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BRAIN!!!Growing New Brain Cells?

How do we know about How do we know about the brain?the brain?

Brain Scans

Electroencephalogram Electroencephalogram (EEG)(EEG)

•Electrodes are placed on the scalp that amplify recordings of the waves of electrical activity across the brain’s surface

Computed Tomography (CT or Computed Tomography (CT or CAT Scan)CAT Scan)

•A series of X-ray photographs taken from different angles and combined by computer into a composite representation of the brain

Position Emission Position Emission Tomography (PET Scan)Tomography (PET Scan)

•A visual display of brain activity that detects where a radioactive form of glucose goes while the brain performs a given task

Language Development and PET Scans

Magnetic Resonance Magnetic Resonance Imaging (MRI)Imaging (MRI)

•A technique that uses magnetic fields and radio waves to produce computer-generated images that allow us to see structures within the brain

• Accidents• Case study analysis of victims

who suffer from a brain injury, resulting in variations in normal behavior

• Phineas Gage

LesionsLesions• Lesioning is the removal or

destruction of part of the brain.• IE. Lobotomy

Parts of the Parts of the BrainBrain

Cerebral CortexCerebral Cortex• The body’s ultimate control and

information processing center• Covers the brain’s lower level structures• Contains an estimated 30 billion nerve

cells• Divided into two hemispheres and four

lobes, connected by a thick band of nerve fibers called the corpus callosum

Top View of the Right and Left Top View of the Right and Left HemispheresHemispheres

Hemispheres of the BrainHemispheres of the Brain

Right Side - Left SideRight Side - Left Side• The right side of the brain controls

muscles on the left side of the body• The left side of the brain controls

muscles on the right side of the body. • Damage to one side of the brain will

affect the opposite side of the body.

Hemispheric Hemispheric DifferencesDifferences

Hemispheric DifferencesHemispheric Differences

• Both sides continually communicate via the corpus callosum.

Hemispheric Hemispheric Differences: Differences:

Language and Language and Spatial AbilitiesSpatial Abilities

The Brain’s Left HemisphereThe Brain’s Left Hemisphere

• Language • Math • Logic • Analytic Thought• Scientific Thought• Reasoning

The Brain’s Right HemisphereThe Brain’s Right Hemisphere

• Spatial abilities • Face recognition • Visual imagery • Music • Creativity• Emotional Instincts

Side View of the Left Side View of the Left HemisphereHemisphere

Right and Left Frontal LobesRight and Left Frontal Lobes• The portion of the cerebral cortex

lying just behind the forehead• Mostly involved in abstract

thought, speaking, muscle movements, making plans, and judgments

The Frontal LobesWhere is Morality?

Pre-Frontal Lobe Development of Children

•The motor cortex controls voluntary movements

•The motor cortex receives messages from the rest of the brain and then sends messages back to the muscles of the body in order to control voluntary movements.

Right and Left Parietal LobesRight and Left Parietal Lobes

• Regions available for general processing, including mathematical reasoning

• The parietal lobes play important roles in integrating sensory touch information, and in the handling and manipulation of objects.

Sensory Motor Integration

•The sensory cortex registers and processes touch sensations.

Right and Left Occipital LobesRight and Left Occipital Lobes

•The primary visual processing area

•Located in the back of the head

Right and Left Temporal LobesRight and Left Temporal Lobes

• Includes the auditory cortex where sound information is processed

• Located roughly above the ears

The Inner Brain

CerebellumCerebellum

• Latin for the “little brain”

• Located in the rear of the brain

• Helps coordinate voluntary movements and balance

• If damaged, the person could perform basic movements but would lose fine coordination skills.

BrainstemBrainstem• The oldest part of the brain

– The Midbrain– Pons– Medulla

• Is responsible for automatic survival functions

• Located where the spinal cord swells and the brain just begins

MidbrainMidbrain

•The MIDBRAIN is also responsible for behaviors associated with hearing and sight

•Pupil dilation and eyeball movement

PONSPONS

•The PONS is responsible for helping to regulate breathing, to help with sleep and wake cycles, and controls facial expressions

MedullaMedulla

• The base of the brainstem

• Controls life-supporting functions like heartbeat and breathing

• Damage to this area can lead to death.

ThalamusThalamus

• Sits atop the brainstem

• The brain’s sensory switchboard – receives input and directs messages to the sensory processing areas in the cortex

Limbic SystemLimbic System

• A ring of structures around the thalamus; at the border of the brainstem and cerebral cortex

• Includes:– Hypothalamus

– Hippocampus

– Amygdala

HypothalamusHypothalamus

• Located directly under the front of the thalamus

• Regulates eating, drinking, body temperature, and the fight or flight reactions to stress

• Plays a role in emotions, pleasure, and sexual function

HippocampusHippocampus

• Wraps around the back of the thalamus

• Plays a role in processing new memories for permanent storage

• Looks something like a seahorse

– Hippo is Greek for “horse.”

AmygdalaAmygdala

• Two almond shaped structures

• Controls emotional responses such as fear and anger

Click the brain for a review Click the brain for a review of the brainof the brain

Brain PlasticityBrain Plasticity

Module 8: The BrainModule 8: The Brain

PlasticityPlasticity• The ability of the The ability of the brain tissue to take brain tissue to take on new functionson new functions

• Greatest in Greatest in childhoodchildhood

• Important if parts of Important if parts of the brain are the brain are damaged or damaged or destroyeddestroyed

• Go to the next slide to see a video about brain plasticity! (may take a few seconds to load – be patient – click only once to load the

video – then wait!

The BrainThe Brain• Basic Brain Functions