Perception - Key Concepts

Sensation - The physical process of collecting data from the environment via the senses

Perception - The cognitive process of interpreting data once it has been senses

When there is a mismatch between sensation and preception, you experience an illusion.

Illusion  - The effect of misinterpreting data

CONSTANCES

Shape constancy

• The ability to perceive the shape of an object as constant even if it appears to change through movement eg- bending a book

Colour constancy 

• The ability to perceive the colour of an object as constant even if it appears to change with changes in lighting eg- a white top in a dark room 

TYPES OF ILLUSIONS

The Ponzo Illusion is a geometric illustion, as both of the yellow lines are the same length, but the bottom one appears shorter

The Necker Cube is an ambiguous figure as it can be seen in more than one way depending on which 'x' you look at 

The Kanzia Triangle is a fictions illusion as you can see a white triangle which not actually there

DEPTH CUES

Texture gradient

• When the further away something is, the smoother the texture seems

Linear perspective

• When things seem to converge at a distant point

Height in the plane

• If the object is higher than the horizontal halfway line, it seems further away

Relative size

• When bigger objects appear closer and smaller objects seem further away

Superimpositon

• When one image blocks another, the full object seems closer