Psychophysics

Janice picks up her gym bag only to notice that it feels heavier than before, she is not sure because she can hardly detect a chance but investigates further, and she finds that her son has added a matchbox car to her workout gear.

• just noticeable difference

• absolute threshold

• Weber's Law

Knute has told his son to go and complete his homework in his bedroom and not to use any technology, ten minutes after his son goes upstairs Knute believes that he hears the faint buzz of the television.

• just noticeable difference

• absolute threshold

• Weber's Law

Your friend hates carrying her books around school, so she has been secretly placing her things in your backpack during English class. You have not noticed when she has placed pencils or her folder in your backpack but now that she has put her AP Psychology textbook in your bag, you immediately notice a difference.

• just noticeable difference

• absolute threshold

• Weber's Law

The server has placed one sugar cube in your tea as you requested, and you can just detect a hint of sweetness.

• just noticeable difference

• absolute threshold

• Weber's Law

Had he added another sugar cube when your back was turned, you would have noticed that your tea was sweeter.

• just noticeable difference

• absolute threshold

• Weber's Law

Harold is training for the Olympics in the category of weight lifting, he does not notice when his trainer adds 10 more pounds to his 300-pound deadlift, but does notice when twenty pounds is added.

• just noticeable difference

• absolute threshold

• Weber's Law

Gustav Fechner described being able to identify the minimal change necessary for one to detect that something has changed.

• just noticeable difference

• absolute threshold

• Weber's Law

If a stimulus falls below one’s absolute threshold, it is said to be SUBLIMINAL, the minimum stimulus need to reach one’s absolute threshold is

• 10%

• 25%

• 50%

• 75%

Each morning you listen for the sound of woodpecker at your bedroom window, as you get ready for school you hear a very faint sound you instantly identify as you friend the woodpecker

• just noticeable difference

• absolute threshold

• Weber's Law