SENSATION & PERCEPTION. CHAPTERS 4 & 5 AP PSYCHOLOGY. SENSATION. How do we take in information?. A sense is a system that translates information from outside the nervous system into neural activity. Messages from senses are called sensations
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CHAPTERS 4 & 5
CODING - translation of the physical properties of a stimulus into a pattern of neural activity that specifically identifies those physical properties.
Doctrine of Specific Nerve Energies - stimulation of a particular sensory nerve provides codes for that one sense, no matter how the stimulation takes place
Temporal Code - involves changes in the timing of the neurons firing. Ex: A bright light will cause some neurons in the visual system to fire faster than a dim light.
Spatial Code - the location of the firing neurons provides information about the stimulus (tells us where the sensation is coming from).
Sound Waves 1
Sound Waves 2
Figure 4.4: The Cochlea
(bright colors, loud sounds)
Short wavelength=high frequency
(bluish colors, high-pitched sounds)
Long wavelength=low frequency
(reddish colors, low-pitched sounds)
(dull colors, soft sounds)Physical Properties of Light Waves
The cell whose receptive field includes the space at the intersection has more whiteness shining on its inhibitory surround than the cell whose receptive field is just to the right of the intersection. The output of the intersection cell will be lower than that of the one on the right, creating the impression of a shadow.
Women and young adults
have best sense of smell
10-19 20-29 30-39 40-49 50-59 60-69 70-79 80-89 90-99
Age GroupAge, Sex and Sense of Smell
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