PSY 401 1st Edition Lecture 18 Outline of Last Lecture I II Early Neuroscience Brain Localization a Fritsch and Hitzig i Stimulation of motor cortex ii Contralateral brain body relationship Early Neuroscience Layout of the Nervous System a Camillo Golgi 1843 1926 i Nerve cell Staining ii Reticular Theory b Santiago Ramon y Cajal 1852 1934 i Neuron Theory Outline of Current Lecture I II Early Neuroscience Layout of the Nervous System a Charles Scott Sherrington i Integrative Action of the Nervous System 1906 ii Evidence for neuron theory iii Speed of neural impulse iv Proved neuron theory beyond a doubt v Coined synapse etc Towards the Formal Founding and Structuralism Psychophysics a Psychophysics b Gustav Theodor Fechner 1801 1887 i Afterimages ii JND Current Lecture III Early Neuroscience Layout of the Nervous System a Charles Scott Sherrington i Integrative Action of the Nervous System 1906 ii Evidence for neuron theory 1 Damage from lesions dogs a How diffuse damage is b Found damage was localized because neurons are not linked together damage does not unravel entire system These 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 II iii Speed of neural impulse 1 Helmoholtz s device see how fast impulse traveled 50 150 meters per second a Consistent with neuron theory because it takes time to go through the synapses slower than reticular theory iv Proved neuron theory beyond a doubt v Coined synapse etc Towards the Formal Founding and Structuralism Psychophysics a Psychophysics the relationship between physical properties of stimuli and our psychological impression of those stimuli b Gustav Theodor Fechner 1801 1887 i Afterimages look at stimulus then look at a blank screen still see the remnant of the image 1 Fechner studied this by looking at the sun 2 Got sick because looked at sun ii JND Just noticeable differences thresholds 1 JND minimum change needed to perceived change 2 Today companies try to compress audio files see how much info they can remove before people notice the difference JND
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