Abstracts - faqs.org

Abstracts

Zoology and wildlife conservation

Search abstracts:
Abstracts » Zoology and wildlife conservation

Topographical representations of mental images in primary visual cortex

Article Abstract:

Visualizing objects with the eyes closed stimulates the primary visual cortex. Researchers used PET imaging to analyze blood flow in the brains of five male volunteers under different conditions of visualization. The size of the image correlated with the location of maximal activation due to spatial distribution of visual areas. A comparison between two baselines indicates high blood flow during the resting baseline in area 17 of the primary visual cortex. Thus, visual mental imagery entails depictive representation, not just linguistic description.

Author: Alpert, Nathaniel M., Thompson, William L., Kosslyn, Stephen M., Kim, Irene J.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
Images, Optical, Optical images

User Contributions:

Comment about this article or add new information about this topic:

CAPTCHA


Orientation selectivity of thalamic input to simple cells of cat visual cortex

Article Abstract:

Cooling of the visual cortex has negligible influence on the orientation tuning of visually evoked synaptic potentials in cats. Cooling significantly alters the activity in the local cortical circuit below the cooling plate, but leaves the geniculate synaptic input functional. Orientation selectivity originates from cortical inhibitory interaction and selective amplification of geniculate inputs by feedback mechanisms. The lateral geniculate nucleus is involved in 21% to 63% of visually evoked responses.

Author: Ferster, David, Chung, Sooyoung, Wheat, Heidi
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996

User Contributions:

Comment about this article or add new information about this topic:

CAPTCHA


A sense of direction

Article Abstract:

The reason for the unusual morphology of the Meynert cells in the brain has long been considered but a new study suggests that the curiously shaped neurons contribute to the cells' sensitivity to visual motion, particularly direction selectivity. The key to the theory is the cortical retinotopic map, with each point in the cortex receiving input from a reciprocal point in the visual cortex to form an orderly, two-dimensional map of the visual field.

Author: Ferster, David
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
Research, Models, Brain research, Cerebral cortex

User Contributions:

Comment about this article or add new information about this topic:

CAPTCHA


Subjects list: Physiological aspects, Visual cortex
Similar abstracts:
  • Abstracts: Synthetic lethal screen identification of chemosensitizer loci in cancer cells. Failure of B-cell differentiation in mice lacking the transcription factor EBF
  • Abstracts: Gold concentrations of magmatic brines and the metal budget of porphyry copper deposits. Forest-killing diffuse CO2 emission at Mammoth Mountain as a sign of magmatic unrest
  • Abstracts: Photodegradation of methylmercury in lakes. Solid-state organic solar cells
  • Abstracts: Telomerase activation by the E6 gene product of human papillomavirus type 16. Structural basis of calcium-induced E-cadherin rigidification and dimerization
  • Abstracts: Seismicity and stress rotation in a granular model of the brittle crust. Long-period volcano seismicity: its source and use in eruption forecasting
This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.
Some parts © 2023 Advameg, Inc.