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Transduction
Translation of stimuli into neural impulses - these impulses first travel to the thalamus, then onto different cortices
Sensory adaptation
Decreasing responsiveness to stimuli due to constant stimulation
Sensory Habituation
Our perception of sensations is partially due to how focused we are on them
Cocktail Party Phenomenon
The ability to focus one’s attention on a particular stimulus while filtering out a range of other stimuli.
Process of vision in the eye (4 steps)
Cones
Activated by colour (concentrated towards the centre of the retina)
Rods
Respond to black and white (outnumber cones and are distributed throughout the retina)
Fovea
An indentation at the centre of the retina that contains the highest concentration of cones
Ganglion cells
If enough bipolar cells fire, the next layer, ganglion cells, are activated.
Blind spot
The spot where the optic nerve leaves the retina and has no rods or cones
Optic chiasm
Spot where the nerves cross each other
David Hubel and Torsten Wiesel
Discovered that groups of neurons in the visual cortex respond to different types of visual images (feature detectors for vertical lines, curves, motion, etc.)
Trichromatic theory
3 types of cones in the retina: cones that detect blue, red, and green
Opponent-process theory
Sensory receptors arranged in the retina come in pairs (red/green, blue/yellow, black/white)
Afterimages
Colour blindness
Dichromatic: cannot see either red/green or blue/yellow shades
Monochromatic: can only see shades of grey
The 3 ossicles
The eardrum connects with the hammer (malleus), which connects to the anvil (incus), which connects to the stirrup (stapes)
Process of hearing
Sound waves are collected in your outer ear and travel down the ear canal until they reach the eardrum (tympanic membrane)
Place theory
Hair cells in the cochlea respond to different frequencies of sound based on where they are located in the cochlea
Frequency theory
Conduction deafness
Occurs when something goes wrong with the system of conducting the sound to the cochlea (in the ear canal, eardrum, hammer/anvil/stirrup, or oval window)
Nerve (sensorineural) deafness
Occurs when the hairs in the cochlea are damaged, usually by loud noise
Gate-control theory
Vestibular sense
Tells us how our body is oriented in space
Kinaesthetic sense
Absolute threshold
The smallest amount of stimulus we can detect
Subliminal
Used to describe stimuli below our absolute threshold
Different threshold (just-noticeable diference)
The smallest amount of change needed in a stimulus before we detect a change.
Weber’s law
Computes the just-noticeable difference threshold
Signal detection theory
Investigates the effects of the distractions and interference we experience while perceiving the world.
Top-Down Processing
We perceive by filling in gaps in what we sense. It occurs when you use your background knowledge to fill in gaps in what you perceive.
Schemata
Mental representations of how we expect the world to be based on our experience.
Perceptual set
Predisposition to perceiving something in a certain way (e.g. backmasking)
Bottom-up processing
Stroboscopic effect
Images in a series of still pictures presented at a certain speed will appear to be moving.
Phi phenomenon
A series of lightbulbs turned on and off at a particular rate will appear to be one moving light.
Autokinetic effect
If a spot of light is projected steadily onto the same place on a wall of an otherwise dark room and people are asked to stare at it, they will report seeing it move.
Eleanor Gibson
Used the visual cliff experiment to determine when human infants can perceive depth