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Hypothalamus Overview
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Chapter 7:6 Study Guide NERVOUS SYSTEM P179-187 Nervous System-complex, highly organized system that coordinates all the activities of the body. *The basic structural unit of the nervous system is the neuron, or nerve cell. It consists of a cell body containing:  Nucleus  Nerve fibers called dendrites (carry impulses toward the cell body)  Single nerve fiber called axon (carry impulses away from the cell body) Many axons have a lipid covering called a myelin sheath, which increases the rate of impulse transmission and insulates and maintains the axon. The axon of one neuron lies close to the dendrites of many other neurons. The spaces between them are known as synapses. Special chemicals, called neurotransmitters, located at the end of each axon allow the nerve impulses to pass from one neuron to another. Nerves are a combination of many nerve fibers located outside the brain and spinal cord. Meninges are membranes or protective lining that covers the brain and spinal cord. Afferent, or sensory, nerves carry messages from all parts of the body to the brain and spinal cord. Efferent, or motor, nerves carry messages from the brain and spinal cord to the muscles and glands. Associative, or internuncial, nerves carry both sensory and motor messages. There are two main divisions to the nervous system: 1. 2. Central nervous system: consists of the brain and spinal cord Peripheral nervous system: consists of the nerves. A separate division of the peripheral nervous system is the autonomic nervous system. This system controls involuntary body functions. *Brain-mass of nerve tissue well protected by membranes and the cranium, or skull. The main sections include:  Cerebrum-the largest and highest section of the brain. Responsible for: reasoning, thought, memory, speech, sensation, sight, smell, hearing, and voluntary body movement.  Cerebellum-section below the back of the cerebrum. Responsible for: muscle coordination, balance and posture, muscle tone.  Diencephalon-section between the cerebrum and midbrain. o Thalamus-acts as a relay center and directs sensory impulses to the cerebrum. o Hypothalamus-regulates and controls the autonomic nervous system, temperature, appetite, water balance sleep and blood vessel constriction and dilation. Also involved in emotions such as anger, fear, pleasure, pain and affection.  Midbrain-the section located below the cerebrum at the top of the brain stem. Responsible for conducting impulses between brain parts and for certain eye and auditory reflexes.  Pons-located below the midbrain and in the brain stem. Responsible for conducting messages to other parts of the brain; for certain reflex actions including chewing, tasting, and saliva production; and for assisting with respiration.  Medulla oblongata-the lowest part of the brain stem. Connects with the spinal cord and is responsible for regulating heartbeat, respiration, swallowing, coughing, and blood pressure. The spinal cord continues down from the medulla oblongata and ends at the first or second lumbar vertebrae. *The meninges are three membranes that cover and protect the brain and spinal cord. 1. 2. 3. Dura mater-thick, tough, outer layer Arachnoid membrane-delicate and web like Pia mater-closely attached to the brain and spinal cord and contains blood vessels that nourish the nerve tissue. The brain has four ventricles, hollow spaces that connect with each other and with the space under the arachnoid membrane. The ventricles are filled with a fluid called cerebrospinal fluid. This fluid circulates continually between the ventricles and through the subarachnoid space. It serves as a shock absorber to protect the brain and spinal cord. It also carries nutrients to some parts of the brain and spinal cord and helps remove metabolic products and wastes. After circulating, it is absorbed into the blood vessels of the dura mater and returned to the bloodstream through special structures called the arachnoid villi. The peripheral nervous system consists of the somatic and autonomic nervous systems. The somatic nervous system consists of 12 pairs of cranial nerves and their branches and 31 pairs of spinal nerves and their branches. Some of the cranial nerves are responsible for special senses such as sight, hearing, taste, and smell. The Autonomic nervous system is an important part of the peripheral nervous system. It helps maintain a balance in the involuntary functions of the body and allows the body to react in times of emergency. *There are two divisions to the autonomic nervous system: Sympathetic nervous system: prepares the body in times of emergencies. Prepares the body to act by increasing heart rate, respiration, and blood pressure and slowing activity in the digestive tract. This is known as the fight or flight response. Parasympathetic nervous system: After the emergency, this slows down the heart rate, decreases respirations, lowers blood pressure and increases activity in the digestive tract. Cerebral Palsy is a disturbance in voluntary muscle action and is caused by brain damage. Lack of oxygen to the brain, birth injuries, prenatal rubella, and infections can all cause cerebral palsy. Cerebrovascular Accident or CVA (stroke) occurs when the blood flow to the brain is impaired, resulting in a lack of oxygen and a destruction of brain tissue. CVA includes loss of consciousness; weakness or 1. 2. paralysis on one side of the body (hemiplegia); dizziness; dysphagia (difficulty swallowing); visual disturbances; mental confusion; aphasia (speech and language impairment); and incontinence. When a CVA occurs, immediate care within the first three hours can help prevent brain damage. Treatment with thrombolytic or “clot-busting” drugs such as TPA (tissue plasminogen activator) can dissolve the blood clot and restore blood flow to the brain. Aphasia is a speech or language impairment. There are different types. ALS is amyotrophic lateral sclerosis. Also called Lou Gehrig’s disease. This is a chronic degenerative neuromuscular disease. The cause is unknown. Carpal tunnel syndrome is a progressive, painful condition of the wrist and hand. It occurs when the median nurse is pinched or compressed. Concussions are traumatic brain injuries, usually from a blow to the head by an accident, injury or fall. The brain slides back/forward and forcefully hits against the skull. Think of it like a bruise on the brain. Encephalitis is an inflammation of the brain and is caused by a virus, bacterium, or chemical agent. Epilepsy or seizure syndrome is a brain disorder associated with abnormal electrical impulses in the neurons of the brain. Hydrocephalus is an excessive accumulation of cerebrospinal fluid in the ventricles and, in some cases, the subarachnoid space of the brain. It is usually cause by a congenital (at birth) defect, infection, or tumor that obstructs the flow of cerebrospinal fluid out of the brain. The condition is treated by the surgical implantation of a shunt (tube) between the ventricles and the veins, heart, or abdominal peritoneal cavity to provide for drainage of the excess fluid. Meningitis is an inflammation of the meninges of the brain and/or spinal cord and is caused by a bacterium, virus, fungus, or toxins such as lead and arsenic. Multiple Sclerosis (MS) is a chronic, progressive, disabling condition resulting from a degeneration of the myelin sheath in the central nervous system. Neuralgia is nerve pain. Inflammation, pressure, toxins, and other disease cause it. Paralysis usually results from a brain or spinal cord injury that destroys neurons and results in a loss of function and sensation below the level of injury. Hemiplegia is paralysis on side of the body and is caused by a tumor, injury, or CVA. Paraplegia is paralysis in the lower extremities or lower part of the body and is caused by a spinal cord injury. Quadriplegia is paralysis of t harems, legs, and body below the spinal cord injury. Parkinson’s disease is a chronic, progressive condition involving degeneration of brain cells, usually in persons over 50 years of age
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Hypothalamus
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Hypothalamus
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Final Exam Notes Motivation — the process that initiates, guides, and maintains goal-oriented behaviors Need — a requirement for survival (e.g. food, water); unmet needs motivate behavior Need hierarchy — Maslow’s model ranking human needs (physiological, safety, love/belonging, esteem, self-actualization) Drive — an internal state created by unmet needs (biological drive) Homeostasis — tendency of body systems to maintain internal stability Drive reduction — theory that motivation arises from the desire to reduce drives (i.e. satisfy needs) Arousal — state of being physiologically alert, awake, and attentive Optimal arousal — level of arousal leading to best performance (too low or too high impairs performance) Pleasure principle — Freud’s idea that behavior is driven to seek pleasure and avoid pain Incentive — external stimulus that “pulls” behavior (rewards, goals) Intrinsic motivation — performing behavior for internal satisfaction or interest Extrinsic motivation — performing behavior to earn external reward or avoid punishment Biological factors (eating) — e.g. hunger signals from hypothalamus, genetics, metabolism Learning factors (eating) — e.g. food preferences, cultural influences, classical conditioning Achievement — desire to accomplish goals, attain standards Self-efficacy — belief in one’s ability to succeed at a task Delay of gratification — ability to resist short-term temptations for long-term goals Emotion — complex reaction involving subjective experience, physiological arousal, and expressive behaviors Primary emotions — basic emotions (e.g. joy, anger, fear, disgust, surprise) Secondary emotions — more complex emotions (e.g. guilt, shame, pride) James-Lange theory — emotion results from interpreting bodily reactions (e.g. see bear → heart races → feel fear) Cannon-Bard theory — emotions and physiological reactions occur simultaneously Two-factor (Schachter-Singer) theory — emotion = physiological arousal + cognitive label Amygdala — brain region involved in processing emotions, especially fear and threat detection Emotion regulation — methods to control or influence one’s emotions Thought suppression — trying to push thoughts/feelings out of mind Rumination — repetitively focusing on negative feelings Positive reappraisal — reinterpret event in a more positive light Humor — using jokes or laughter to cope with negative emotions Distraction — shifting attention away from emotional triggers Chapter 11: Health & Well-Being Health psychology — field studying psychological influences on health, illness, and wellness Well-being — sense of physical, mental, and social flourishing Biopsychosocial model — model that health is determined by biological, psychological, and social factors Body mass index (BMI) — weight (kg) / (height (m))²; used to classify obesity / overweight Overeating factors — biological (metabolism, hormones), social (availability, norms), genetic predisposition Anorexia nervosa — eating disorder where individuals restrict food intake, fear weight gain, distorted body image Bulimia nervosa — cycle of binge eating followed by compensatory behaviors (e.g. purging, fasting, exercising) Binge-eating disorder — recurrent episodes of eating large amounts without compensatory behaviors Stress — a process by which we perceive and respond to events appraised as overwhelming Stressor — event or condition that triggers stress response Stress response — physical, emotional, and behavioral reaction to a stressor Major life stressors — big events causing substantial change (e.g. death, job loss) Daily hassles — everyday annoyances that accumulate stress (e.g. traffic, chores) General adaptation syndrome (GAS) — three-stage model of stress response GAS phases: alarm reaction → resistance → exhaustion Fight-or-flight response — physiological response to threat (sympathetic activation) Tend-and-befriend response — stress response especially in women: nurturing and social affiliation Type A behavior pattern — competitive, time-urgent, hostile personality (linked to heart disease) Type B behavior pattern — relaxed, easygoing, less competitive Coping — efforts to manage stress Primary appraisal — evaluating whether a stressor is harmful, threatening, or challenging Secondary appraisal — evaluating one’s resources to cope Emotion-focused coping — regulating emotional response to stressor Problem-focused coping — tackling the stressor directly to reduce or eliminate it Positive psychology — field focusing on strengths, well-being, and human flourishing Five ways to stay healthy — e.g. good diet, exercise, sleep, social support, stress management Chapter 12: Social Psychology Personal attributions — attributing behavior to internal traits or dispositions Situational attributions — attributing behavior to external circumstances Fundamental attribution error — tendency to overestimate personal factors and underestimate situational factors when explaining others’ behavior Actor/observer bias — tendency to attribute one’s own actions to the situation, but others’ actions to internal traits Self-fulfilling prophecy — expectation that leads you to act in ways that make it come true Stereotypes — fixed, overgeneralized beliefs about a group Prejudice — negative attitude toward a group Discrimination — negative behavior directed at a group Ingroup bias — favoring one’s own group Outgroup bias — negative attitudes toward those outside one’s group Attitudes — evaluations of people, objects, or ideas (positive/negative) Mere exposure effect — repeated exposure to something increases liking Cognitive dissonance — discomfort when beliefs, attitudes, or behavior conflict Postdecision dissonance — tension after making a choice, leading to justifying one’s decision Persuasion — process of changing attitudes Central route — persuasion via thoughtful consideration of arguments Peripheral route — persuasion via superficial cues (e.g. attractiveness, emotion) Social facilitation — improved performance in presence of others on simple tasks Social loafing — exerting less effort when working in a group Deindividuation — loss of self-awareness/inhibition in group situations Conformity — adjusting behavior or thinking to match a group standard Compliance — changing behavior in response to a direct request Obedience — following orders from an authority figure Milgram’s study — obedience experiments where participants (under instruction) delivered shocks to a “learner” Bystander intervention effect — tendency for individuals less likely to help when others are present Chapter 14: Psychological Disorders Psychopathology — study of psychological disorders; abnormal patterns of behavior, thoughts, or feelings Diathesis-stress model — view that psychological disorders develop due to genetic vulnerability + stress Biopsychosocial approach (to disorders) — disorders result from biological, psychological, and social factors DSM-5 — Diagnostic and Statistical Manual of Mental Disorders, 5th edition (standard classification of mental disorders) Specific phobia — irrational fear of specific object or situation Social anxiety disorder — intense fear of social situations or being judged Generalized anxiety disorder — chronic, uncontrollable worry about multiple domains Panic disorder — recurrent, unexpected panic attacks Obsessive-compulsive disorder (OCD) — obsessions (intrusive thoughts) and compulsions (ritualistic behaviors) Posttraumatic stress disorder (PTSD) — disorder following exposure to traumatic event, with flashbacks, avoidance, hypervigilance Major depressive disorder — persistent sadness, loss of interest, and other symptoms interfering with daily life Bipolar I disorder — periods of mania (and usually depression) Bipolar II disorder — hypomania (less severe mania) + major depressive episodes Schizophrenia — disorder characterized by delusions, hallucinations, disorganized speech, negative symptoms Positive symptoms (in schizophrenia) — delusions, hallucinations, disorganized speech Negative symptoms — flat affect, social withdrawal, lack of motivation Hallucinations — perceptual experiences without external stimuli Delusions — false beliefs held despite evidence to the contrary Disorganized speech — incoherent or illogical thought reflected in speech Disorganized behavior — inappropriate or bizarre behavior Biological risk factors (schizophrenia) — genetics, neurotransmitter abnormalities, brain structure Environmental risk factors — prenatal exposure, stress, family environment Borderline personality disorder — instability in mood, self-image, relationships, impulsivity Antisocial personality disorder (APD) — disregard for others’ rights, lack of remorse Dissociative amnesia — inability to recall important personal information (usually after trauma) Dissociative identity disorder (DID) — presence of two or more distinct identity states Autism spectrum disorder — deficits in social communication, restricted/repetitive behaviors ADHD (attention-deficit/hyperactivity disorder) — inattention, hyperactivity, impulsivity Chapter 15: Psychological Treatment Psychotherapy — therapy involving psychological techniques to treat mental disorders Psychodynamic therapy — therapy based on psychoanalytic concepts (e.g. unconscious conflicts) Humanistic therapy — focuses on growth, self-actualization, and client potential (e.g. Rogerian) Behavior therapy — uses learning principles (classical/operant conditioning) to change behavior Cognitive therapy — focuses on changing maladaptive thoughts or beliefs Cognitive-behavioral therapy (CBT) — integrates cognitive and behavioral methods Group therapy — therapy conducted with multiple participants simultaneously Family therapy — therapeutic approach focusing on family relationships Biological therapy — treatment using biological methods (e.g. medication, brain stimulation) Psychotropic medications — drugs that affect mental processes (e.g. antidepressants, antipsychotics) Electroconvulsive therapy (ECT) — inducing seizures via electrical current to treat severe depression Transcranial magnetic stimulation (TMS) — using magnetic fields to stimulate brain regions Deep brain stimulation (DBS) — surgical implantation of electrodes to stimulate brain structures Exposure (in CBT) — confronting feared stimuli directly in safe context Systematic desensitization — gradual exposure combined with relaxation Cognitive restructuring — changing negative thought patterns Exposure-response prevention — exposure without performing compulsive behavior (used for OCD) SSRIs (selective serotonin reuptake inhibitors) — class of antidepressants (e.g. Prozac, Zoloft) Treatment for depression — CBT + SSRIs often most effective Bipolar treatment — mood stabilizers (e.g"
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