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Related Concept Videos

Vision01:24

Vision

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.
Light Acquisition02:16

Light Acquisition

In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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 layer, the vascular tunic,...
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
Perceptual Constancy01:12

Perceptual Constancy

Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
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Related Experiment Video

Updated: Jun 7, 2026

Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice
07:33

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Precise spatial tuning of visually driven alpha oscillations in human visual cortex.

Kenichi Yuasa1,2, Iris I A Groen1,3, Giovanni Piantoni4

  • 1Department of Psychology, New York University, New York, United States.

Elife
|June 13, 2025
PubMed
Summary
This summary is machine-generated.

Alpha oscillations in the brain decrease with visual stimulation, contrary to some findings. This study reveals alpha power reduction and broadband power increase, crucial for understanding visual attention.

Keywords:
ECoGalpha oscillationscomputational modelsexogenous attentionhumanneurosciencepRFspopulation receptive fieldsvisual cortex

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Area of Science:

  • Neuroscience
  • Visual Neuroscience
  • Human Electrophysiology

Background:

  • Alpha oscillations (approx. 10 Hz) are linked to occipital cortex inactivity.
  • Recent studies show conflicting results regarding alpha power during visual stimulation.

Purpose of the Study:

  • Investigate the relationship between alpha oscillations and visual stimuli using intracranial recordings.
  • Hypothesize that increased local alpha power reflects a mix of reduced alpha and increased broadband power.

Main Methods:

  • Used intracranial electrodes in human patients to record neural activity.
  • Measured alpha oscillations and broadband power in response to visual stimuli.
  • Developed a model to separate oscillatory and broadband power components.
  • Applied population receptive field (pRF) models to both components.

Main Results:

  • Alpha pRFs were larger than broadband pRFs but showed decreased alpha power within the receptive field.
  • Broadband power increased with visual stimulation within the receptive field.
  • Alpha suppression is precisely tuned and requires separating oscillatory from broadband signals.

Conclusions:

  • Alpha oscillations are associated with cortical inactivity, evidenced by decreased power during stimulation.
  • Separating alpha oscillatory power from broadband power is essential for accurate analysis.
  • Large, negatively valenced alpha pRFs help explain exogenous visual attention mechanisms.