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2. Physiological Effects

When a person with acrophobia is in a high area or anticipates being there, their sympathetic nervous system becomes overactive and triggers the body's fight-flight-or-freeze response. Normally, this system acts as an adaptive measure to prepare for a dangerous situation. In a person with acrophobia, this response occurs even when there is no immediate danger. This is particularly interesting because there is little a person can do about heights other than leaving for a lower area.

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