Sensation And Perception

Front 1

Nature of sensation

Back 1

Absolute thresholds- the least amount of energy that can be detected as a stimulation 50% of the time.Adaptation- an adjustment of the senses to the level of stimulation they are receiving

Difference thresholds- are just noticeable difference is the smallest change in stimulation that can be detected 50% of the time.

Terminal threshold- the level beyond a stimuli can no longer be detected.

Front 2

What are cones and rods responsible for?

Back 2

Rods- are chiefly responsible for night vision, respond to varying degrees of light n dark but not to colour.

Cones-respond to light and dark as well as to colour and if operate mainly in day time. Only cones are present in the fovia.

Front 3

What is addictive colour mixing?

Back 3

Is the process of mixing only a few lights of different wave length to create many new colours.

Front 4

What is subtractive colour mixing?

Back 4

This refers to mixing a few pigments to come up with a whole palette of new colour.

Front 5

Explain the theories of colour vision.

Back 5

triometric colour vision

It holds that the eye contains three types of colour receptors that are most responsive to either red,green or blue light.

Opponent process theory

Maintains that receptor cells are specialized to respond to either member of the three basic colour pairs: red/green,yellow/blue and black/white.

Front 6

What are triichomats, dichromats and monochromats?

Back 6

Trichromats- ppl with normal colour vision

Dichromats- are ppl who are blind to either red/green or yellow/blue

Monochromats- ppl who are totally colour blind.

Front 7

What ate sounds?

Back 7

Are psychological experiences created by the brain in response to stimulation.

Front 8

What are the physical stimulation for hearing?

Back 8

Sound waves- produce vibration in the eardrum.

Frequency- number of cycles o'er second in a wave expressed in a unit called HUTS.

Frequency- is the primary determinant of pitch (how high or low the time seems to be)

Alpitude- is the magnitude of a wave it largely determinds the loudness of a sound ,loudness is measured in decibals.

Front 9

Explain hearing.

Back 9

-Hearing begins when sound waves strike the eardrum and causes it to vibrate. -

This vibration in turn makes three bones in the middle ear: the hammer, the anvil n the stirrup. -

-This vibrations are magnified in the passage through the middle ear via the oval window( a membrane attached to the stirrup)

- in the inner ear the vibrations caused the fluids inside the cochlea to vibrate pushing the basilar membrane and the origin of corti up and down.

- inside the organ of corti are tiny hair cells that act as a sensory receptor for hearing.

- stimulation of these receptors produces audity signals that are transmitted to the brain through the auditory nerves.

- the brain pools the information from thousand of these cells to create the perception of cells.

Front 10

What is the basic process?

Back 10

In all sensory processes energy stimulates a receptor cells in one of those sense organs(eyes,eyes,tongue, nose,skin) the receptor cells converts that energy into a neural signal,which is further coded as it travels along sensory nerves.by the time it reaches the brain,the message is quite precise.

Front 11

What is psycho physics?

Back 11

Comparing events with our psychological experience from them.scent,song etc.

Front 12

What is processing?

Back 12

The sensory organs contain receptors that receives and process sensory information from the environment.

Front 13

What re the types of processes?

Back 13

Sensory transduction- it converts sensory stimuli into neural impulses.

- label lines- the way in which the brain interprets the type of sensory information from its neuron origin in the body and its destination in the brain,

Front 14

What is sensory perception?

Back 14

It refers to a response to an unknown event not presented to any known source.it includes clairvoyance, telepathy and precognition.

Front 15

What is clairvoyance, telepathy and pre cognition?

Back 15

*Clairvoyance- awareness of an unknown object or event.

* telepathy- knowledge of someone else thoughts or feelings.

* pre- cognition- pre knowledge of future events.

Front 16

What is sight?

Back 16

The faculty to see.

Front 17

How do we see?

Back 17

- light passes through the cornea.

- the cornea bends or refracts this incoming light

- the iris regulates the size of the pupil

- the lens further focuses light or an image onto the retina.

-the retina contains photoreceptors that converts light into electric signals.

- these electric signals are processed further and then travel from the retina of the eye to the brain through the optic nerve.

- we see with our brains our eyes collect visual information and begins this complex process.