Population The whole group wed like to study that we take samplings of to study

Population the whole group wed like to study that we

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Population The whole group we’d like to study that we take samplings of to study Random sample Everyone has an equal chance of being chosen Each member of a population has an equal chance of being selected to participate Stratified sample Subgroup of population that people are taken out of to study A same drawn so that Identified subgroups in the population are represented proportionally in the sample oMethods of observation Case study Good for rare conditions LOTS of info on little people !Hard to generalize usually medical Surveys Good for things we cant experiment Answer questions about their attitudes or behaviors Lots of info from lots of people Problems !Volunteer bias !Lying Naturalistic Observe organisms in their natural environment
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Not good for cause and effect oExperimental method Good for cause and effect Seek to confirm cause and effect relationships by introducing IV and observing their effects on DV Experimental and control groups Experimental group !The group in which receives the treatment Control group !The group that doesn’t receive the treatment and everything around them is held constant IV and DV Independent variable (IV) !Something is changed in the study !Something is manipulated in order to observe its effects Dependent variable (DV) !The guess effect from the IV !The measure of an assumed effect on an IV Blind and double-blind studies Blind !Only the subject doesn’t know if they received the treatment Double-blind !Neither the subject nor the experimenter know who has received treatment Ethics oWith humans IRB Three requirements
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oConfidentiality oInformed consent they know everything before they say yes oDebrief They know the effects and stuff oWith animals Three questions that need to be answered 1. Can it be done with humans? 2. Can it cause harm to the animals? 3. Can we justify it? Chapter 2 Nervous system oNeurons A specialized cell of the nervous system that receives and transmits messages Parts and their functions Soma (body) largest part In soma, nucleus !Nucleus is the control center !Tells neuron what to do overall Axon, axon terminals !Nucleus tells the cells to fire and it fires through the axon !Axon terminal is where the neuron releases its chemical signals Myelin !Speed up everything !Not every neuron has this !Prevents interference, sends signals faster
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Dendrites !Branches that bring messages to neuron !Where the nucleus gets its info from !Gathers signals from other neurons !Grab any chemical they can around them !Afferent v. efferent Afferent !Sensory !Fingertips typing !Carry signals to cns !Transit messages from sensory receptors to the spinal cord and brain Efferent !Motor !Carry our signal from the cns !Brain sends signals to hand or feet to move !Transmit messages from the brain or spinal cord to muscles and glands Neural impulse Stages of the action potential oStart with resting potential (-70mV) with positive sodium
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  • Spring '12
  • BORIDERI

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