Transcript Sensation and Percetion - Webster Elementary School

Intro video

Term Quiz 1-26 Tuesday 18th
27-people Friday 21st

NEED A SCARF ON FRIDAY

I FOUND GUM UNDER A TABLE…



Absolute Threshold – 50%
of the time
Difference Threshold/JND
Signal Detection Theory
• Soldiers on Watch
•Parents with new born
•Remember the hearing
test in elementary school?
Weber’s Law
Must increase/decrease by a
proportion/percentage –
McDonald’s sweet tea example
Absolute/Difference/Weber's Video




Most common with smell (RAS)
Occurs in the brain
Smell of your house, pool water
Neural or sense receptors “fire” less due to
unchanging stimuli.

Similar to Sensory Adaptation but we can “re feel, re smell,
re hear, etc.” the stimulus
Clothes on skin, HVAC system
Things become boring…new toy, food, video games, etc.

If you stop being ABLE to sense it – Sensory Adaptation





Your brain actually stops firing neurons
If you stop PAYING ATTENTION to it – Habituation
Test Yourself – For question 5 please answer if it is Sensory
Adaptation or Habituation


Is it true???
Absolute threshold




Positive pics vs. negative pics
Chinese Characters
Can’t name object but can pick out of a group
of 20 things
HOWEVER…




No manipulation
Probably forgotten
Placebo effect
CBC example
Darren Brown




Telepathy
Clairvoyance
Precognition
Psycho kinesis

Pupil – Black part


Lens – focuses light on retina







Dilates in fear, attraction
(sympathetic nervous system)
Happens in a process called
accommodation
Iris – Muscle (color part of
eye)
Retina – light sensitive
surface
Fovea – Visual acuity
Optic nerve – no
photoreceptors (blind spot)
Rods – black and white
Cones – color
McGurk Effect

Let’s find the blind spot
If you are
nearsighted you
can see up close
but not far
away. Far
sighted is the
opposite.
Awareness Test
Who Done It
Pupils and attraction
Bio packet Brain article #10


Wavelength – distance of peaks – determines
hue
Amplitude – height – determines intensity or
brightness
Sun high in
the sky
Clifford the
big RED dog
Smurfs
Grass on
the ground
Let’s
test our
balance
How old are your ears?

Frequency – pitch (# of wavelengths)




Pitch is a tone’s highness/lowness
Amplitude – Volume (height of waves)
Purity – Timbre
Hertz – 3 waves per. Sec


Humans – 20-20,000 Hz
Dogs – 50-60,000 Hz



Which hairs vibrate on the basilar membrane
High pitch – near oval window/low pitch
further down
Works well for high pitched sounds – low pitch
poorly explained


Rate of neural impulses
The slower it vibrates the lower the pitch

Frequencies from 400 Hz to 4,000 Hz

Combines the two theories

Conduction Hearing Loss



Damage to outer or middle ear
Hearing aids amplify the sound
Nerve hearing impairments

Damage to inner ear (hairs)




Chemicals to the olfactory nerve
Taste
Memory
Pheromones




Sweet, sour, salty, bitter, umami
Flavor – odor, texture, taste
Bitter – BAD
Cravings


Pressure, Temperature, Pain
It is a primal need (will discuss again with
motivation and emotion)


Substance P
In the spinal cord

Grey's Anatomy - Dr. Robbin's



Upright without
visual information
Remember spinning
around?
Caused by fluid in the
semicircular canals

Knowing where your
body parts are
without being able to
see them

Remind messages


Quick Quiz – What sense is this?
Color changing card trick

Motion After Image

Backmasking

Cocktail Party Effect
Change Blindness
Change Deafness
Choice/Inattentional blindness
Dichotic Listening

4 questions in packet




Perceptual Set expectation
figure ground dance