PITT, OHSU: When early life stress occurs determines its im...( ries of monkeys and noticed differences...),Health

ries of monkeys and noticed differences in behavior related to the timing of separation, explained Cameron. Monkeys separated at one week were less social when they were young, a characteristic that continues on into adulthood. The monkeys tended to exhibit a higher than normal amount of self-comforting behaviors such as thumb or toe sucking. In addition, these monkeys tended to have less social dominance in the group setting, perhaps in relation to their reduced social skills. In contrast, monkeys separated at one month displayed increased seeking of social comfort and an increase in social dominance. In adulthood, these same monkeys spent more time involved in social play when compared to animals in the other groups. They also tended to be more dominant than other monkeys.

Researchers also tracked the responses of these three groups of animals in adulthood when they were placed with new social groups. The one-week separated animals seemed to be the most agitated by this social change. They tried many new behaviors, increased social behavior to the level of other groups of monkeys, increased in social dominance, but also threatened other monkeys more often. The one-month separated animals showed changes in eating behaviors and decreased play when placed in new social groups. In summary, the response to stress in adulthood was strongly influenced by whether and when animals had experienced stress in early life.

One important note is that earlier research suggests that stress sensitivity is heightened in individuals that undergo stresses early in life. This research shows that is not always the case and is at least partially dependent on the timing of the early-life stress.

The second, separate study that was conducted by the same research team extended the understanding of early life stress impacts. The study revealed the important role that timing plays in preventing behavioral problems associated with exposure to significant stresses d
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24-Oct-2004

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