neuroscience and behavior. history of mind 2 in 1800, franz gall suggested that bumps of the skull...
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NEUROSCIENCE AND BEHAVIOR
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History of Mind2
In 1800, Franz Gall suggested that bumps
of the skull represented mental abilities. His theory,
though incorrect, nevertheless proposed that different mental
abilities were modular.
Phrenology
Bettm
an/ Corbis
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Neural Communication
The body’s information system is built from billions of interconnected cells called neurons.
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Neuron
A nerve cell, or a neuron, consists of many different parts.
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Action PotentialA neural impulse. A brief electrical charge that travels down an axon and is generated
by the movement of positively charged atoms in and out of channels in the axon’s
membrane.
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Threshold 6
Threshold: Each neuron receives excitatory and inhibitory signals from many neurons. When the excitatory signals minus the inhibitory signals
exceed a minimum intensity (threshold) the neuron fires an action potential.
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Synapse
Synapse [SIN-aps] a junction between the axon tip of the sending neuron and the
dendrite or cell body of the receiving neuron. This tiny gap is called the synaptic gap or
cleft.
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Neurotransmitters
Neurotransmitters (chemicals) released
from the sending neuron travel across the synapse and bind to receptor sites on
the receiving neuron, thereby influencing it to generate an action
potential.
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Neurotransmitters9
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Nervous System10
CentralNervousSystem(CNS)
PeripheralNervousSystem(PNS)
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The Nervous System11
Nervous System: Consists of all the nerve cells. It is the body’s speedy, electrochemical communication system.
Central Nervous System (CNS): the brain and spinal cord.
Peripheral Nervous System (PNS): the sensory and motor neurons that connect the central nervous system (CNS) to the rest of the body.
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The Nervous System12
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Kinds of Neurons13
Sensory Neurons carry incoming information from the sense receptors to the CNS. Motor Neurons
carry outgoing information from the CNS to muscles and glands. Interneurons connect the two neurons.
Sensory Neuron(Bipolar)
Interneuron Neuron (Unipolar)
Motor Neuron(Multipolar)
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Peripheral Nervous System14
Somatic Nervous System: The division of the peripheral nervous system that controls the body’s skeletal muscles.
Autonomic Nervous System: Part of the PNS that controls the glands and other muscles.
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Autonomic Nervous System (ANS)
Sympathetic NS “Arouses”
(fight-or-flight)
Parasympathetic NS “Calms”
(rest and digest)
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Central Nervous System
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The Brain and Neural Networks
Complex Neural Network
Interconnected neurons form networks in the brain. Theses networks are complex and modify with growth and experience.
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Central Nervous System
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The Spinal Cord and Reflexes
Simple Reflex
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The Endocrine System18
The Endocrine System is the body’s “slow”
chemical communication
system. Communication is
carried out by hormones
synthesized by a set of glands.
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Hormones19
Hormones are chemicals synthesized by the endocrine glands that are secreted in the
bloodstream. Hormones affect the brain and many other tissues of the body.
For example, epinephrine (adrenaline) increases heart rate, blood pressure, blood
sugar and feelings of excitement during emergency situations.
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The Brain: Older Brain Structures
The Brainstem is the oldest part of the brain, beginning where the spinal cord swells and enters the skull. It is responsible for automatic survival
functions.
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Brainstem
The Medulla [muh-DUL-uh] is the base
of the brainstem that controls heartbeat
and breathing.
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Brainstem
The Thalamus [THAL-uh-muss] is the brain’s sensory switchboard, located on top of the brainstem. It directs
messages to the sensory areas in the cortex and transmits
replies to the cerebellum and
medulla.
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Brainstem
Reticular Formation is a nerve network in the brainstem that plays an important role in controlling
arousal.
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Cerebellum24
The “little brain” attached to the rear of the brainstem. It
helps coordinate voluntary movements
and balance.
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The Brain25
A brain lesion experimentally
destroys brain tissue to study animal behaviors after such destruction.
Techniques to Study the Brain
Hubel (1990)
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Clinical Observation26
Clinical observations have shed light on a number of brain disorders. Alterations in brain
morphology due to neurological and psychiatric diseases are now being catalogued.
Tom
Landers/ B
oston Globe
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Electroencephalogram (EEG)27
An amplified recording of the electrical waves sweeping across the brain’s surface, measured by electrodes placed on the scalp.
AJ P
hoto/ Photo R
esearchers, Inc.
GPS – http://www.sciencedaily.com/videos/2007/0909-
gps_for_the_brain.htm
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PET Scan28
PET (positron emission tomography)
Scan is a visual display of brain
activity that detects a radioactive form of glucose while the
brain performs a given task.
Light Scan http://www.sciencedaily.com/videos/
2007/1204-baby_thinking.htm
Courtesy of N
ational Brookhaven N
ational Laboratories
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MRI Scan29
MRI (magnetic resonance imaging) uses magnetic fields and radio waves to produce computer-
generated images that distinguish among
different types of brain tissue. Top images show ventricular enlargement in a
schizophrenic patient. Bottom image shows brain regions when a
participants lies.http://www.sciencedaily.com/
videos/2005/0711-inside_the_brain.htm
Both photos from Daniel Weinberger, M.D., CBDB, NIMH
James Salzano/ Salzano Photo Lucy Reading/ Lucy Illustrations
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The Limbic System30
The Limbic System is a doughnut-shaped system of neural
structures at the border of the brainstem and cerebrum, associated with emotions such as fear, aggression and
drives for food and sex. It includes the hippocampus, amygdala, and hypothalamus.
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Amygdala
The Amygdala [ah-MIG-dah-la] consists of two lima bean-sized neural clusters linked to the emotions of fear and
anger.
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Hypothalamus
The Hypothalamus lies below (hypo) the thalamus. It directs several maintenance activities like eating,
drinking, body temperature, and
control of emotions. It helps govern the
endocrine system via the pituitary gland.
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The Cerebral Cortex
The intricate fabric of interconnected neural cells that covers the cerebral hemispheres. It is the body’s ultimate control and information processing center.
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Structure of the Cortex
Each brain hemisphere is divided into four
lobes that are separated by
prominent fissures. These lobes are the
frontal lobe (forehead), parietal lobe (top to rear head), occipital lobe (back head) and temporal lobe (side of
head).
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Functions of the Cortex
The Motor Cortex is the area at the rear of the frontal lobes that control voluntary movements. The Sensory Cortex (parietal cortex) receives
information from skin surface and sense organs.
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Visual Function
The functional MRI scan shows the visual cortex is active as the subject looks at faces.
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Courtesy of V
.P. Clark, K
. Keill, J. M
a. M
aisog, S. Courtney, L
.G.
Ungerleider, and J.V
. Haxby,
National Institute of M
ental Health
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Auditory Function
The functional MRI scan shows the
auditory cortex is active in patients who
hallucinate.
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Language
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Aphasia is an impairment of language, usually caused by left hemisphere damage either to Broca’s area (impaired speaking)
or to Wernicke’s area (impaired understanding).
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The Amazing Brain
Kim Peek - blister on left
hemisphere ( language & motor skills)
- no corpus callosum - not walk until age 4 - memorize what read - able to graduate high
school at 14 - number ability
amazing
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The Brain’s Plasticity
The brain is sculpted by our
genes but also by our experiences.
Plasticity refers to the brain’s ability to modify itself after
some types of injury or illness.
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Splitting the Brain41
A procedure in which the two hemispheres of the brain are isolated by cutting the connecting fibers
(mainly those of the corpus callosum) between them.
Corpus Callosum
Martin M
. Rother
Courtesy of T
erence William
s, University of Iow
a
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Severed Corpus Callosum
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Split Brain Patients
With the corpus callosum severed, objects (apple) presented in the right visual field can be named.
Objects (pencil) in the left visual field cannot.
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Try This!44
Try drawing one shape with your left hand and one with your right hand,
simultaneously.B
BC
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Non-Split Brains45
People with intact brains also show left-right hemispheric differences in mental
abilities.
A number of brain scan studies show normal individuals engage their
-right brain when completing a perceptual task
-left brain when carrying out a linguistic task.