Right Brain Left Brain Two hemispheres with different specializations

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