7A: Individual Influences on Behavior Flashcards
What are the two major divisions of the nervous system?
Central and Peripheral
What does the CNS include?
Brain and spinal cord
What does the PNS include?
Cranial and spinal nerves; divided into somatic (voluntary) and autonomic (involuntary) divisions
What are the divisions of the ANS?
Parasympathetic (Rest & Digest)
Sympathetic (Fight or Flight)
What are the types of neurons in the nervous system?
Sensory (Afferent)
Interneurons
Motor (Efferent)
What is the structure of the neuron?
Cell Body (Soma) Dendrites Axon Hillock Axon Myelin Sheath Synaptic Terminal Nodes of Ranvier
What are neurotransmitters?
These are what neurons use to communicate with each other
What is the function of Acetylcholine?
Associated with voluntary movement (muscle contraction) and development of memory in the hippocampus; also used for alertness
Excess: depression
Shortage: dementia
What is the function of Serotonin?
Regulates appetite, sex drive, moods and ability to sleep
Shortage: depression/anxiety disorders
What is the function of Dopamine?
Affects our ability to concentrate, pay attention, learn and move
Excess: Schizophrenia
Shortage: Parkinsons Disease
What is the function of Norepinephrine?
Involved with glucose metabolism and energy
Shortage: Depression
What is the function of γ-Aminobutyric acid (GABA)?
It is an inhibitory neurotransmitter; reduces neuronal excitability
Shortage: Anxiety Disorders
What is the function of Endorphins?
It is an inhibitory neuropeptide that is involved with pain reduction; Enkephalins also do the same
What are reflex arcs?
These utilize the ability of interneurons in the spinal cord to relay information to the source of stimuli while simultaneously routing it to the brain
Receptor -> Sensory -> Integration center -> Motor -> Effector
What structures are in the forebrain?
Thalamus Hypothalamus Basal Ganglia Limbic System Cerebral Cortex
What structures are in the midbrain?
Inferior and Superior Colliculi
What structures are in the hindbrain?
Cerebellum
Medulla Oblongata
Reticular Formation
What structures are in the brainstem?
Medulla
Pons
Midbrain
Function of Thalamus
Relay station for sensory infromation
Function of Hypothalamus
Maintain homeostasis & integrates with the endocrine system through the hypophyseal portal system that connects to the anterior pituitary
Function of Basal Ganglia
Smoothen movements and help maintain postural stability
Function of Limbic System
Controls Emotion and Memory
Function of Septal Nuclei
Involved with feelings of pleasure, pleasure-seeking behavior and addiction
Function of Amygdala
Controls fear and aggression
Function of Hippocampus
Consolidates memories and communicates with other parts of the limbic system through the fornix
Parts of the Cerebral Cortex
Frontal Lobe
Parietal Lobe
Occipital Lobe
Temporal Lobe
Function of Frontal Lobe
Controls executive function, impulse control, long-term planning, motor function and speech production
Function of Parietal Lobe
Controls sensation of touch, pressure, temperature and pain; spatial processing, spatial orientation and spatial manipulation
Function of Occipital Lobe
Controls visual processing
Function of Temporal Lobe
Controls sound processing, speech perception, memory and emotion
Which hemisphere of the brain is usually dominant for language?
The Left Hemisphere
What are some cortical functions that are lateralized?
Language, handedness
What are some methods used to study the brain?
Creating lesions, using electroencephalograms (brain waves), computerized axial tomography (3D picture), magnetic resonance imaging (detailed picture), positron emission tomography (brain activity)
What are the functions of the endocrine system?
It is utilized as a way for cells to communicate with one of another over long distances
What coordinates the endocrine system?
Hypothalamus
What is the function of the pituitary gland?
Secretes hormones and neurotransmitters for growth, reproduction and mental development
What is the function of the thyroid gland?
Regulate metabolism, energy usage and it has immune functions
What is the function of the parathyroid gland?
It is used to manage proper bone development; regulate calcium levels in blood
What is the function of the adrenal gland?
Releases adrenaline and manages energy usage
What is the function of the pineal gland?
It connects the endocrine and nervous system; it releases melatonin
What is the function of the reproductive gland (ovaries & testes)?
Produces estrogen, testosterone and progesterone
What is the function of cortisol?
Released by the adrenal cortex during stress to mediate blood glucose levels
What is the function of testosterone & estrogen?
They mediate libido and produce secondary sexual characteristics
What is the function of epinephrine & norepinephrine?
They are released by adrenal medulla and cause physiological changes associated with the sympathetic nervous system involved in HR, BP, Metabolism etc.
How does the endocrine system affect behavior?
It is involved in reproductive behaviors, sleeping patterns (wakefulness) and emotions
How do genes affect behavior?
Certain behaviors are predetermined by genetics and some personality traits are influenced by genes; manipulating genes in a species can affect their behavior characteristics
What are temperaments?
A person’s or animal’s nature, especially as it permanently affects their behaviour.
What are the three types of temperaments?
Difficult, Easy, Cautious
How does heredity influence behavior?
Parents pass their traits to their children; personality and behavior characteristics overlap
Nature vs. Nurture
It describes the contributions of genetics and environment on an individual’s trait
Family Studies (Nature vs. Nurture)
Looks at the relative frequency of a trait within a family compared to the general population
Twin Studies (Nature vs. Nurture)
Compares concordance rates between monozygotic and dizygotic twins
Adoption Studies
Compare similarities between adopted children and their adoptive parents, relative to similarities with their biological parents
Describe the value of traits/behaviors
They are adaptive and adjustable, change throughout development, culture and environment
How does the nervous system develop?
Through neurulation, which is when the notochord stimulates ectoderm to fold over creating neural tube, covered by the neural crest
What does the neural tube become?
The central nervous system
What do the neural crest cells become?
They spread out throughout the body, differentiating into many different tissues
What are the stages of embryonic development?
Fertilization -> Cleavage -> Gastrulation -> Neurulation -> Neural Crest Formation -> Organogenesis
Fertilization
The union of male and female gametes
Cleavage
Embryo called: blastula
The zygote rapidly divides into many smaller cells without an overall increase in size; it increases in mass
Blastomeres are formed, which eventually form a morula followed by a blastula which is filled with blastocoel
Gastrulation
Embryo called: gastrula
Cells of the zygote form the primary germ layers (ecto, meso and endoderm); the blastocoel is eliminated and the archenteron is formed;
Neurulation
Embryo called: Neurula
The nervous system begins to form through the creation of the neural tube
Neural Crest Formation
Form sensory cells, adrenal medulla
Organogenesis
Different body organs begin to form
What does the ectoderm differentiate into?
Skin, lens of the eye, brain and nervous system
What does the mesoderm differentiate into?
Notochord, Heart, Skeleton, Muscle, Epithelia of Organs, Reproductive Organs
What does the endoderm differentiate into?
Inner lining of digestive tract, respiratory tract, major glands such as liver, pancreas
What are primitive reflexes?
These exist in infants and should disappear with age, most served in a protective role
Rooting Reflex
Infants turn his or her head toward anything that brushes the cheek
Moro Reflex
Infant extends the arms and slowly retracts them and cries in response to a falling sensation
Babinski Reflex
The big toe is extended and the other toes fan in response to the brushing of the sole of the foot