hci course: the human stephen gilbert june 20, 2014 spire-eit
TRANSCRIPT
HCI Course: The Human
Stephen GilbertJune 20, 2014SPIRE-EIT
Inputs & Outputs
VisionHearingTouchMovement
Vision
Vision
Visual Angle / Visual Acuity
Spaces detectable at
30 sec – 1 min of visual arc
Brightness
Luminance is physical (photometer)Brightness is a perceptionMeasured in JNDs
– just noticeable difference in luminance
Higher luminance – Higher acuity– Higher flicker ( > 50 Hz, periphery)
Color
HUE
SAT.
VALUE / BRIGHTNESS
Low Blue Acuity
3%blue
Colorblindness
Protanopia – no red
Deuteranopia – no green
Tritanopia – no bluerare
~ 8% of males~ 1% of females
Some Illusions
Some Illusions
Some Illusions
Some Illusions
The quick brownfox jumps over
the the lazy dog.
Some Illusions
http://persci.mit.edu/gallery
YouTube, esp. recent OK Go videoandVideos by Brusspup
Design Ideas
Reading: line lengths 2.3” – 5.2” are goodDark characters on light screen
– Negative contrast gives higher luminance
Motion in periphery is eye-catching
Hearing
PitchLoudness (percept of amplitude)Timbre
Cocktail party effect
Touch
Thermoreceptors (heat /cold)Nociceptors (pressure & pain)Mechanoreceptors
– Rapidly adapting (poke)– Slowly adapting (hold)
Kinesthesis
Try:Two-point Discrimination Threshold
Touch: HomunculusSomatosenory Motor
Movement
Hick-Hyman law – time to choose
Fitts’ law – time to move
Reaction Time = a + b log2(distance/size + 1)
Selection Time = a + b log2N
Info Processing Model
x
x
PUSH-YES
PUSH-YES
Stroop
BLACK
RED
GREEN
BLACK
BLUE
RED
BLACK
GREEN
BLUE
RED
RED
BLACK
BLUE
GREEN
RED
BLUE
RED
BLACK
GREEN
BLACK
Memory Demo
#
Dog
Umbrella
Hat
iPhone
Shoelace
Justice
Lawnmower
Hamster
Contract
Eggs
Book
Accordion
Javelin
Zebra
Bat
Peg
#
Memory Demo 2
#
KEF
LAK
NEL
VEK
NER
LON
NEM
BEB
SAR
FIF
#
Expected Results
Word Position
% RecallAverage # recalled
words = 8
Chess
Who is winning?
Chess
Who is winning?How do you know?
Chess
Who is winning?How do you know?What do you remember?
Experts vs. Amateurs
Memory
Memory
7 +/- 2
Chunks
L Q R A Z J N P M
Discre
dite
d
7 +/- 2
Chunks
A B C I B M F B I
Discre
dite
d
Mental Representations
Semantic NetworkFramesScripts
Semantic Network
Frames
ScriptsEntry conditions• dog ill• vet open• owner has money
Props• exam table• medicine• instruments
Roles• vet examines• owner brings dog
Scenes• arrive at reception• wait in room• examination• pay
We are not logical…
Reasoning ala Wason
Fact: – All cards have letter on one side and number on the other
Rule: – If there’s a vowel on one side, there’s an odd number on the
other side.Question:
– Which card(s) do you turn over to verify the rule?
Reasoning (2)
Fact: – All cards represent people - the person’s drink is on one side, age
is on the other.
Rule: – If the person is drinking alcohol, he or she must be over 21
Question: – Which card(s) do you turn over to verify the rule?