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Chapter

TASTE.docx


Department
Neuroscience
Course Code
NROC64H3
Professor
Niemier

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TASTE
Olfaction and taste are similar because they both are chemical detecting systemsbut taste serves the
most specific funcn of nay senses; discerning which chemicals we need to ingest coz they are nutritious
and which to be spit out b/c they are poisonous.
Nature has equipped us to be passionate about food because that passion holds the ley to our survival!
Taste vs Flavor
Food molecules are almost always perceived by both the olf system and teh gustatory system.
When we chew and swallow food, other molecules are released into the air inside our mouths and
forced yp behind the palate into the nasal cavity, where they contact the olf epithelium and stimulate
our olf receptors.
Retronasal olfactory sensation(ROS)
-the sensation of odor that is perceived when chewing and swallowing forces an odorant up in the
mouth behind the palate in to the nasal cavity.such odor sensations are percievd to be coming from the
mouth
Flavour: the combo fo true taste and ROS.
Our sense of spatial orientation is based on three diff modalities: angular motion, linear motion and tilt.
They are called diff modalities b/c they rely on diff receptors and dif stimulation energies.
The 3 diff stimulation energies are; gravity, linear acc and angular acc.
The force of gravity is transduced by otolith organs
Otolith organs also sense linear acc, makes contribution to linear motion
Semicircular canals sense angular acc contributing to angular motion.
The sensitivity of vestibular organs to acceleration.demonstrates that the vestibular system is sensitive
to changes in motion.constant motion doesnot result in vestibular signals
Each of three spatial orientation modalities includes two qualities: amplitude and direction.
DIRECTION
- Corrdiante system
- Head centered, moves with the head
- X-AXIS points fwd
- Y-AXIS points out the left ear
- Z-axis points out the top of the head.
Three types of direction for head rotation
- Roll-rotation around x-axis
- Pitch - rotation around Y axis
- Yaw- rotation round z-axis
- Always defined with respect to the head.
Whenever the head is aligned with the gravity, the head can have a roll, pitch or yaw angular velocity
without roll, pitch or yaw with respect to gravity
Three types of direction for linear motion:
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