Appendix of "Tactile Echoes: Wearable System to Augment Tactile Object Perception"

1. "All Word list": Result of Experiment 1

- In haptic and sound condition

bouncy, deep, echo, short, hard, light, heavy, stiff, tap, resonant, rumble, thick, drum, rubbery, rumbling, shallow, band, consistent, fast, rubber, small, solid, wobbly, beep, buzz, drumming, loose, metal, plastic, rigid, thump, water, wood, big, bubble, dead, feedback, glass, hollow, liquid, little, rolling, rough, balloon, beeping, bell, drop, echoing, empty, firm, hit, jelly, large, far, floorboards, squishy, submarine, abnormal, alien, ball, banjo, bog, bottle, drum-hit, earthy, electric, end, fluid, fork, fun, gritty, guitar, pitch, pounce, punch, quiet, rapid, rattle, realistic, scattered, shaky, tuning, tunnel, twanging, underwater, unpleasant, unstable, wobble, warbly, wavey, wavy, weaker, soft, spring, thud, wobbling, under, vibration, wooden, muted, organic, medium, metallic, odd, padded, reverberate, springy, strange, string, thin, tub, twang, bow, bowl, braud, brittle, bump, bumpy, button, cartoonish, corridor, declines, deep, sea, huge, hum, inconsistent, jello, jump, kettle, knock, long, marble, matches, muffled, sharp, sheet, ship, silly, size, space, staticky, stick, strip, table, weird, wiggle, wiggly, delayed, dense, dirty, distant, dropping, oscillating, tight, tinny, trampoling, tube, tubular, ping

- In only haptic condition

agressive, beat, bloop, coursing, decline, delayed, down, dull, lamp, landing, long, low, momentum, muted, post, prolonged, pulse, quiet, slipping, smooth, springing, sticky, strength, strokem sudden, sustained, tapping, taught, thumping, top, weak, shaking, shaky, slapping, jolt, knuckle, wiggly, jumping, quick, responsive, sharp, shock, stroking, subtle, thud, tremble, twanging, wiggle, firm, force, forceful, gristley, gritty, grumbley, humming, immediate, increasing, jiggle, rapid, repeated, resonant, reverb, reverberation, rough, rubber-ball, shake, thin, thumps, thunder, thwack tickle, tickles, trembling, twang, weird, aftershock, ball, band, constant, drop, electric, followed, gentle, grumbling, consistent, button, click, delayed, immediate, lifting, press, rattle, thump, fuzzy, small, solid, steady, tap, purring, rubber, rumble, vibrate, heavy, rubbery, strong, medium, light, rumbling, soft, spring, fast, hollow, echo, hard, buzz, short, bouncy

2. "Voting results": Result of Experiment 2

- In haptic and sound condition

Number of selection Slected rate (Number of selection/number of trial) Words
16 45.7 % bouncy
12 34.3 % deep, echo
11 31.4 % short
10 28.6 % hard, light
9 25.7 % heavy
8 22.9 % stiff, tap
7 20 % resonant, rumble, thick
6 17.1 % drum, rubbery, rumbling, shallow
5 14.3 % band, consistent, fast, rubber, small, solid, wobbly
4 11.4 % beep, buzz, drumming, loose, metal, plastic, rigid, thump, water, wood
3 8.6 % big, bubble, dead, feedback, glass, hollow, liquid, little, rolling, rough
2 5.7 % balloon, beeping, bell, drop, echoing, empty, firm, hit, jelly, large
1 2.9 % baloon, far, floorboards, squishy, submarine, abnormal, alien, ball, banjo, bog, bottle, drum-hit, earthy, electric, end, fluid, fork, fun, gritty, guitar, pitch, pounce, punch, quiet, rapid, rattle, realistic, scattered, shaky, tuning, tunnel, twanging, underwater, unpleasant, unstable, wobble, warbly, wavey, wavy, weaker, soft, spring, thud, wobbling, under, vibration, wooden, muted, organic, medium, metallic, odd, padded, reverberate, springy, strange, string, thin, tub, twang, bow, bowl, braud, brittle, bump, bumpy, button, cartoonish, corridor, declines, deep, sea, huge, hum, inconsistent, jello, jump, kettle, knock, long, marble, matches, muffled, sharp, sheet, ship, silly, size, space, staticky, stick, strip, table, weird, wiggle, wiggly, delayed, dense, dirty, distant, dropping, oscillating, tight, tinny, trampoling, tube, tubular, ping.

- In only haptic condition

Number of selection Slected rate (Number of selection/number of trial) Words
29 83 % bouncy
18 51 % short
19 54 % buzz
14 40 % hard
11 31 % echo
10 29 % fast, hollow
8 23 % light, rumbling, soft, spring
7 20 % medium
6 17 % heavy, rubbery, strong
5 14 % purring, rubber, rumble, vibrate
4 11 % fuzzy, small, solid, steady, tap
3 9 % button, click, delayed, immediate, lifting, press, rattle, thump
2 6 % aftershock, ball, band, constant, drop, electric, followed, gentle, grumbling, consistent
1 3 % agressive, beat, bloop, coursing, decline, delayed, down, dull, lamp, landing, long, low, momentum, muted, post, prolonged, pulse, quiet, slipping, smooth, springing, sticky, strength, strokem sudden, sustained, tapping, taught, thumping, top, weak, shaking, shaky, slapping, jolt, knuckle, wiggly, jumping, quick, responsive, sharp, shock, stroking, subtle, thud, tremble, twanging, wiggle, firm, force, forceful, gristley, gritty, grumbley, humming, immediate, increasing, jiggle, rapid, repeated, resonant, reverb, reverberation, rough, rubber-ball, shake, thin, thumps, thunder, thwack tickle, tickles, trembling, twang, weird.

3. ALL R-square value of regression in MDS perceptual space

Scale Haptics & Sound condition 2D Haptics & Sound condition 3D Only Haptics condition 2D Only Haptics condition 3D
Hard 0.61 0.53 0.67 0.83
Deep 0.89 0.94 0.96 0.96
Echoing 0.82 0.86 0.22 0.76
Bouncy 0.88 0.99 0.62 0.69
Buzz 0.48 0.41 0.89 0.95
Thud 0.69 0.84 0.26 0.63
Metallic 0.79 0.79 0.66 0.80
Rubbery 0.79 0.85 0.79 0.83
Rumbble 0.80 0.83 0.89 0.90
Wobbly 0.94 0.93 0.74 0.82
Hollow 0.11 0.84 0.72 0.73
Real 0.69 0.68 0.49 0.59