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Chapter 4

PSY105 - Chapter 4

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PSY 105
Kristin Vickers

Chapter 4 sensation and perception Synesthesiathe perceptual experience of one sense that is brought about by another sense psychological and neurobiological realityPage 105Brain regions for different sensory modalities crossactivate each other Sensationthe act of using our sensory systems to detect environmental stimuliOnce acquired sensory information must be interpreted in the context of past and present sensory stimuli this process involves recognition and identification called perception Perceptionrecognizing and identifying sensory stimulus Common features of sensation and perception Sensory receptor cellsSpecialized cells that convert a specific form of environmental stimuli into neural impulses the form of communication used in our brains and nervous system Sensory transductionthe process of converting a specific form of sensory data into a neural impulse that our brain can read Thresholds Testing the limitsSensory receptors can be activated by very weak stimuli A stimuli must reach a certain level of intensity before it can be detected because the conversion of physical stimuli into neural impulses only occurs when the stimuli reach this level or threshold Absolute thresholdsis the minimal stimulus necessary for detection by an individual Smallest amount of a stimulus that one can detect For example what is the dimmest light you can seeoThis is the difference between sensing and not sensingDifference threshold or just noticeable different the minimal difference between two stimuli necessary for detection of a difference between the two If you are listening to the radio how much do you have to turn the radio up before you notice that it is louder This amount of JND depends on how loud the radio is in the first place Webers law the just noticeable difference of a stimulus is a constant proportion despite variations in intensity The stronger the stimulus the larger the change will need to be in order for this change in stimulus intensity to be notice oIf the radio is already really loud it will take more much of an increase in volume for you to notice it than if the radio is playing very quietly Sensory Transduction converts environmental stimuli into neural activity
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