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Chapter 6- Body and Behavior. The Nervous System. Controls emotions, thinking, movements, and behavior Two Parts Central Nervous System (CNS)- brain and spinal cord Peripheral Nervous System (PNS)- smaller nerves that reach other parts of the body

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Chapter 6- Body and Behavior

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Chapter 6 body and behavior

Chapter 6- Body and Behavior

The nervous system

The Nervous System

  • Controls emotions, thinking, movements, and behavior

  • Two Parts

    • Central Nervous System (CNS)- brain and spinal cord

    • Peripheral Nervous System (PNS)- smaller nerves that reach other parts of the body

  • All parts are protected by sheathing and vertebrae (injury could lead to paralysis)



  • Long, thin, cells of nerve tissue along which messages travel to and from the brain

  • Transmission occurs when neurons are stimulated past a minimum point and emit a signal

    • All-or-none principle- neurons fire at full length only

Basic neuron parts

Basic Neuron Parts

  • Cell Body- Contains the nucleus and produces energy

  • Dendrites- receive impulses or messages from other neurons and send to cell body

Basic neuron parts1

Basic Neuron Parts

  • Axon- long fiber that carries impulses away from the cell body towards the dendrites of the next neuron

  • Myelin Sheath- protects the axon

  • Axon Terminals- opposite dendrite of another neuron

Basic neuron parts2

Basic Neuron Parts

The neuron connection

The Neuron Connection

  • Synapse- the space between the axon terminals of one neuron and the dendrites of another neuron

The neuron connection1

The Neuron Connection

  • A neuron transmits its impulses or message to another neuron across the synapse by releasing chemicals called neurotransmitters.

  • Can either:

    • Excite the next neuron

    • Stop it from transmitting (inhibit)

  • Only allow flow in one direction





  • Norepinephrine- involved with memory and learning

  • Endorphins- inhibit pain- “inside morphine”

  • Too much or too little is linked to certain diseases

    • Undersupply of acetylcholine(memory and movement)- Alzheimer's

    • Oversupply of dopamine (learning, emotional arousal)- Schizophrenia

    • Undersupply of dopamine- Parkinson’s disease

    • Undersupply of norepinephrine and serotonin- depression

Neuron activity

Neuron Activity

Intensity of activity in each neuron depends on how many other neurons are acting on it

Each individual neuron is either

ON or OFF depending on

whether most of the neurons

acting on it are either exciting

or inhibiting

Neuron activity1

Neuron Activity

Afferent neurons- relay messages from the sense organs to the brain

Efferent neurons- relay messages from brain to glands and muscles

Interneurons- carry impulses between neurons

Voluntary and involuntary activities

Voluntary and Involuntary Activities

  • Parts of the Peripheral Nervous Nervous System

  • Somatic Nervous System (SNS)- voluntary activities

  • Autonomic Nervous System (ANS)- involuntary activities

    • Sympathetic- prepares for emergencies or strenuous activity

      • Increases HR and BP, suspends digestion

    • Parasympathetic- conserves energy and enhances recovery from strenuous activity

      • Reduces HR and BP

The three brains hindbrain

The Three Brains: Hindbrain

  • Includes the

  • Cerebellum- posture, balance, voluntary movements

  • Medulla- breathing, heart rate, reflexes

  • Pons- bridge between spinal cord and brain, also helps in sleep

The three brains midbrain

The Three Brains: Midbrain

  • Integrates sensory information and regulates it upward

  • Brain stem= medulla +pons +midbrain

  • Reticular Activating System- plays a role in the sleep cycle

The three brains forebrain

The Three Brains: Forebrain

  • Thalamus- integrates sensory input (except smell)

  • Hypothalamus- hunger, thirst, sexual behavior, changes in temp.

  • Cerebral cortex- learning and storing information, projecting information

  • Limbic System- core of forebrain- includes above and:

  • Amygdala- violent emotions

  • Hippocampus- forming new memories

The lobes of the brain

The Lobes of the Brain

  • The cerebrum is two hemispheres connected by a band of fibers called the corpus collosum

  • Divided into lobes

    • Occipital- visual

    • Parietal- senses from all over the body

    • Temporal- hearing, memory, speaking

    • Frontal- organization, planning

Chapter 6 body and behavior





Left and right hemispheres

Left and Right Hemispheres

  • Properties of the two sides have been simplified

  • Complement and help each other

  • Each side is connected to one half of the body in a criss-cross pattern

  • Left side- speech, math, logic, understanding

  • Right side- visual, spatial ability (puzzles), creativity, music

Split brain operations

Split Brain Operations

When people are prone to grand mal seizures, separating the brain hemispheres will make them more severe

Side effects: seem normal

… but, if a man whose brain has been split holds a ball in his right hand, he will be able to say it is a ball, but in his left hand, he will not be able to say what it is. Information cannot cross to the speech center in the left hemisphere

Studying the brain

Studying the Brain

  • Recording:

    • Inserting electrodes (wires) into the brain- record activity

    • EEG- can record activity of large portions of the brain

      • Rhythmic pattern that depends on whether a person is awake, drowsy, or asleep

Studying the brain1

Studying the Brain

  • Stimulation- causing neurons to fire

    • Use during brain surgery to find the malfunctioning part

      • By applying an electric current

        to the temporal lobe, can

        trigger memory sequences

        • One woman believed that a

          radio was being played in

          the operating room

          ** Pain relief without drugs

Studying the brain2

Studying the Brain

  • Lesions- cutting or destroying part of an animal’s brain

    • Difference in behaviors

    • Removing part of the temporal lobe of monkeys made them less fearful and violent- aggression

      • Far more complex than people thought at first

Studying the brain3

Studying the Brain

  • Accidents- Phineas Gage

    • Railroad foreman who had a 13 pound, three foot long iron bar go through his skull (1848)

    • Survived, but suffered personality changes- was short tempered and said inappropriate things

    • In 1994, realized that damage had been done to the frontal cortex, which censors

      thoughts and ideas

Chapter 6 body and behavior

CT Scans: An x-ray of the brain.

A CT scan is essentially a computerized assembly of several x-ray images taken from a series of different angles. With a CT, the resolution is much better than conventional x-rays, and the detail that can be seen is much greater.

**Can pinpoint brain injuries and deterioration

Chapter 6 body and behavior









PET measures the emission of positrons from the brain after a small amount of radioactive isotopes, or tracers,  have been injected into the blood stream.  A common example is a glucose-relative with embedded fluor-18.   With this molecule, the activity of different regions of the brain can be measured.  The result is a three-dimentional map with the brain activity represented by colors.

Chapter 6 body and behavior


  MRI is a noninvasive imaging technique that does not use x-rays.   The process involves passing a strong magnetic field through the head.  The magnetic field used is 30,000 + times that of the earth's magnetic field.  It's effect on the body, however, is harmless and temporary.  The MRI scanner can detect radiation from certain molecules, which are present in different concentrations in different tissues. 

The endocrine system

The Endocrine System

  • A chemical communication system that uses hormones to send chemical messages through the bloodstream

    • Produced in the endocrine glands

    • Site specific

    • Released directly into the bloodstream

    • Affect growth, metabolic processes, determine gender, secreting during stress, influence mood and drives

The pituitary gland

The Pituitary Gland

  • Center of control of the endocrine system that secretes a large number of hormones

  • Monitored by the hypothalamus

The thyroid gland

The Thyroid Gland

  • Produces thyroxine- stimulates chemical reactions important for all tissues

    • Too little- lethargic

    • Too much- overactivity

Sex glands

Sex Glands

  • Testes and ovaries

  • Produces testosterone, estrogen, and progesterone

Hormones vs neurotransmitters

Hormones vs. Neurotransmitters

  • The same chemical (norepinephrine) can be used as both

    • Neurotransmitter- released right beside the cell it will excite or inhibit

    • Hormone- released into the blood and diffused without the body

Heredity and environment

Heredity and Environment

  • Heredity- the genetic transmission of characteristics from parents to offspring

  • Genes- the basic units of heredity, can interact with environment to cause behavior

  • Nature vs. Nurture

    • Galton- success runs in families

    • Watson- “give me a dozen healthy infants and I’ll guarantee to take any one at random and train him to be any specialist I might select”

Twin studies

Twin Studies

  • Identical Twins- develop from a single fertilized egg (monozygotic) and share the same genes

  • Fraternal Twins- come from two different eggs fertilized by two different sperm

  • Minnesota Twin Study- share many common behaviors despite different social, cultural, and economic backgrounds

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