Sony ERS-110 - Manual (Page 60)

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Other robotic expressions
Although body language is the most direct way for AIBO to
show its emotions or desires, it has other means of expressing
itself. When in the autonomous mode, AIBO is always in one
robotic state of mind or another. AIBO shows these states by
using robot language or flashing its eye lamps. To express its
physical condition, AIBO uses its chest lamp.
Robot language and sound effects
AIBO emits sounds in various situations of its daily life. It emits
sounds as if talking to itself when it receives a command, when
waking up, when playing, or when it has something to say.
When in a better mood or situation, AIBO will emit sounds or
play more melodic tonal phrase.
Eye lamps
When you send a command,
approve or scold AIBO, it
acknowledges by blinking its
eye lamps for a second. The
lights also indicate changes in
its emotional state which may
help you detect its current
mood.
Chest lamp
AIBO uses the chest lamp to show its physical condition, especially the
remaining battery power.
On
In action
Flashing
slowly
Sleeping
Flashing
Charging
posture
Off
Power off
Flashing
rapidly
Internal
trouble
A psychological peek into your
robot
Joy Anger Surprise
(Flashing alternately)