Human–Computer Interaction

49

Human faCtors as HCI tHeorIes

vibratory stimulation (10–500 Hz), and Ruffini endings for skin

stretch (Figure3.15).

While there are many research prototypes and commercial tactile

display devices, the most practical one is the vibration motor, mostly

applied in a single actuator configuration. Most vibration motors do

not offer separate controllability for amplitude and frequency. In addi-

tion, most vibrators are not in direct contact with the stimulation tar-

get (e.g., the hand), making the signal somewhat muffled through the

casing. us additional care is needed to set the right parameter values

for the best effects under the circumstances.

Ano