Lecture 2_PSY3321

Lecture 2_PSY3321 - Physiology From the Last Class Studying...

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Unformatted text preview: Physiology From the Last Class Studying perception : What questions do the following ask? Psychophysical approach Physiological approach Constructivist approach Gestalt approach Computational approach Ecological approach From the Last Class Measuring perception : What is the Absolute threshold? Difference threshold? Provide an example of the Method of limits Method of constant stimuli Todays Questions Physiology introduction : How has the physiological approach evolved? What are neurons & how do they send information? How is the brain organized? Physiological methods : What physio methods are used to study perception? Historical Perspective Theories : Aristotle : Mental activity occurs in heart Galen : Mental activity occurs in brains ventricles Descartes : Mental activity occurs in pineal gland ventricles pineal gland Historical Perspective Theories : Willis : Different mental functions occur in different regions of the brain ( modular organization ) Mueller : Different perceptions arise from different nerves ( doctrine of specific nerve energies ) Phrenology stemmed from Willis idea of modular organization Physiology of Perception Perception Stimulus Transduction Neural firing Neural Firing Neurons : Neural Firing Multipolar neuron firing : Neural Firing Unipolar neuron firing : axon cell body nucleus dendrites cross section of skin axon terminals Neural Firing Neuron at rest : Resting potential Sodium & potassium channels are closed (to keep Na + outside & K + inside) Inside axon is more negatively charged than outside (difference ~ -70mV) Neural Firing Neuron firing : Action potential / depolarization Sodium channel opens to let Na + in Inside axon becomes positively charged Neural Firing Neuron firing : Refractory period / repolarization Sodium channel closes to prevent more Na + inflow Potassium channel opens to let K + out Inside axon return to its negatively charged state Neural Firing Propagated response : positive charge travels down the axon Time 1 Time 2 Time 3 Direction of firing axon terminal of presynaptic neuron neurotransmitter synaptic vesicle synapse dendrite membrane of postsynaptic neuron action potential neurotransmitter synapse synaptic vesicle receptor site Presynaptic neuron Postsynaptic neuron Neural Firing...
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Lecture 2_PSY3321 - Physiology From the Last Class Studying...

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