PSY 401 1st Edition Lecture 18 Outline of Last Lecture I. Early Neuroscience: Brain Localizationa. Fritsch and Hitzigi. Stimulation of motor cortexii. Contralateral brain-body relationship II. Early Neuroscience: Layout of the Nervous Systema. Camillo Golgi (1843-1926)i. Nerve cell Stainingii. Reticular Theoryb. Santiago Ramon y Cajal (1852-1934)i. Neuron TheoryOutline of Current Lecture I. Early Neuroscience: Layout of the Nervous Systema. Charles Scott Sherrington i. “Integrative Action of the Nervous System” (1906)ii. Evidence for neuron theoryiii. Speed of neural impulseiv. Proved neuron theory beyond a doubtv. Coined “synapse”, etc. II. Towards the Formal Founding and Structuralism: Psychophysicsa. Psychophysicsb. Gustav Theodor Fechner (1801-1887)i. Afterimagesii. JNDCurrent Lecture III. Early Neuroscience: Layout of the Nervous Systema. Charles Scott Sherrington i. “Integrative Action of the Nervous System” (1906)ii. Evidence for neuron theory1. 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.iii. Speed of neural impulse1. 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 doubtv. Coined “synapse”, etc. II. Towards the Formal Founding and Structuralism: Psychophysicsa. 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 sun2. 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
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