Psych 150a1 1st Edition Lecture 11 Outline of Last Lecture I. Acquiring a samplea. Representativinessb. Sampling techniquesc. Non probability samplingII. Sources of bias in survey research 9the interviewer and participant)III. CorrelationIV. Characteristics of experimentsa. Independent variableb. Dependent variablec. Experimental controlV. Protecting participants in researchVI. Using animals as research participantsVII. Ensuring that research is ethicalVIII.Outline of Current Lecture II. The nervous systema. Centra nervous systemb. Peripheral nervous systemIII. Cells of the nervous systema. The neuroni. Sensory neuronii. Motor neuroniii. InterneuronIV. Communication between neurons: neural firingV. Neurotransmittersa. Types of neurotransmittersCurrent Lecture- The nervous systemo Central nervous system= makes sense of the worldo Peripheral nervous system= keep in touch with world- Cells of the nervous system: the neurono Types of neurons: Sensory (afferent) neuron : between the receptor and the nynapseThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute. Motor (efferent) neuron: travels from dendrite down the axon and then to the muscle fiber Interneuron- Communication between neurons: neural firingo A resting neuron is negatively charged Resting potential (-70mv)o If a portion is stimulated beyond its threshold, it briefly reverses polarity Action potential Permeability changes All-or-none- Action potential- Communication between neurons: neural firingo This polarity reversal travels down the axono Resting potential is restored (refractory period)- Communication between neurons occurs at the synapseo Junction where the axon terminal and other neuron communicate Presynaptic vs. postsynaptic neurono Firing neurons release neurotransmitters that cross the synapseo Synaptic vesicles Hold the neurotransmitter Neural firing drives them to the synapse, where they release their chemicalso The neurotransmitter binds to the receptor site on the postysynaptic neurono Ion channel openo Causes change in electrical potential of postsynaptic neuron- Neurotransmitterso After crossing the synapse, unused neurotransmitter is either degraded or reuptakeno There are more than 40 types of neurotransmitters Different neurotransmitters have different effects Drugs, neural diseases often affect neurotransmitters- Types of neurotransmitterso Acetycholine= movement, learning, memory (alzheimers)o Norepinephrine= alertness and arousal, eating (depression)o Serotonin= mood, sleep, impulsivity, emotional arousal (depression, insomnia, eating disorders)o Dopamine= movement, learning, memory, pleasure (parkinsons disease, schizophrenia)o GABA= anxiety, inhibitory (sever anxiety, Huntington’s disease, epilepsy)o Endorphin= modulation of