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Bright lights that make your eyes squint shut are an example of visual stimuli.
In point of fact, many stimuli are beneath the " threshold " of a man's consciousness.
The threshold-value of the stimuli adequate for the various senses may be extraordinarily lowered.
Breath holding spells are episodes of brief, involuntary cessations of breathing that occur in children in response to stimuli such as anger, frustration, fear, or injury.
It is easy to realize how such a rhythm can be modified by the reception of stimuli, and can consequently serve as the basis for the movement of the stimulated organ.
By the rules of induction from concomitant variations, we are logically bound to infer the realistic conclusion that outer physical stimuli cause inner sensations of sensible effects.