MEASURING OUR SENSES.

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MEASURING OUR SENSES

MEASURING OUR SENSES PHYSICS + PSYCHOLOGY = Psychophysics AWESOME!!! ___________________: A field of study that draws upon physics and psychology to study the sensitivity of our senses PHYSICS + PSYCHOLOGY = AWESOME!!!

THRESHOLDS Absolute Threshold Threshold 50% ________________________: The smallest quantity of physical energy that can be reliably detected by an observer RELIABLE = Detection _____ of the time EXAMPLE: What’s the smallest line you will read correctly 50% of the time? Threshold 50%

NORMAL SENSORY ABILITIES VISION: A candle flame on a clear, dark night from _____ miles away. HEARING: A ticking watch in a perfectly quiet room from _____ feet away TASTE: A teaspoon of sugar diluted in _____ gallons of water SMELL: A drop of perfume diffused through a ____-room apartment TOUCH: Feel the wing of a bee falling on your cheek from a height of ______ 30 20 2 3 1 cm

SENSORY RESPONSES Sensory Adaptation ________________________ The reduction or disappearance of sensory responsiveness that occurs when a stimulation is unchanging or repetitious

SENSORY ADAPTATION VERY USEFUL! VERY HARMFUL! ►Feeling the watch on your wrist ► Swimming in a cold lake VERY HARMFUL! You might no longer smell a gas leak that you noticed upon first entering the kitchen.

Ted, your house smells like burnt hair!

SENSORY RESPONSES Sensory Deprivation Uhhh, hello? Anyone? _______________________ The absence of normal levels of sensory stimulation Uhhh, hello? Anyone?

STUDIES IN SENSORY DEPRIVATION MALE VOLUNTEERS Isolated from all patterned sight and sound Vision was restricted by a translucent visor Hearing was restricted by a U-shaped pillow and by background noise from an A/C unit or fan Touch was restricted by cotton gloves and cardboard cuffs Given brief restroom eating breaks BUT… Spent their entire day laying in bed, doing Nothing!

Within a few hours, many felt edgy RESULTS Within a few hours, many felt edgy Some were so disoriented, they quit the first day! Those who remained became confused, restless, and grouchy Many reported bizarre visions Example: Squadron of marching squirrels or a procession of marching eyeglasses Very few men were willing to remain in the study for more than 2 or 3 days

SENSORY RESPONSES Sensory Overload ______________________ Occurs when there is excess stimulation; leads to fatigue and mental exhaustion EXAMPLE Finals Week

SENSORY OVERLOAD Selective Attention WE CAN ONLY FOCUS ON ONE THING AT A TIME!!! _______________________ A.K.A. Cocktail Party Effect Selective Attention

What Do You Remember? What is the detection of physical energy called? There are billions of these in our bodies which carry electrical messages to the brain. What does APA stand for? The smallest quantity of physical energy that can be reliably detected is called the ____________. 5. A normal threshold for seeing candle flame on a clear, dark night is _____ miles away.

What Do You Remember? 6. Someone let off a stink bomb in the hallway. At first, the smell is horrendous but after a while you stop noticing it…what is this called? 7. Becoming overwhelmed by the amount of things on your schedule is called... 8. The interpretation of sensory info is called _______ 9. Another name for the Cocktail Party Effect. 10. Who ran the Stanford Prison Experiment?