PSY 164: Sensation and Perception

Class 4

  1. Finish Action Potential
    1. Review
    2. All-or-None Law
      1. All action potentials same size
      2. Action potential stays sames Size as travels
      3. How does the action potential happen chemically
      4. What does this mean?
    3. Saltatory Conduction
      Saltatory Conduction
    4. Refractory Periods
      1. Absolute :
        1. Sodium Channel is Open
        2. Lasts ~ 1 ms
      2. Relative :
        1. rest of action potential till after overshoot is done
        2. Lasts 1-2 msec
  2. Synapses

    found: http://web.lemoyne.edu/~hevern/psy340/lectures/psy340.03.1.synapse.html


    source unknown.
  3. Synaptic Transmission
    1. Production
    2. Storage
    3. Release
    4. Binding
    5. Removal - Destruction and Reuptake

      From "Action at the Synapse" the Psychology Place now owned by Pearson Ed. 
  4. Generating a New Action Potential
    1. Summation
      1. Spatial Summation
      2. Temporal Summation

        from: http://www.colorado.edu/kines/Class/IPHY3730/04nervephysiology.html
    2. Let us See Summation in Action
  5. The Brain
    1. General Organization
      1. The Brain is divided into four lobes
        1. Frontal
        2. Parietal
        3. Temporal
        4. Occipital
      2. The Thalamus

        Source unknown
    2. The Cortex
      1. Is the surface of the brain, about 1/4" thick
      2. Is composed of 6 layers

        Netter, Ciba Collection of Medical Illustrations   Source unknown
      3. Different parts of the cortex perform different functions, e.g.:
        1. Visual Cortex: Occipital Lobe
        2. Auditory Cortex: Temporal Lobe
        3. Somatosensory Cortex: Parietal Lobe: Postcentral Gyrus
        4. Motor Cortex: Frontal Lobe: Precentral Gyrus