Image: orientation tuning curve. center-surround organization like simple cells, respond best to bars of a particular orientation. However, unlike simple cells,

The variability in estimation of preferred orientation is dependent upon both biological and methodological sources. This study covers methodology variability. Three different procedures for calculating the central tendency of tuning curves were evaluated on the same data sets. a graph of neuronal reaction as an operation of a ongoing stimulant attribute, like wavelength,, orientation, or frequency.A neuron is thought to be "tuned" for the stimulant which induces the largest reaction, and the width of the curve from the half-maximum reaction on either side of the peak indicates how widely or narrowly tuned a neuron is for a particular stimulant attribute. This study covers methodology variability. Three different procedures for calculating the central tendency of tuning curves were evaluated on the same data sets. (Each data set consisted of a collection of points derived from a mathematically defined orientation function for a model cell with, in many cases, an added perturbation.

Orientation tuning curve

A little less than distribution or the bell curve is one of the most commonly occurring. av M Hjohlman · Citerat av 18 — 3.3.1. Results and analysis. 35. 4.

the orientation tuning curves of neurons in V1 of anesthetized cats were measured by presenting high-contrast square-wave drifting grat-ings at 16 orientations (equally spaced at 22.5 deg), and recording the spike trains. The gratings had a spatial frequency of 0.5 cycle/deg, and

16 okt. 2018 — curve LED display to 1560 x 880 pixels, with the North and precise tuning options available in GALAXY to deal with dolly with a gyro-stabilised camera-head allow for the control of camera orientation and lens parameters. av GB Wärvik · 2016 — FUTURE ORIENTATIONS OF IMMIGRANT YOUTH IN A SEGREGATED. SWEDEN appearing as constantly progressive fine tuning of student diagnostics.

The orientation tuning bandwidth of each tuning curve was measured in degrees as the half‐width at half‐height (HWHH), which equals 1.18 × σ based on the equation above. Note, that our orientation tuning curves typically had two peaks, one for each direction over 360 deg (see Fig. 2A–L).

More particularly, the slope of the orientation tuning curve that was measured at the trained orientation increased only for the subgroup of trained neurons most likely to code the orientation tuning curve shape are stable in the majority of neurons; however, more than forty percent of cells show a signiﬁcant change in either preferred orientation or tuning width between early and late portions of the response. C, Orientation tuning curves of the F0 (black) and F1 (red) component of the spike response. D, Orientation tuning curves of the F0 (black) and F1 (red) component of the membrane potential when the spikes are suppressed. The mean voltage is measured relative to the average potential of the neuron without stimulus. Then, based on linear spatial summation of the RF profile, we obtain a predicted orientation-tuning curve, which represents the linear contribution. The nonlinear contribution is estimated as the difference between the predicted tuning curve and that measured with drifting sinusoidal gratings. Tuning curve values and binary detection gradient values for oriented grating stimul Topics: vision, feature-based attention, convolutional neural network, spatial attention 2) orientation tuning curve 3) Complex cells 3) End-stopped cells *Their findings that neurons respond selectively to stationary and moving lines were extremely important because they were an important step toward determining how neurons respond to more complex objects.

cell’s orientation tuning curve is invariant to changes in stim-ulus contrast (Sclar and Freeman 1982; Skottun et al. 1987): a change in contrast scales all responses by a constant, rather than changing the form of the response tuning curve. However, other aspects of simple cell responses show a Intracellular measurement of orientation tuning of the membrane potential of a simple cell in cat Vl in warm and cooled conditions. The shapes of the two tuning curves are similar, although their amplitudes are different. (Note the different right and left vertical scales.) Redrawn from [9”].
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[1] Orientation Tuning Curve The data associated with one specific feature detector from PSYCO 367 at University of Alberta 2007-10-15 · To model the orientation tuning of each cell, we assumed that the neuron's response at each moment in time following the presentation of a particular stimulus orientation can be characterized by a circular Gaussian (CG) tuning curve, where the parameters of this Gaussian curve change as a function of the time lag after stimulus presentation.

av M Hjohlman · Citerat av 18 — 3.3.1.
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Orientation Plasticity in Adult Visual Cortex 289 Figure 2. Adaptation-Induced Response Suppression and Facilitation (A and B) Tuning curves of cells that show adaptation-induced response suppression on the near flank and response facilitation on the far

End-stopped cells: a cortical neuron that responds best to lines of a specific length that are moving in a particular direction. Orientation Tuning Curves and Gradients . By Grace W. Lindsay and Kenneth D. Miller. Cite .