aspect to stressful situations is among the greatest in number common human experiences.

aspect to stressful situations is among the greatest in number common human experiences. These marks of situations can range from unexpect calamities to routine daily annoyances. In reply to stressors, a series of behavioral, neurochemical, and immunological changes come into view that ought to serve in an adaptive capacity. However, if those classifications become overly taxed, the organism may become vulnerable to pathology. Likewise, the biological changes, if sufficiently sustained, may themselves adversely affect the organism's well-being. Several factors may dictate an individual's replication to environmental stressors, including characteristics of the stressor (i.e., archetype of stressor and its controllability, predictability, and chronicity); biological factors (i.e., age, form relative to sex and genetics); and the subject's previous stressor history and early life experiences. Research in succession the physiological and psychological replys to different types of stressful stimuli is quick in emergenciesed focusing particularly on processes that may be releva nt to the increase of alcohol use disorders. Stressful results may profoundly influence the use of alcohol or other unsalable articles (AODs). For example, the resumption of AOD use after a long period of abstinence may cogitate a person's attempt to self-medicate to attenuate the adverse psychological dependence of cause and effects of stressors (e.g., anxiety). Alternatively, stres may increase the reinforcing imports of AODs. KEY WORDS: psychological stress; physiological stress; sensory stimuli; conditioned response; unconditioned response; coping skills; neurotransmitters; brain; neurochemistry; biological adaptation; animal model; genetics and heredity; inflection for sex differences; age differences; life event; AQDD (AOD use disorders); literature review

front to stressful situations is among the in the greatest degree common human experiences. These prototypes of situations can range from unexpect calamities (eg bereavement, natural disaster, or illness) to routine daily annoyances. Regardless of their grade of severity, however, stressors may advance physiological and behavioral disturbances, ranging from psychiatric disorders (Brown 1993) to immune body dysfunction (Herbert and Cohen 1993) Stressful marked occurrences also may profoundly influence the use of alcohol or other medicines (AODs). For example, the resumption of AOD use after a long period of abstinence may consider a person's attempt to self-medicate to attenuate the adverse psychological consecutions of stressors (e.g., anxiety). Alternatively, stres may increase the reinforcing powers of AODs.

This article provides a working definition of stres and describes research in succession the physiological and psychological answers to different types of stressful stimuli, focusing particularly forward processes that may be relevant to the disclosure of alcohol use disorders.

STRESS: A WORKING DEFINITION

As commonly used, the space of time "stressor" indicates a situation or incident appraised as being aversive in that it elicits a stres answer which taxes a person's physiological or psychological resources as well as possibly kindles a subjective state of physical or mental tension. As relevant scientific data have accumulated, however, a simple, universally accepted definition of stres has become increasingly elusive.

This article focuses in succession some of the factors that may influence the mechanisms by means of which a person responds to stressful situations (i.e., stressors). a great deal of the information presented here is based onward animal research, which can provide essential information not obtainable from human studies. However, the human stres answer is influenced by a army of personality characteristics and life experiences that cannot be duplicated in animal studies. Other articles in this issue provide more specific information forward possible interactions between stress and human behavioral answers such as alcohol consumption.

Many researchers view the stres replication as an adaptive mechanism designed to maintain the relative stability of the body's overall physiological functioning (i.e., homeostasis) in replication to a challenge. However, not all stres replications are clearly adaptive. Some physiological reactions to stres that appear to advise short-term benefits are followed according to adverse long-term repercussions. In other instances, changes that appear to have adverse results may, on closer examination, divert out to be beneficial. Finally, near changes that may have little positive value and no adaptive significance may besides comprise part of the overall stres response

The ambiguity of the stres reply can be illustrated by examining the functions of cortisol, a hormone released through the adrenal glands in replication to stressful stimuli (see sidebar, page 247) Among other functions, cortisol helps stir up the release of energy stores essential for coping with stres even now cortisol may suppress the normal functioning of the immune a whole a response that could theoretically supply the body more susceptible to infectious diseases. However, cortisol-induced immune suppression also may assist a protective function (Munck et al. 1984) preventing the evolution of illnesses characterized by immune attack upon the body's own tissues (eg rheumatoid arthritis). equal when cortisol release has adaptive chain of cause and effects the elevated cortisol levels persist for an stretch outed period, then the adaptive nature of the answer may be lost and adverse tenors may ensue. Thus, what we consider to be an adaptive short-term reply may subsequently provoke long-term pathophysiological consequenc e (Sapolsky et al., 1986)