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The ability to respond to external stimuli will also decrease.

The trigger is usually some external stimulus, not necessarily an obvious one.

"In every situation, there is an external stimulus that guides his response."

In particular, one external stimulus may give different experiences to the same individual according to which eye is used.

Given no external stimuli, they were forced back upon themselves.

The eye's reaction to external stimulus is an activity, not a passive response.

Light is the external physical stimulus of the retina's activity.

His mind shattered, he could relate to no external stimuli.

The key external stimulus is variation in light and darkness over the course of the day.

This may be caused by a failure to recognize external stimuli for what it is.