Warm Up: “Pepsi Challenge”

Which do you like bettter?

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Taste

flavor

food

papillae

Taste buds

chemical messages

smellflavor

salivatongue

Taste

• Sweet, sour, salty and bitter–Umami

• Taste buds–Chemical sense

• Age and taste

The Tongue

We now know that the tongue is not ordered as “neatly” as this

TasteSensory Interaction

• Sensory interaction• Interaction of smell and taste

–McGurk Effect• Interaction of other senses

WARM-UP:

How does smell work?

Smell

• Olfaction–Chemical sense–Odor molecules–Olfactory bulb–Olfactory nerve

Olfaction• Sense of Smell• Chemical Sense• We can distinguish 10,000 scents• 40-50 molecules of a chemical allow us to recognize a smell• Particles are absorbed into mucus covering receptor cells

lining the nasal passages. This initiates smell• Each nostril has 30,000,000 olfactory receptor cells found in

the olfactory epithelium• No classification system has been agreed on• There is a strong connection between smell and memory

because they are processed in the same area of the brain.

Smell

Receptor cells inolfactory membrane

Nasal passage

Olfactorybulb

Olfactorynerve

Smell (olfaction)

Read smell article…

Smell and age

Pheremones

• Powerful chemicals released by our bodies and detected by smell receptors

• Can act as a means of communication between animals

• Can influence physiological behavior• Debate over the extent to which humans use

them (animals rely on them heavily)

http://www.google.com/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=mTeHDgzUlxSE-M&tbnid=eBRXDmrzL0lroM:&ved=0CAUQjRw&url=http://www.brainfevercomix.com/pheromones-gone-wild/&ei=eYpyUoT9E9DirAfcq4DgBw&psig=AFQjCNGO5tdqiVHisy5Cgh3HHcvU6K9efA&ust=1383324601624841

Other connections to smell:

• “branding” in stores• Aromatherapy• Air fresheners• Effect of smell on other senses

Short Video

• Taste and Smell review and intro to touch