Human Interaction

How do people get information?

• Vision– 55MB/sec

• Audio– 64 KB/sec

• Touch– 400 B/sec

• Taste– Lower

How do people express information?

• Audio• Speech• Muscle movement– Dexterity

• Muscle Memory

Vision

Lens

Iris

Retina

Iris

Retina

Iris

Retina – 64 levels6 bits

Macula/Fovea

Periphery

Cones(color)

Rods (gray)

Cones(Red 64%Green 33%Blue 3%)

Rods (gray)

20 Rods / 1 Cone

Cones(Red 64%Green 33%Blue 3%)

Rods (gray)

20 Rods / 1 Cone

Saccade = 200 msecs5 / sec

Nature of the Macula

• Get a section of text

• Focus on one word

• Try to read surrounding words – WITHOUT MOVING YOUR EYES

Periphery/Macula

• Macula– Careful close study– Very slow

• Small window• 5 times / second

– Color• Periphery– Gray and blurry– Fast targeting

• If you must find things by reading and study– Macula / Saccade– Very Slow

• If you can find things with the periphery– Gray, Blurry– Very Fast

Lens

Iris

Retina

Macula/Fovea

Periphery

Buy play tickets (tasks)

1. What shows are playing?

2. What shows are available near where I live?

3. What do they cost?

3D Perception

• Occlusion

• Retinal Disparity

• Kinetic Depth effect

Audio

• Human hearing– 20Hz to 18Khz

• Best hearing– 1Khz to 5Khz

• Speech– 500 Hz to 3Khz

Why use audio?

• Attention– Eyes free

• Form factor

• Energy

• Express what you cannot currently see

Touch/Tactile• Vibration and skin deformation• Hairy skin

– Vibration sensors at the base of each hair• Glabrous skin

– No hair– Ridges with vibration sensors

• Vibration up to 400 Hz– 2mm spatial resolution on fingers

• Temperature– Heat dissipation

• Pain

Human Expression

• Audio• Keyboard• Pointing• Object movement

Audio

• Speech– 125-150 Words per minute– Reference the unseen– Association with shared experience– Ambiguity– Recognition accuracy– Privacy

• Non speech

Keyboard

• 50-70 Words per minute

• Ideographic Languages

Pointing

• Human movement– Muscle size / body part mass– Speed of movement– Fatigue