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Right Brain Left Brain. Two hemispheres with different specializations. Cortical similarities. Contralateral control over movement and skin sencses. KW 14-3. Sensory Motor Integration. KW 10-2. Visual Fields. Also contralateral sensation Right visual world: left brain

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right brain left brain

Right Brain Left Brain

Two hemispheres with different specializations

cortical similarities
Cortical similarities

Contralateral control over movement

and skin sencses

KW 14-3

visual fields
Visual Fields

Also contralateral sensation

Right visual world: left brain

Left visual world: right brain

KW 14-17

parietal lobe assymetry
Parietal lobe Assymetry

Parietal larger

Temporal larger

KW 14-14

parietal lobe damage
Parietal lobe damage

Right: drawings, puzzles, maps

Left: language, naming objects,

Copy movements

KW 14-15


KW 14-16

spatial cognition
Spatial Cognition

Same figure but different orientation?

KW 14-4


spatial orientation
Spatial Orientation

Which block is the same as one of left?

KW 14-5


cognitive tasks 1
Cognitive Tasks 1


Men more likely to

Pick correct response

KW 14-21


Figure 14.1  Two views of the corpus callosumThe corpus callosum is a large set of axons conveying information between the two hemispheres. (a) A sagittal section through the human brain. (b) A dissection (viewed from above) in which gray matter has been removed to expose the corpus callosum.


Link between


visual connections to the hemispheres
Visual Connections to the Hemispheres

Visual Field-what is visible at any moment

Right visual field-->left hemisphere

Left visual field-->right hemisphere

Cutting the Corpus Callosum

Sometimes done to treat severe epilepsy

Behavior is abnormal only when sensory stimuli are limited to one side of the body

split brain task 2
Split Brain Task 2

Use left hand to find object

KW 14-19

split brain task 3
Split Brain Task 3

Each hemisphere is capable

of responding independently

KW 14-19

split hemispheres
Split Hemispheres


Soon after surgery you may see competition between activities on the two sides of the body

Hemispheric Specialization



Movement sequencing



Emotional content of speech

Recognizes emotions in others

Expresses fear and anger

Spatial Relationships

Music perception


development of lateralization and handedness
Development of Lateralization and Handedness

Anatomical Differences between the Hemispheres

Plenum temporale in left hemisphere larger

Corpus Callosum is not fully developed at birth

Handedness does not dramatically affect lateralization

Most left-handed people have left-hemisphere or mixed dominance for speech

speech and handedness
Speech and Handedness
  • First communication most likely hand signals
  • Right hand preferred most humans
  • Right hand controlled by left brain
  • Signal language tied to spoken language
  • Hand gestures to phonemes
  • Communication is left hemisphere task
brain sculpted by experience
Brain sculpted by experience
  • Left hemisphere for speech
  • Right for spatial tasks
  • Both hemispheres active
  • Can be resculpted if needed
brain science has come along way
Brain Science has come along way
  • Still many mysteries to be solved
  • Treaments for brain diseases
  • Understanding the causes
  • Hope course has given you the knowledge to follow these developments