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Biology
The Nervous System
!
!
Part 2
Nervous System
Your central
nervous system
is your brain 	

and spinal cord.
The brain
controls
behavior, and 	

the spinal 	

cord transmits
messages
between the
brain and the
body.
Nervous System
Your peripheral
nervous system
is the network 	

of nerve cells 	

that extend
throughout your
body. It has a
somatic division
(voluntary
movements) and
an autonomic
division
(involuntary
movements).
Nervous System
Your peripheral
nervous system
is the network 	

of nerve cells 	

that extend
throughout your
body. It has a
somatic division
(voluntary
movements) and
an autonomic
division
(involuntary
movements).
Somatic Division:	

- Voluntary muscle movements	

- Communication between sensory
organs and the brain
Sensory Organs:
Ears (hearing)	

Eyes (sight)	

Skin (feeling)	

Nose (smell)	

Tongue (taste)
Nervous System
Your peripheral
nervous system
is the network 	

of nerve cells 	

that extend
throughout your
body. It has a
somatic division
(voluntary
movements) and
an autonomic
division
(involuntary
movements).
Autonomic Division:	

- Involuntary movements (like breathing
and blood pressure)	

- Controls “fight or flight” response:
when the body is responding to a threat
Brain Structure
Brain Structure
• The “Old Brain” is the part of the brain that controls eating,
breathing, and sleeping. It is common to all vertebrates.	

• The evolution of the “old brain” dates back 500 million years. 	

• “The Midbrain” controls vision, hearing, motor control,
alertness, and temperature regulation.
Brain Structure
• The “New Brain” is the cerebral cortex: the outer layer of
nerve tissue in our brains. It controls memory, attention,
perceptual awareness, thought, language, and consciousness.The
cerebral cortex is the part of the brain that allows us to reason.
Brain Structure
Different lobes of the cerebral cortex are involved in different
bodily functions.A PET (positron emission tomography) scan
shows us which parts of the brain are active during different
daily activities.
Brain Structure
Frontal Lobe:
• Controls the body’s dopamine system	

• The function of the frontal lobe involves the ability to
recognize future consequences, the choice between good
and bad actions, the differentiation between bad/good/
better/best, the suppression of socially unacceptable
behavior, and the ability to determine similarities and
differences. It also helps us retain long term memories.	

!
!
!
Brain Structure
Parietal Lobe:
• Processes information derived from our senses. It
allows us to recognize objects by touch alone, manipulate
objects with our hands, and understand how objects are
positioned in space around us (spatial understanding). It
also allows us to understand and manipulate numbers.	

!
!
!
!
Brain Structure
Temporal Lobe:
• Involved in smell, sound, vision, and memory. 	

• Allows us to form, store, and retrieve long-term
memories. It includes the auditory association area,
which allows us to process sounds and comprehend
speech.This lobe gives us the ability to recognize and
name people and objects.	

!
!
!
!
Brain Structure
Occipital Lobe:
• The primary visual processing center of the brain, the
occipital lobe allows you to process and understand
what you are seeing.	

• This lobe allows us to differentiate between different
colors and perceive motion.	

!
!
!
!
!
Behavioral Genetics
The study of the effects of heredity on behavior.	

To what extent are our abilities, personality traits, sexual
orientations, sociability, and psychological disorders 	

determined by genes inherited from our parents?
Behavioral Genetics
Nature? (Genetics) or Nurture? (Environment)	

Study: Men who carry one or two extra
copies of a gene called allele 334 often
behave differently in relationships than men
who lack this gene variant. Men with an
extra copy of the gene felt a weaker, less
permanent attachment to their partners,
and were more likely to be unfaithful. Men
who had two copies of allele 334 were also
twice as likely to have had a marital or
relationship crisis in the past year than
those who lacked the gene variant. 	

(Karolinska Medical Institute, Stockholm).
Behavioral Genetics
Nature? (Genetics) or Nurture? (Environment)	

Study: Novelty-seeking
behavior (impulsive
decision-making, the
need to explore, lack
of organization) is
related to the
presence of a certain
gene in the body, and
is highly inheritable.	

(Golimbet et al., 2007).
Behavioral Genetics
Nature? (Genetics) or Nurture? (Environment)	

Study: 1,252,387 genetic markers
were tested for association with
personality traits.The results
indicated that only 1% of genetic
variants significantly contribute to
personality variation.This
indicates that individual common
genetic variants do not
significantly contribute to
personality trait variation.	

(Verweij et al., 2010)
Behavioral Genetics
Nature? (Genetics) or Nurture? (Environment)	

Twin Studies are used to help us answer the
question of “nature vs. nurture.”
Behavioral Genetics
Nature? (Genetics) or Nurture? (Environment)	

Look at pair 1:
one sibling is
adopted. 	

!
Look at pair 2:	

Identical twins.
Imagine that they
were separated at
birth and raised
in different
families.
Pair-Share
Do you think a Twin Study is a reliable way to
test whether our behavior is determined more
by nature (genetics) or nurture (environment)? 	

Why or why not?
Pair-Share
Do you think you share any personality traits
with your parents or grandparents?

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Biology: Nervous System 2

  • 2. Nervous System Your central nervous system is your brain and spinal cord. The brain controls behavior, and the spinal cord transmits messages between the brain and the body.
  • 3. Nervous System Your peripheral nervous system is the network of nerve cells that extend throughout your body. It has a somatic division (voluntary movements) and an autonomic division (involuntary movements).
  • 4. Nervous System Your peripheral nervous system is the network of nerve cells that extend throughout your body. It has a somatic division (voluntary movements) and an autonomic division (involuntary movements). Somatic Division: - Voluntary muscle movements - Communication between sensory organs and the brain Sensory Organs: Ears (hearing) Eyes (sight) Skin (feeling) Nose (smell) Tongue (taste)
  • 5. Nervous System Your peripheral nervous system is the network of nerve cells that extend throughout your body. It has a somatic division (voluntary movements) and an autonomic division (involuntary movements). Autonomic Division: - Involuntary movements (like breathing and blood pressure) - Controls “fight or flight” response: when the body is responding to a threat
  • 7. Brain Structure • The “Old Brain” is the part of the brain that controls eating, breathing, and sleeping. It is common to all vertebrates. • The evolution of the “old brain” dates back 500 million years. • “The Midbrain” controls vision, hearing, motor control, alertness, and temperature regulation.
  • 8. Brain Structure • The “New Brain” is the cerebral cortex: the outer layer of nerve tissue in our brains. It controls memory, attention, perceptual awareness, thought, language, and consciousness.The cerebral cortex is the part of the brain that allows us to reason.
  • 9. Brain Structure Different lobes of the cerebral cortex are involved in different bodily functions.A PET (positron emission tomography) scan shows us which parts of the brain are active during different daily activities.
  • 10. Brain Structure Frontal Lobe: • Controls the body’s dopamine system • The function of the frontal lobe involves the ability to recognize future consequences, the choice between good and bad actions, the differentiation between bad/good/ better/best, the suppression of socially unacceptable behavior, and the ability to determine similarities and differences. It also helps us retain long term memories. ! ! !
  • 11. Brain Structure Parietal Lobe: • Processes information derived from our senses. It allows us to recognize objects by touch alone, manipulate objects with our hands, and understand how objects are positioned in space around us (spatial understanding). It also allows us to understand and manipulate numbers. ! ! ! !
  • 12. Brain Structure Temporal Lobe: • Involved in smell, sound, vision, and memory. • Allows us to form, store, and retrieve long-term memories. It includes the auditory association area, which allows us to process sounds and comprehend speech.This lobe gives us the ability to recognize and name people and objects. ! ! ! !
  • 13. Brain Structure Occipital Lobe: • The primary visual processing center of the brain, the occipital lobe allows you to process and understand what you are seeing. • This lobe allows us to differentiate between different colors and perceive motion. ! ! ! ! !
  • 14. Behavioral Genetics The study of the effects of heredity on behavior. To what extent are our abilities, personality traits, sexual orientations, sociability, and psychological disorders determined by genes inherited from our parents?
  • 15. Behavioral Genetics Nature? (Genetics) or Nurture? (Environment) Study: Men who carry one or two extra copies of a gene called allele 334 often behave differently in relationships than men who lack this gene variant. Men with an extra copy of the gene felt a weaker, less permanent attachment to their partners, and were more likely to be unfaithful. Men who had two copies of allele 334 were also twice as likely to have had a marital or relationship crisis in the past year than those who lacked the gene variant. (Karolinska Medical Institute, Stockholm).
  • 16. Behavioral Genetics Nature? (Genetics) or Nurture? (Environment) Study: Novelty-seeking behavior (impulsive decision-making, the need to explore, lack of organization) is related to the presence of a certain gene in the body, and is highly inheritable. (Golimbet et al., 2007).
  • 17. Behavioral Genetics Nature? (Genetics) or Nurture? (Environment) Study: 1,252,387 genetic markers were tested for association with personality traits.The results indicated that only 1% of genetic variants significantly contribute to personality variation.This indicates that individual common genetic variants do not significantly contribute to personality trait variation. (Verweij et al., 2010)
  • 18. Behavioral Genetics Nature? (Genetics) or Nurture? (Environment) Twin Studies are used to help us answer the question of “nature vs. nurture.”
  • 19. Behavioral Genetics Nature? (Genetics) or Nurture? (Environment) Look at pair 1: one sibling is adopted. ! Look at pair 2: Identical twins. Imagine that they were separated at birth and raised in different families.
  • 20. Pair-Share Do you think a Twin Study is a reliable way to test whether our behavior is determined more by nature (genetics) or nurture (environment)? Why or why not?
  • 21. Pair-Share Do you think you share any personality traits with your parents or grandparents?