Cognitive Neuroscience, the biology of the mind, by M. Gazzaniga (fourth edition) – Summary chapter 4

There is lateralization of sensory processing and motor output. The contralateral control of movement for the motor cortex is not absolute. Proximal muscle control is largely bilateral and distal muscle control is largely contralateral. The lateralization of language can be tested by using the WADA-test (temporarily anaesthetize left hemisphere). Lateralization of language can be left, right or bilateral.

The following anatomical differences between the two hemispheres can be observed: a flatter Sylvian fissure on the left (1), difference in size in Heschl’s gyrus (2), difference in size in Planum Temporale (3), larger pyramidal cell bodies in the left Heschl’s gyrus (4) and more distance between patches in Wernicke’s area (5).

Connections between cells are organized in patches. Anatomical differences do not correlate with language lateralization. Macroscopic and microscopic anatomical differences and functional differences exist between the two hemispheres, but are not absolute.

The two hemispheres cooperate because the corpus callosum connects the two hemispheres, together with the anterior commissure and the posterior commissure.  

There is interhemispheric synchrony between neurons that respond to the same stimulus that activates cells with receptive fields in both hemifields.

For split-brain patients, stimuli that are only presented to the right hemisphere cannot be verbally reported if there is a full split of the corpus callosum. When the posterior part of the callosum is sectioned, higher order, abstract information about the stimulus can be reported, but not the stimulus itself. 

Two hemispheres can search for a visual target independently if the corpus callosum is cut. Search time increases with half the slope of regular subjects when items are presented to two hemispheres simultaneously.   

There are differences between the left- and the right hemisphere. The right-hemisphere: is better at spatial and geometrical tasks (1), is better at recognizing faces (2), is better at perceptual organization (3), is better at processing global information (4), has a more prominent fusiform face area (5), uses the maximizing strategy (6). The left-hemisphere: is better at processing details (1), can recognize faces if verbal descriptions can be made (3), is biased towards recognizing the self (4), seeks patterns and sequences in events (5), uses the matching strategy (6).

The difference in spatial and geometrical tasks occurs because of a difference in sensory to motor mapping. Post-hoc rationalization refers to the left hemisphere trying to explain actions performed by the right hemisphere.

Image

Access: 
Public

Image

Join WorldSupporter!
This content is used in:

Summary of Cognitive Neuroscience: the biology of the mind by Gazzaniga - Chapters of 4th edition

Brain & Cognition – Interim exam 2 [UNIVERSITY OF AMSTERDAM]

Search a summary

Image

 

 

Contributions: posts

Help other WorldSupporters with additions, improvements and tips

Add new contribution

CAPTCHA
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.
Image CAPTCHA
Enter the characters shown in the image.

Image

Spotlight: topics

Check the related and most recent topics and summaries:
Institutions, jobs and organizations:
Activities abroad, study fields and working areas:
This content is also used in .....

Image

Check how to use summaries on WorldSupporter.org

Online access to all summaries, study notes en practice exams

How and why use WorldSupporter.org for your summaries and study assistance?

  • For free use of many of the summaries and study aids provided or collected by your fellow students.
  • For free use of many of the lecture and study group notes, exam questions and practice questions.
  • For use of all exclusive summaries and study assistance for those who are member with JoHo WorldSupporter with online access
  • For compiling your own materials and contributions with relevant study help
  • For sharing and finding relevant and interesting summaries, documents, notes, blogs, tips, videos, discussions, activities, recipes, side jobs and more.

Using and finding summaries, notes and practice exams on JoHo WorldSupporter

There are several ways to navigate the large amount of summaries, study notes en practice exams on JoHo WorldSupporter.

  1. Use the summaries home pages for your study or field of study
  2. Use the check and search pages for summaries and study aids by field of study, subject or faculty
  3. Use and follow your (study) organization
    • by using your own student organization as a starting point, and continuing to follow it, easily discover which study materials are relevant to you
    • this option is only available through partner organizations
  4. Check or follow authors or other WorldSupporters
  5. Use the menu above each page to go to the main theme pages for summaries
    • Theme pages can be found for international studies as well as Dutch studies

Do you want to share your summaries with JoHo WorldSupporter and its visitors?

Quicklinks to fields of study for summaries and study assistance

Main summaries home pages:

Main study fields:

Main study fields NL:

Follow the author: JesperN
Work for WorldSupporter

Image

JoHo can really use your help!  Check out the various student jobs here that match your studies, improve your competencies, strengthen your CV and contribute to a more tolerant world

Working for JoHo as a student in Leyden

Parttime werken voor JoHo

Statistics
2152