Grating Orientation Test
Grating Orientation Test - Related Videos
06:00
Assessment of Spatial Lingual Tactile Sensitivity using a Gratings Orientation Test
0 Views •
Cited by 2 •
2021
This work illustrates a standard procedure and threshold determination by the R-index to assess spatial lingual tactile sensitivity using a gratings orientation test.
08:48
Writing Bragg Gratings in Multicore Fibers
0 Views •
Cited by 3 •
2016
We describe a technique for inscribing identical fiber Bragg gratings into each core of a multicore fiber. This is achieved by introducing an additional surface into the optical path to mitigate lensing by the curved surface of the fiber cladding.
10:39
Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
0 Views •
Cited by 10 •
2016
The measurement protocol and data analysis procedure are given for obtaining transverse coherence of a synchrotron radiation X-ray source along four directions simultaneously using a single 2-D checkerboard phase grating. This simple technique can be applied for complete transverse coherence characterization of X-ray sources and X-ray optics.
01:30
Oriented Surfaces
0 Views •
2026
A surface is called orientable if a consistent choice of unit normal vector can be made at every point on the surface. A thin soap film stretched across a wire loop provides a familiar example. The film separates the air on one side from the air on the other, so one side can be selected as positive and the opposite side as negative. Once this choice is made, a unit normal vector can be assigned smoothly across the entire surface.At each point on the soap film, a unit normal vector points...
12:08
Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
0 Views •
2015
The fabrication of high contrast gratings as the parallel spectrum splitting dispersive element in a concentrated photovoltaic system is demonstrated. Fabrication processes including nanoimprint lithography, TiO2 sputtering and reactive ion etching are described. Reflectance measurement results are used to characterize the optical performance.
FAQs
Orientation selectivity emerges when responses vary systematically as the angle of the grating changes. By comparing responses across several stimulus orientations, investigators can identify whether a visual neuron, circuit, or observer responds more strongly or accurately to particular angles. This pattern provides evidence that the system represents orientation selectively rather than responding identically to every patterned stimulus.
An orientation preference identifies the angle that produces the strongest response or most consistent behavioral performance. A discrimination threshold instead describes how precisely the observer or subject can distinguish between orientations. These measures answer different questions: preference characterizes the favored stimulus angle, whereas threshold describes sensitivity to differences between angles. Together, they provide a more complete tuning profile.
Tuning profiles summarize how responses change across stimulus orientations and therefore help researchers examine neural coding, the representation of visual information by neural activity. In biology, these profiles can reveal orientation-sensitive pathways and support comparisons between responses recorded from the retina and visual cortex. Their main value lies in linking stimulus angle with the organization of visual processing.
Behavioral testing compares an observer’s or experimental subject’s responses to gratings presented at different angles, whereas physiological testing examines responses recorded from visual structures such as the retina or visual cortex. The two approaches measure different levels of the same processing system. Comparing their results can relate perceptual discrimination or preference to orientation-sensitive neural activity.
A typical procedure presents patterned gratings, such as alternating light and dark bars, at multiple orientations. The observer or experimental subject then provides responses, or investigators record physiological activity when the protocol uses neural measurements. Researchers compare the collected responses across angles and organize the results into orientation preferences, discrimination thresholds, or tuning profiles, depending on the measurement.
The test can produce evidence about which orientations a visual system favors and how well it distinguishes among them. When applied to neural recordings, the resulting profiles help characterize orientation selectivity in the retina or visual cortex. These outcomes support investigations of visual processing, neural coding, and the organization of pathways that respond selectively to patterned stimuli.