Psychology Right and Left Brain

7/29/2019 Psychology Right and Left Brain

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Right Brain Left Brain

Two hemispheres with different

specializations


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Cortical similarities

KW 14-3

Contralateral control over movement

and skin sencses


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Sensory MotorIntegration

KW 10-2


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KW 14-17

Visual

Fields

Also contralateral sensation

Right visual world: left brain

Left visual world: right brain


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Dorsal and

Ventral Streams

KW p.535


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Hemispheric differences


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Auditory Cortex

KW 9-12


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Processing Music

KW 9-24


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Parietal lobe Assymetry

KW 14-14

Parietal larger Temporal larger


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Parietal lobe

damage

KW 14-15

Right: drawings, puzzles, maps

Left: language, naming objects,Copy movements


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Apraxia

KW 14-16


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Spatial Cognition

KW 14-4

Same figure but different orientation?

Yes


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Spatial Orientation

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Which block is the same as one of left?

a


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Cognitive

Tasks 1

KW 14-21

correct

Men more likely toPick correct response


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Cognitive

Tasks 2

KW 14-21


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Cognitive

Tasks 3

KW 14-21


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Cognitive

Tasks 4

KW 14-21


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Figure 14.1 Two views of the corpus callosumThe corpus callosum is a large set of axons conveying information between thetwo hemispheres. (a) A sagittal section through the human brain. (b) A dissection

(viewed from above) in which gray matter has been removed toexpose the corpus callosum.

Connecting

Link between

Hemispheres


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Visual Connections to the Hemispheres

Visual Field-what is visible at any moment

Right visual field-->left hemisphere

Left visual field-->right hemisphereCutting the Corpus Callosum

Sometimes done to treat severe epilepsy

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


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Split Brain Task 1

KW 14-18

S lit B i T k 2


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Split Brain Task 2

KW 14-19

Use left hand tofind object


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Split Brain Task 3

KW 14-19

Each hemisphere is capableof responding independently


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Visuospacial Processing

KW 14-20


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Split Hemispheres

CompetitionSoon after surgery you may see competition between activities

on the two sides of the body

Hemispheric Specialization

Left

SpeechMovement sequencing

Detail-oriented

Right

Emotional content of speech

Recognizes emotions in othersExpresses fear and anger

Spatial Relationships

Music perception

Animation


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Development of Lateralizationand Handedness

Anatomical Differences between the Hemispheres

Plenum temporale in left hemisphere larger

Corpus Callosum is not fully developed at birthHandedness does not dramatically affect lateralization

Most left-handed people have left-hemisphere or mixeddominance for speech


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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


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Brain sculpted by experience Left hemisphere for

speech

Right for spatialtasks

Both hemispheresactive

Can be resculpted ifneeded


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Brain Science has come along way

Still many mysteries to besolved

Treaments for braindiseases

Understanding the causes

Hope course has given youthe knowledge to followthese developments

Psychology Right and Left Brain

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