5-100 - Chapter 5 sensation and perception 1 2 perception...

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Chapter 5, sensation and perception: 1. perception often based on previous experience. 2. our perception of the world is not a camera. We sense, we guess, sometimes get the details wrong. Stimuli must be coded to be understood by the brain: Sensory coding: sensory organs’ translation of stimuli to neural impulses. Coarse coding: sensory qualities are coded by only a few different types of receptors. Psychophysics relates stimulus to response: Psychophysics, a subfield that examines our psychological experiences of physical stimuli. How much physical energy is required for our sense organs to detect a stimulus. Absolute threshold: minimum intensity of stimulation that must occur before one experience a sensation. E.g.: touch, minimum stimulus, a fly’s wing falling on your check from one cm away. Difference threshold: just noticeable difference between two stimuli- the minimum amount of change required to detect a difference. Minimum change in volume in tv so that you notice that the show has changed to commercial. Weber’s Law: the just noticeable difference between two stimuli is based on a proportion of the original stimulus rather than on a fixed amount of difference. Signal detection theory: detecting a stimulus requires making a judgment about its presence or absence. Response bias: a participant’s tendency to report detecting the signal in an ambiguous trial. Basic sensory processes Taste: taste relies on the sense of smell. Taste experience occurs in the brain. Individual food preferences, culture preferences (begin in the womb). Smell: ordor- olfactory receptors- olfactory epithelium- olfactory bulb- olfactory nerve- cortex and amygdale- perception.
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