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Related Concept Videos

Vision01:24

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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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The Retina01:32

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The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.
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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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The specificity of orientation-tuned normalization within human early visual cortex.

Michaela Klímová1,2, Ilona M Bloem1,2,3, Sam Ling1,2

  • 1Department of Psychological and Brain Sciences, Boston University, Boston, Massachusetts.

Journal of Neurophysiology
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Summary

Visual cortex normalization shows feature tuning. Suppression strength decreases as stimulus orientation similarity changes, with a bandwidth of 20-30 degrees in human visual cortex.

Keywords:
divisive normalizationfMRIvisionvisual cortex

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Computational Vision

Background:

  • Normalization in the visual cortex is influenced by contextual factors, where similar features cause greater suppression than dissimilar ones.
  • The orientation content of stimuli significantly impacts this feature-tuned suppression, with collinear orientations causing more attenuation than orthogonal ones.
  • The precise bandwidth of orientation-tuned normalization in humans remains understudied.

Purpose of the Study:

  • To investigate the bandwidth of orientation-tuned suppression in the human visual cortex using functional magnetic resonance imaging (fMRI).
  • To parametrically assess how changes in orientation similarity affect neural responses and suppression strength.
  • To provide empirical constraints for computational models of visual normalization.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed to measure blood-oxygen-level-dependent (BOLD) responses in human participants.
  • Participants viewed a full-field circular stimulus with wedges of orientation-bandpass filtered noise, allowing gradual variation of orientation differences.
  • Voxel-wise analyses quantified the bandwidth of orientation-tuned suppression across different visual areas and eccentricities.

Main Results:

  • The greatest suppression occurred for collinearly oriented stimuli, with BOLD responses gradually increasing as orientation differences became larger.
  • The estimated voxel-wise bandwidth of orientation-tuned normalization ranged between 20° and 30° and was consistent across early visual areas.
  • Suppression bandwidth covaried with retinotopic preference, showing the narrowest tuning at outer eccentricities.

Conclusions:

  • Orientation-tuned normalization in the human visual cortex exhibits a specific bandwidth, constraining the influence of feature similarity on neural suppression.
  • The findings characterize the feature-tuning properties of normalization in early visual cortex, offering valuable data for theoretical models.
  • Understanding this bandwidth is crucial for refining models of divisive normalization and its role in visual processing.