PSY 30440 Study Guide - Midterm Guide: Orbitofrontal Cortex, Olfactory Bulb, Primary Olfactory Cortex

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5 Dec 2017
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Exam 3 Study Guide
Chapter 14 Notes:
Olfaction =
o based on over 350 different receptor types
each sensitive to only one type of stimulus
Odorant molecules with similar molecule structures can smell VERY DIFFERENT, and
odorants with very different structures can smell almost the SAME
Perceived intensity of an odor increases as the concentration of odorant molecules
increases
Detection Threshold:
o strength of an odorant’s just-detectable concentration that is necessary for
detection
Absolute Threshold:
o absolute odor detection threshold and odor recognition threshold
Source, distance, area, and context =
o affect concentration of odors
Odors = play key role in sensing flavors
o if impaired olfactory, then impaired taste identification
ORNs:
o olfactory receptor neurons
transduce odorant molecules into neural signals
Olfactory Epithelium:
o patch of tissue in the upper reaches of each nasal cavity
contains ORNs and is covered by olfactory mucus
o Transduction of odorant molecules happens here
Orthonasal Pathway:
o odor molecules in outside air enter nasal cavities through this pathway
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