HCI Course: The Human Stephen Gilbert June 20, 2014 SPIRE-EIT.

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Presentation transcript:

HCI Course: The Human Stephen Gilbert June 20, 2014 SPIRE-EIT

Inputs & Outputs Vision Hearing Touch Movement

Vision

Visual Angle / Visual Acuity Spaces detectable at 30 sec – 1 min of visual arc

Brightness Luminance is physical (photometer) Brightness is a perception Measured 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 blue rare ~ 8% of males ~ 1% of females

Some Illusions

The quick brown fox jumps over the the lazy dog.

Some Illusions YouTube, esp. recent OK Go video and Videos by Brusspup

Design Ideas Reading: line lengths 2.3” – 5.2” are good Dark characters on light screen –Negative contrast gives higher luminance Motion in periphery is eye-catching

Hearing Pitch Loudness (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: Homunculus SomatosenoryMotor

Movement Hick-Hyman law – time to choose Fitts’ law – time to move Reaction Time = a + b log 2 (distance/size + 1) Selection Time = a + b log 2 N

Info Processing Model

x x PUSH- YES PUSH- YES

Stroop

BLACK RED GREEN BLACK BLUE RED BLACK GREEN BLUE 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 % Recall Average # 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

7 +/- 2 Chunks L Q R A Z J N P M Discredited

7 +/- 2 Chunks A B C I B M F B I Discredited

Mental Representations Semantic Network Frames Scripts

Semantic Network

Frames

Scripts Entry 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?