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Chapter 2


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PSY 654
Benjamin Dyson

Cognitive PsychologyChapter TwoTextbookCognitive Neuroscience Neurons The Building Blocks of the Nervous System The building blocks and transmission lines of the nervous system th19 century anatomists applied special stains to the brain tissue which increased the contrast between different types of tissue within the brainoNerve neta continuous system that provides a complex pathway for conducting signals uninterrupted through the networkCajal Golgi stains oCells were individual units oNeuron doctrineidea that individual cells transmit signals in the nervous system and that these cells are not continuous with other cells as proposed in the nerve net theoryNeuron has a receiving end and a transmitting end and its role was to transmit signalsReceptorsspecialized cells that pick up information from the environment Neurons are not connected indiscriminately by form connections only to specific neurons Neural circuitswhen many neurons are connected together The Signals that Travel in Neurons Edgar Adrian oAble to record electrical signals from single sensory neurons Action Potential oTravels all the way down the axon without changing its size Making it useful for sending signals over a distance oIncreasing the stimulus intensity causes an increase in the rate of nerve firingie increasing the intensity of light presented to visual receptors in the retina causes more rapid firing of neurons in the visual system and an increased perception of brightness
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