test 1 COPY Flashcards
Psyche
soul
Logos
to study
Wilhelm Wundt (1870s)
combines the disciplines of philosophy and physiology
Psychological Research
- Naturalistic
- observation
- Surveys
- Case Study
- Correlational
- Experimental
correlation
- a measure of association between two variables (-1 < r < +1)
- direction (positive vs. negative/inverse)
- strength
- perfect correlation (1.0)
- strong (0.6 to 0.8)
- moderately strong (0.3 to 0.5)
- no correlation (0)
- cannot tell us about causation
Correlational Research
- Establishes whether there is a relationship between two or more variables
- CANNOT INFER CAUSALITY
- Directionality problem
- Potential for a third variable (confound)
Correlational vs. Experimental Research
- Smoking is correlated with lung cancer
- High grades are correlated with successful careers
- Eating Frosted Flakes is correlated with lower cancer rates
- In Taiwan birth control use is correlated with number of household appliances
Experimental Research
- Considered the most powerful tool for determining causal relationships
- Random Assignment: ensures that every participant has an equal chance of being assigned to any of the conditions
- This minimizes the chance that a pre-existing difference between groups is the cause of the “experimental effect”
Experimental Research
- Considered the most powerful tool for determining causal relationships
- Random Assignment: ensures that every participant has an equal chance of being assigned to any of the conditions
- This minimizes the chance that a pre-existing difference between groups is the cause of the “experimental effect”
Bias in Research
- Sampling bias
- Placebo effects
- Social desirability bias
- Response sets
Experimenter bias:
- double blind procedure
Components of the Neuron
(Dendrites)
receive information from other neurons
Components of the Neuron
(cell body)
creates transmitter molecules
Components of the Neuron
(Axon)
- Myelin insulates the nerve cell, speeds up conduction of nerve messages
- Terminal buttons of the axon release transmitter
Graded Potentials
Stimulation of the nerve membrane can open ion channels in the membrane
Graded Potentials NA+
NA+ ions flowing in will depolarize the membrane (movement from -70 mV to say -60 mV
Graded Potentials K+
K+ ions flowing out of membrane will hyperpolarize the membrane (-70 mV to say -90 mV)
The Action Potential
Graded potentials:
- generated at the dendrites
-are conducted along the membrane to the axon hillock
- If summated activity at the axon hillock raises the membrane potential past threshold
- an action potential (AP) will occur
- During the AP, NA+ ions flow into the cell raising the membrane potential to +40 mV, producing the spike
- The restoration of the membrane potential to -70 mV is produced by an opening of channels to K+
- The AP is conducted along the axon toward the terminals
Neurotransmitters
- Acetylcholine (Ach)
- Monoamines:
- epinephrine and norepinephrine
- serotonin
- dopamine
- GABA
- Glutamate
Autonomic Nervous System
(two systems)
The Autonomic Nervous System (ANS) has two divisions:
- Sympathetic: Emergency system
- Parasympathetic: Vegetative functions (e.g. digestion)
- The two systems often act in opposition (as in the control of heart rate)
- Can act in concert (as in the control of sexual reflexes)
Middle View of Human Brain
(Medulla)
Controls heart rate, respiration
Midline View of Human Brain
(Cerebellum)
Coordinates smooth movements, balance, and posture
Midline View of Human Brain
(Pons)
Involved in the control of sleep
Limbic System Functions
- Septal area is involved in pleasure and in relief from pain
- Amygdala is involved in learning and recognition of fear
- Hippocampus is involved in memory
Limbic System Functions
- Septal area is involved in pleasure and in relief from pain
- Amygdala is involved in learning and recognition of fear
- Hippocampus is involved in memory