the biology of behavior biology of behavior (8-10% of the ap exam)
TRANSCRIPT
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The Biology of Behavior
Biology of Behavior (8-10% of the AP Exam)
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Before we start. . .
A website to help you review.
It’s COOL!
http://www.g2conline.org/
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The Neuron
Basic info Structure
Click icon to add picture
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Trans parency
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The Electrochemical Process
The neuron is adapted for sending and receiving
signals.This is done within and
between neurons.HOW?
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Within the cell, the nature of the neural impulse is electrical.
All-or-nothing Principle
Impulse along the axon is called axonal transmission
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The nature of the neural impulse is electrical.
The neuron at rest is more negative inside the cell membrane relative to outside the membrane. The resting neural potential is about -70 mV.
The resting potential results from the selective permeability of the membrane, the presence of electrically charged particles called ions near the inside and outside surfaces of the membrane and resulting concentration and electrical gradients. The sodium potassium pump and blocking of ionic channels by calcium ions help maintain the resting potential.
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The nature of the neural impulse is electrical
When sufficiently stimulated (to threshold) a net flow of sodium ions into the cell occurs (along with the movement of potassium ions out).
The potential rapidly reverses its polarity to typically +40mV very briefly.
The brief change in potential is call the action potential. This neural impulse travels down the length of the axon to the axon terminals.
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The nature of the neural impulse is electrical
The more intense a stimulus, the more frequent a neuron fires.
A brief period of time, called the refractory period, follows the polarization changes during which the neuron is resistant to a retriggering of an action potential.
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The chemical process is via neurotransmitters
Dozens of chemicals have been identified that
perform different functions in the brain.
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Basic Neurotransmitters
Acetylcholine (ACh)
Controls skeletal muscles
Contributes to the regulation of attention, arousal and memory
Some ACh receptors are stimulated by nicotine
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Dopamine (DA)
Contributes to control of voluntary movement, pleasurable emotions
Decreased levels associated with Parkinson’s Disease
Overactive at DA synapses associated with schizophrenia
Cocaine and amphetamines elevate activity at DA synapses
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Norepinephrine (NE)
Contributes to modulation of mood and arousal
Cocaine and amphetamines elevate the activity at NE synapses
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SerotoninInvolved in regulation of sleep and wakefulness, eating and aggression
Abnormal levels may contribute to depression and OCD
Prozac and similar antidepressant drugs affect serotonin circuits
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Gamma-aminobutyic acid
(GABA)
Serves as widely distributed inhibitory transmitter
Valium and similar antianxiety drugs work at GABA synapses
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EndorphinsResemble opiate drugs in structure and effect
Contribute to pain relief and perhaps to some pleasurable emotions
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The communication between cells is chemical.
More about that. . .
Lock and Key http://www.biologyinmotion.com/minilec/lock.html
Excitatory and Inhibitory Increases the likelihood that neuron will fire Decreases the likelihood that neuron will fire
Agonist and Antagonist A chemical that mimics the neurotransmitter A chemical that opposes the action of a neurotransmitter
Reuptake Process by which neurotransmitters are sponged up
from synapse by the presynaptic membrane
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The Reflex Arc
Types of sensory receptors (get information from the environment). There are four types . . .
The simplest form of a behavior is called a reflex.
We need to know the basic types of neurons.
Mnemonic is SAME.
Take a look
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HOW LONG DOES THIS TAKE?
ACTIVITY WITH REACTION TIME.
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Fun with neurons
Fuzzy Neuron
Field Trip Preparation (look up terms)
Field Trip
AV The Mind #5 Endorphins
The Mind #5
Neuron 1:30
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Fantastic Website!!!
http://www.g2conline.org/2022
3-D brain and neuron for explanation and study
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The Brain
Structure and Function
Structure and Function
Structure and Function
Structure and Function
Structure and Function
Pinkie and the Brain
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Organization of the Brain
How can we describe the brain?Neural tissue
description(the look)Location description(the
place)NAT GEO photo gallery
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General divisions of the nervous system
Peripheral Nervous System (PNS)
Somatic Nervous SystemAutonomic Nervous System
Sympathetic Nervous System
Parasympathetic Nervous System
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Central Nervous System (CNS)Spinal CordThe Brain
Reptilian BrainOld Mammalian BrainNew Mammalian Brain
(Neocortex)
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Localization of function of the human brain
Structure and Function, Structure and Function
Subcortical areasStructure and FunctionStructure and FunctionStructure and Function
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Neocortex
The look
The lobes
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A review
Carl Sagen 11 mins
NAT GEO web site for review
Brain Surgery
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Let’s Look Into Your Brain!
Today’s topics Right/Left Brain
Clip Dysfunctions
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How do the two hemispheres of the brain communicate?
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Lateralization of function of the human brain
Split Brain- although similarly located both cerebral hemispheres generally have similar functions, but. . .
There are some differences or lateralization of functions shown to exist
How did scientist figure this out???
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Roger Sperry
According to Dr.Sperry, the brain has two hemispheres with different but overlapping functions. The right and left hemispheres of the brain each specialize in distinct types of thinking processes.
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Left and Right Brain Specialization
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http://www.nobelprize.org/educational/medicine/split-brain/index.html
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How is this studied?
Electrical stimulation
PET scans
Cerebral vascular accidents (strokes), injury or lesioning Left/Right Side neglect
Split brain patients
Drugs affecting half of brain
Dichotic listening
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Michael Gazzinga
Over the course of several decades, a major focus of his research has been an extensive study of patients that have undergone split-brain surgery that have revealed lateralization of functions across the cerebral hemispheres.
Split brain Paitent
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Left Hemisphere Specialization
Speech and Language FunctionsWernicke’s AreaBroca’s AreaAngular gyrus
Contralateral representation
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Right Hemisphere Specialization
Spatial Functions (patterns (gestalten), visual configurations, color discrimination)
Musical Functions
Contralateral Representation
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The Brain
#6 Language and Speech
#7 Plasticity
#8 Visual Imaging Processing
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Hemispheric Dysfunction
Broca’s Aphasia
Example (3 mins)
Wernicke’s Aphasia
example (4 mins)
Anomic Aphasia
Global Aphasia
Developmental Dyslexia
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Plasticity
Chudler/plasticity
See Hand out
The Brain 7 mins
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Windows to the Brain
Brain Imaging Techniques See Hand Out
Investigative Assignment Web search by Courtney Denton Plano ISD
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Windows on the Brain
The Greeks
Franz Gall
Brain Damage – Phineas Gage
Lesion (ablation)
Imaging Techniques
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The Greeks
Hippocrates460-377 BCEEmotions,
thought and mental health arise from the brain
Galen130-200 CEFluids in the
brain ventricles were responsible for sensations, reasoning, judgment and memories
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57
Gall’s Contribution
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58
American Phrenology Journal
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59
Phineas Gage
A railroad construction worker in Vermont in 1848. Dynamite blew a tamper rod through his eye and out his skull. Remarkably, he survived, but was never the same. Once considerate and friendly, he was now overbearing and indecisive. Theory: executive control system in prefrontal cortex was damaged.
#25 Phineas Gage
Warren Museum Harvard Medical School Boston MA
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Lesions Cutting of brain
tissue
Ablation – destroy brain tissue
(Essentially these are the same thing)
Do we do this today?
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Some cool guys
Cajal
Golgi
Penfield
Hess
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62
Golgi’s Contribution (1872)
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63
Cajal’s Contribution: Discrete cells
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Wilder Penfield Electrode into
brain to map motor cortex
1952
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Walter Hess Electrode deeper
in brain to discover function of hypothalamus and “start-stop eating” function
1955
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Brain Imaging Techniques
The are now many, highly specific methods to see into your brain.
Assignment to follow will help you discover the techniques used today.
As an introduction. . .
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More modern approaches
EEG
CAT
MRI and fMRI
PET
MEG
SPECT
DTI
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EEG
Transmit electrical activity (brain waves)
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CAT or CT scan
Computerized axial tomography- computerized image of x-rays
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MRI
Magnetic resonance imaging – magnetic field to develop image of the brain
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fMRI
Functional MRI – detect the use of oxygen in the brain
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PET
Positron emission tomography- slightly radioactive solution injected to see metabolic activity in imaged part of the brain
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MEG
Magnetoencephalography- detect activity too brief to be detected by PET or MRI
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SPECT
Single photon emission computerized tomography- tracks cerebral blood flow as an indicator of neural activity in a specific region of the brain
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Diffusion Tensor Imaging
An MRI technique that measures the diffusion of water within a cell to yield an image of axons and neural tracts
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Investigative Assignment
Brain Imaging and web search
Courtney Denton Plano ISD
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Brain Dysfunction
http://www.ted.com/talks/jill_bolte_taylor_s_powerful_stroke_of_insight.html
Ted talks and strokes
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The Endocrine System!!!!Chemical messengers telling
the body what to do
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The Endocrine System
We rarely think about the endocrine system
However, it influences almost every cell, organ and function of our bodies
It is instrumental in regulating mood, growth and development, tissue functions, metabolism, sexual functions and reproductive processes
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The Endocrine System
Integration and control is achieved through interaction of the nervous system with the endocrine system of glands that secrete chemical messengers called hormones.
Endocrine v. exocrine systems
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Endocrine glands secrete “within” the body See remaining lecture notes
Exocrine glands secrete “outside” of the body Sweat glands Salivary glands Tear glands
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A brief introduction
The endocrine system 3 mins
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Comparison of endocrine and nervous system
Endocrine Glands
Secrete hormones directly into the blood stream
Endocrine transport may take minutes to hours
Endocrine effects are typically long lasting
BOTH interact with specific receptors on or in the target cells
Neurons (Nervous System)
Neurons transmit signals over neural networks (generally speaking)
Nervous control may take a fraction of a second to minutes
Neural effects are short lived
There is overlap between systems!!
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The foundations of the endocrine system
Glands Hormones
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Glands
A group of cells that produce and secrete chemicals
A gland selects and removes materials from the blood, processes them and secretes the finished chemical product for use somewhere in the body
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Hormones – the chemical messengers of the body
3 typesSteroidsPeptides or proteinsAmino acid derivatives
Small amounts
Rapidly degraded
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Specialized function of the endocrine glands
Pineal gland
Pituitary gland- Hypothalamus
Thyroid gland
Parathyroid gland
Adrenal gland
Pancreas
Ovaries and Testes
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Discussion topics
How about synthetic hormones?
Hormonal disorders?