Right Brain Left Brain
Two hemispheres with different specializations
Cortical similarities
KW 14-3Contralateral control over movement
and skin sencses
Sensory Motor Integration
KW 10-2
KW 14-17
Visual Fields
Also contralateral sensationRight visual world: left brainLeft visual world: right brain
Dorsal and Ventral Streams
KW p.535
Hemispheric differences
Auditory Cortex
KW 9-12
Processing Music
KW 9-24
Parietal lobe Assymetry
KW 14-14
Parietal larger Temporal larger
Parietal lobe damage
KW 14-15
Right: drawings, puzzles, maps
Left: language, naming objects,Copy movements
ApraxiaKW 14-16
Spatial Cognition
KW 14-4
Same figure but different orientation?
Yes
Spatial Orientation
KW 14-5
Which block is the same as one of left?
a
Cognitive Tasks 1
KW 14-21
correct
Men more likely to Pick correct response
Cognitive Tasks 2
KW 14-21
Cognitive Tasks 3
KW 14-21
Cognitive Tasks 4
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.
Connecting
Link between
Hemispheres
Visual Connections to the Hemispheres
Visual Field-what is visible at any momentRight visual field-->left hemisphereLeft visual field-->right hemisphere
Cutting the Corpus CallosumSometimes done to treat severe epilepsyBehavior is abnormal only when sensory stimuli are
limited to one side of the body
Split Brain Task 1
KW 14-18
Split Brain Task 2
KW 14-19
Use left hand to find object
Split Brain Task 3
KW 14-19
Each hemisphere is capableof responding independently
Visuospacial Processing
KW 14-20
Split HemispheresCompetition
Soon after surgery you may see competition between activities on the two sides of the body
Hemispheric SpecializationLeft
SpeechMovement sequencingDetail-oriented
RightEmotional content of speechRecognizes emotions in othersExpresses fear and angerSpatial RelationshipsMusic perception
Animation
Development of Lateralization and Handedness
Anatomical Differences between the HemispheresPlenum temporale in left hemisphere largerCorpus Callosum is not fully developed at birth
Handedness does not dramatically affect lateralizationMost left-handed people have left-hemisphere or mixed
dominance for speech
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 Left hemisphere
for speech Right for spatial
tasks Both hemispheres
active Can be resculpted
if needed
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