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Related Concept Videos

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...
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.
Design Example: Alignment of a Road Line Using GIS01:17

Design Example: Alignment of a Road Line Using GIS

The alignment of a road line using Geographic Information Systems (GIS) is a critical process in civil engineering, combining advanced technology with practical decision-making. This methodology begins with the collection of geospatial data, including information on land cover, geomorphology, drainage patterns, slope, and contour details. Such data is typically acquired through satellite imagery and GIS tools, offering a comprehensive understanding of the terrain.Once the data is gathered, it...
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"...
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.
Direct Motor Pathways01:11

Direct Motor Pathways

The direct motor pathways, also known as the pyramidal tracts, are a group of neural pathways that originate in the brain and descend through the spinal cord. They control the voluntary movement of the body. There are two major direct motor pathways: the corticospinal and the corticobulbar tracts.
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Assessing Human Spatial Navigation in a Virtual Space and its Sensitivity to Exercise
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Assessing Human Spatial Navigation in a Virtual Space and its Sensitivity to Exercise

Published on: January 26, 2024

Mapping the route to visual awareness.

Hinze Hogendoorn1, Thomas A Carlson, Frans A J Verstraten

  • 1Experimental Psychology Division, Helmholtz Institute, Utrecht University, Utrecht, The Netherlands. j.h.a.hogendoorn@uu.nl

Journal of Vision
|November 5, 2011
PubMed
Summary
This summary is machine-generated.

Researchers identified neural correlates of awareness by linking selection speed to brain activity latency. This approach helps pinpoint brain regions involved in visual information processing and awareness.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psychology

Background:

  • Identifying the neural basis of perceptual awareness is a significant challenge in neuroscience.
  • Existing methods often struggle to isolate the precise neural events underlying conscious experience.

Purpose of the Study:

  • To introduce a novel method for identifying neural correlates of perceptual awareness.
  • To leverage the temporal relationship between attentional selection and awareness development.

Main Methods:

  • Recorded event-related potentials (ERPs) during a visual task.
  • Designed a behavioral task to precisely measure attentional selection latency.
  • Analyzed trial-by-trial variability in both behavioral selection latency and ERP latency.

Main Results:

  • Found a significant correlation between behavioral variability in attentional selection latency and ERP latency.
  • This correlation was observed in posterior contralateral, central, and frontal brain regions.
  • Demonstrated that neural process latency can isolate neural correlates of awareness.

Conclusions:

  • The temporal dynamics of neural processes are crucial for understanding awareness.
  • Specific brain regions, including posterior, central, and frontal areas, act as key waypoints for visual information leading to awareness.
  • This latency-based approach offers a powerful tool for future research into the neural basis of consciousness.