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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.
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,...
Association Areas of the Cortex01:21

Association Areas of the Cortex

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:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
Visual System01:26

Visual System

Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.
Visual Agnosia01:12

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...

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Related Experiment Video

Updated: May 17, 2026

Where You Cut Matters: A Dissection and Analysis Guide for the Spatial Orientation of the Mouse Retina from Ocular Landmarks
08:42

Where You Cut Matters: A Dissection and Analysis Guide for the Spatial Orientation of the Mouse Retina from Ocular Landmarks

Published on: August 4, 2018

A cardinal orientation bias in scene-selective visual cortex.

Shahin Nasr1, Roger B H Tootell

  • 1Athinioula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts 02129, USA. shahin@nmr.mgh.harvard.edu

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|October 27, 2012
PubMed
Summary
This summary is machine-generated.

Human vision shows an "oblique effect," favoring cardinal orientations. This study links this effect to scene perception, finding the parahippocampal place area (PPA) shows bias for cardinal orientations in real-world scenes and simple images.

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08:42

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Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
06:46

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Published on: March 18, 2019

Area of Science:

  • Visual neuroscience
  • Perception psychology
  • Neuroimaging

Background:

  • Human vision exhibits an
  • oblique effect,
  • demonstrating greater sensitivity to horizontal and vertical contours over oblique ones.
  • The ecological relevance of this perceptual bias remains unclear.
  • Image statistics in natural and man-made environments often favor cardinal orientations.

Purpose of the Study:

  • To investigate the real-world relevance of the oblique effect.
  • To determine if the parahippocampal place area (PPA), a scene-selective visual region, exhibits orientation biases.
  • To explore the link between scene statistics and the oblique effect in visual processing.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity in response to visual stimuli.
  • Participants viewed natural scenes, computer-generated square arrays, and line segment patterns.
  • Activity in scene-selective areas, including the PPA, was analyzed for orientation preferences.

Main Results:

  • A perceptual oblique effect was confirmed using scene stimuli.
  • The PPA showed significantly higher fMRI activity for cardinal orientations compared to oblique orientations in scenes.
  • This cardinal orientation preference in PPA extended to simple geometric stimuli, independent of scene context.

Conclusions:

  • The oblique effect is linked to scene perception, driven by statistical biases in visual input.
  • The PPA demonstrates a consistent selectivity for cardinal orientations across diverse visual stimuli.
  • This PPA selectivity may underlie the perceptual oblique effect observed in human vision.