimulus selectivity measured?
Classic selectivity describes the stimulus that produces the maximum response for a given stimulus magnitude (Smax). If a neuron is linear, then classic selectivity can be determined by measuring the response to a basis set (e.g., spots or gratings).
What is cell tuning?
Neuronal tuning refers to the hypothesized property of brain cells by which they selectively represent a particular type of sensory, association, motor, or cognitive information. Some neuronal responses have been hypothesized to be optimally tuned to specific patterns through experience.
What is the difference between premotor cortex and primary motor cortex?
The premotor cortex appears to be involved in the selection of appropriate motor plans for voluntary movements, whereas the primary motor cortex is involved in the execution of these voluntary movements. Premotor cortex neurons signal the preparation for movement.
What is neuronal tuning in psychology?
Neuronal tuning. Jump to navigation Jump to search. Neuronal tuning refers to the hypothesized property of brain cells by which they selectively represent a particular type of sensory, association, motor, or cognitive information. Some neuronal responses have been hypothesized to be optimally tuned to specific patterns through experience.
Do neurons tune in the visual system?
(Teller (1984), however, has challenged the “detector” view of neurons on logical grounds) The first major evidence of neuronal tuning in the visual system was provided by Hubel and Wiesel in 1959. They discovered that oriented slits of light were the most effective (of a very small set tested) stimuli for striate cortex “ simple cell ” neurons.
Can single neurons be simultaneously tuned to multiple signals?
Single neurons are hypothesized to be simultaneously tuned to several modalities, such as visual, auditory, and olfactory. Neurons hypothesized to be tuned to different signals are often hypothesized to integrate information from the different sources. In computational models called neural networks,…
What is a visually tuned system?
Visually Tuned System. Accepted neuronal tuning models suggest that neurons respond to different degrees based on the similarity between the optimal stimulus of the neuron and the given stimulus.
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