A second phase might involve exposing to subject to motion pictures of moderate elevation, again without actually experiencing any elevation himself or herself. A third phase of the process could involve exposing the subject to the mildest degree of stimuli that involve physical involvement, such as sitting by a closed window at an elevation well below the height at which the subject firs begins to experience a phobic response. Subsequently, the window might be opened and the subject allowed to become comfortable sitting next to it; the subject would then be encouraged to gradually increase the height of the window until it first approached the height at which the subject first begins to experience a physiological reaction. According to practicing and psychologists (Shapiro, 2002) and psychological theorists alike, (Gerrig & Zimbardo, 2008), the most crucial aspect of successful systematic...

Only then would the subject be encouraged to proceed to the next highest window, and ideally, the individual floors would have a relatively small difference from one to the next. Eventually, the subject would likely be able to raise his r her threshold where a phobic reaction occurs until the altophobic response is substantially reduced or even eliminated entirely.
References

Gerrig, R. And Zimbardo, P. (2008). Psychology and Life. Princeton, NJ: Pearson.

Shapiro, D. (2002). Neurotic Styles. New…