Biological Psychology Biological Roots of Behavior How the Brain Governs Behavior Neurotransmitters.
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Transcript of Biological Psychology Biological Roots of Behavior How the Brain Governs Behavior Neurotransmitters.
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Biological Psychology
Biological Roots of BehaviorHow the Brain Governs Behavior
Neurotransmitters
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“So why do we have to study biology in a psych class?”
• Let me use Phineas Gage to help answer this question…
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“He was no longer Gage…”
• Several different angles of where the rod passed through his skull
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There is a Phineas Gage display in the Warren Medical Museum at Harvard University
• This is what went through his brain (see below)…
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Biological Roots of Behavior
• Franz Gall (1758-1828) – Austrian physicist who invented phrenology
• He felt that bumps on the skull could reveal our mental abilities and character traits.
• Introduced as being scientific but its use was exploited by quacks on gullible individuals
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Biological Roots of Behavior
• Became similar to that of astrology, palm-reading and tarot
• Although, ill-fated theory was laughed at by scientific community of that day – it may have had some validity
• Localization of brain functions somehow hit the mark
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The Nervous System
• Electrochemical communication system that enables us to think, feel, and behave.
• Complex beyond comprehension• Although, human brains are more
complex our nervous systems and those of animals operate in a similar fashion – advantage of this is experimentation
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The Nervous System
• Allows researchers to study simple animals such as squids and sea slugs to help us better understand the organization of our own brains
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Divisions of the Nervous System
• Consists of two systems– Central Nervous System
• Brain and spinal cord– Peripheral Nervous System
• Which connects the CNS to the rest of the body
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Organization of the Nervous SystemOrganization of the Nervous System
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Peripheral Nervous System
• Two components: – Somatic Nervous System
• Transmits sensory input to the CNS from the outside world and directs motor output
– Autonomic Nervous System• Controls glands and muscles of our
internal organs – “automatic pilot”
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Autonomic Nervous System
• Dual system:– Sympathetic Nervous System
• Arouses the body– Parasympathetic Nervous System
• Calms us down
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Neurons
• Nerve cells (building blocks) – essentially identical to animals – Small samples of brain tissue from a person
and a monkey are basically indistinguishable
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Endocrine System: Taking the slow lane
• Unlike the speedy nervous system which zips messages from eyes to brain to hand in a fraction of a second, endocrine messages use the slow lane
• May take several seconds or more as bloodstream carries a hormone from an endocrine gland to its target tissue
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Endocrine System
• Hormones are chemical messengers
• Influence all aspects of our lives – growth, metabolism, reproduction, moods, etc.
• Strives for homeostasis (balance) by responding to stress, exertion, internal thoughts, etc.
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The Brain
• Studying the brain:– Clinical observations– Manipulating the brain
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How does the brain govern behavior?
• 3 Principle layers of the brain: (1) Brainstem (2) Limbic System
• Hippocampus• Amygdala• Hypothalamus
(3) Cerebral Cortex
The Whole Brain Atlas
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What the Brain Controls
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The Lobes of the Brain
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A Positron Emission Tomography Scanner (PET)
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So we can understand how people get……..
Murderous mind? A PET scan reveals less activity in the prefrontal cortex of a convicted killer (right)than in that of a nonviolent control.
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A Pet Scan of a Depressed Patient
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A PET Scan of a Schizophrenic Patient
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Brainstem (or Hindbrain)
• The brain’s innermost region…– Begins where the spinal cord enters the
skull and swells slightly forming the medulla
– Towards the rear of the brainstem is the cerebellum – this is linked to memory and its major function is muscular control
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Limbic System
• Hippocampus – This structure plays a key role in allowing
us to store new information– Problems here may cause Alzheimer's –
these individuals have trouble processing declarative memories
– Milner (1968): the classic case of H.M.
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Limbic System
• Amygdala– Emotional control center of the brain –
major influence on aggression and fear– Emotional memories as well– Alzheimer’s ???
• Kluver and Bucy (1939)• Demasio (1994)
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Limbic System
• Hypothalamus– Major influence on hunger, thirst, body
temperature, and sexual behavior• Olds and Milner (1954)
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Cerebral Cortex
• Makes us distinctively human – much higher developed than in animals– Motor Cortex – involved in the conscious initiation
of voluntary movements in specific parts of the body including hand, knee, foot and head
• Fritsch and Hitzig (1870)• Delgado (1969a)• Delgado (1969b)• Penfield (1975)
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Cerebral Cortex
• Sensory Cortex – receives information from our senses– Visual cortex
• visual info– Auditory cortex
• auditory info– Somatosensory cortex
• info from skin• Association cortex
– involved in complex cognitive tasks associating words with images
• Broca’s area (aphasia)• Wernicke’s area (aphasia)
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Neurons
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More Neurons
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And just one more!!
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Neurotransmitters
• Neurotransmitters are chemicals made by neurons and used by them to transmit signals to the other neurons
• A chemical message telling the next cell to fire or not to fire its own action potential
• More than 200 in our body all with different functions
• Lets briefly discuss some of the most important ones…
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Serotonin
• Facilitates a relaxed, sleepy feeling • Tryptophan which is an amino acid
found in dairy products and turkey is converted into serotonin in the body
• So, insomnia sufferers may be smart to listen to grandmother’s suggestion to drink a warm glass of milk before going to bed
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Some Illnesses Associated With Serotonin
• Too low levels in depression and anxiety sufferers
• Obesity may also be associated with low levels
• Linked to aggression as well -- low levels in the brains of suicide victims
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Dopamine
• High levels lead to pleasure– Makes person feel happy and active
• Dopamine raises the body's temperature and increases metabolic rate
• Gives you euphoric feelings and allows you to be active
• Drug and alcohol abuse will block dopamine receptors and therefore a person needs to take more to get the same effect
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Illnesses Associated With Dopamine
• Parkinson’s Disease – too low levels
• Schizophrenia – too high levels
• Tourette’s disorder – too high levels
• Huntington’s disease – too high levels
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Norepinephrine
• Plays a role in attention and arousal
• Used by sympathetic nervous system to prepare us for action
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Illnesses Associated With Norepinephrine
• Depression – chronic stress depletes this neurotransmitter
and can lead to depression
• Note:– Aerobic Exercise is found to protect the
brain from this depletion – so go out and run a mile or two if your down in the dumps
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Epinephrine
• Involved in energy and glucose metabolism
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Illnesses Associated With Epinephrine
• Depression – too low levels
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Acetylcholine
• Involved in voluntary movement, learning, memory, and sleep
• Helps parasympathetic nervous system to slow our heart rate
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Illnesses Associated With Acetylcholine
• Alzheimer’s disease – too low levels
• Note:– Unfortunately, drugs used to increase
acetylcholine to help restore normal levels appear to have small effects on improving memory
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GABA
• Inhibits excitation and anxiety
• Appears directly related to anxiety reduction
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Illnesses Associated With GABA
• Anxiety disorders – too low levels• Huntington’s Disease – too low levels
– GABA systems aren’t working and this allows dopamine systems to run wild
– Huntington's disease is a hereditary disorder characterized by memory loss, abnormal movement and premature death• It affects 1 in 10,000 people, and children with an
affected parent have a 50 percent chance of developing the disease
• Epilepsy – too low levels
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Glutamate
• Main excitatory neurotransmitter in the brain
• Very important in learning and memory
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Illnesses Associated With Glutamate
• Alzheimer’s disease – too low levels in hippocampus
• Strokes – too high levels can cause neurons to die
• ALS (Lou Gehrig’s Disease) – causes death in neurons in the spinal cord and brainstem
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Endorphins
• Involved in pain reduction and pleasure
• They enhance the release of dopamine
• These natural opiates are released in response to pain and vigorous exercise
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Illnesses Associated With Endorphins
• Use of artificial opiates can cause body to stop manufacturing its own – this can lead to drug addiction