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PSYC 2410 (149)
Dan Meegan (42)
Chapter 5

Chapter Five - Psych 1100

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PSYC 2410
Dan Meegan

Chapter 5Psych 110 Synaesthesia a condition In which stimuli are experienced not only in the in the normal sensory modality but in others as well y More likely in women y Maurer and her colleague have suggested that we are all born synaesthetic The neural pathways of infants are fairly undifferentiated and lead to crossmodal perceptions y Sensory receptors must translate this information into the only language your nervous system understands the language of nerve impulsesthis is call transduction y Feature detectors break down and analyze the specific features of the stimuli y These numerous stimulus pieces are reconstructed into a neural representation that is then compared with previously stored information y In people with synesthesia there is some sort of crosswriting so that activity in one part of the brain evokes responses in another part of the brain dedicated to another sensory modality y One theory is that the pruning of neural connections that occurs in infancy has not occurred in people with synesthesia so that brain regions retain connections that are absent in most people y One theory is that with synesthesia there is a deficit in neural inhibitory processes in the brain that ordinarily keep input from one sensory modality from overflowing into other sensory areas and stimulating them y Both normal perceptual processes and synesthesia relate to one of the mysteries in cognitive neuroscience called the binding problemSensation the process by which stimuli are detected transduced into nerve impulses and sent to the brainPerception the process of organizing stimulus input and giving it meaning Sensory Processesy Certain neurons have developed into specialized sensory receptors that can transform these energy forms into the code language of nerve impulsesTransduction the conversion of one form of energy into another in sensation the process whereby the physical stimuli are translated into nerve impulsesy Appear to be more than the 5 classical sensesbalance body position y Sense of touch can be subdivided into 3 separate sense of pressure pain and temperature y The immune system also has sensory functions that allow it to detect foreign invaders and to receive stimulation from the brain y Have specialized sensors that can detect many different kinds of stimuli with considerable sensitivity
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