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An idea

ADD children are "easily aroused" which would fit your "facilidad para activarse".

Not sure how the same term fits "no fomentar la activación del niño. Something like: don't encourage child to be overaroused.

This site may be of use:
http://www.troubledwith.com/ParentingChildren/A000000367.cfm...


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Note added at 2 hrs (2010-03-11 01:31:19 GMT)
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Yes, I guess you are right, Lisa. Some useful terms get corrupted and become "dirty".

The first mention of "activarse" seems very clearly intended to mean 'act up' (or often incorrectly phrased 'act out)'- possibly a translation of original English. So I'm assuming "activación' is a reference back to "activarse".

Below is a quote from an article explaining the difference between 'acting out' and 'acting up':

Acting-up, (i.e. conscious, deliberate misbehaving) is NOT acting-out. It is truly appalling how many times people use the term acting out to refer to someone who’s simply exhibiting undesirable behavior. I hear TV commercials by behavioral therapists offering to fix your child’s “acting-out” behaviors, and see rules in psychiatric hospitals and residential centers forbidding “sexual acting-out” or other inappropriate conduct. One online psychiatric glossary even gave two definitions for acting-out, one correct, the other being the mistaken notion that has so deeply crept into the popular lexicon that it’s made a correct understanding of the concept almost impossible.
The real danger in misusing this term ['acting out'] is that one can make a disastrous presumption that every time someone acts in an inappropriate manner, they’re necessarily and unconsciously playing out some kind of inner conflict (i.e. unresolved “issues”), when the fact may be that they’re simply engaging in immature, irresponsible behavior which they’re aware they shouldn’t be doing and that’s completely within their ability to control. Misperceiving the nature of circumstances is a major way people end up being abused by irresponsible characters. It’s also how clinicians inadvertently enable irresponsible behavior instead of fostering real change. Words mean things. We can’t communicate effectively unless we use words correctly. To do that, we have to know what the words actually mean. Acting-up is not acting-out.
http://www.manipulative-people.com/acting-out-top-5-misused-...




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Note added at 11 hrs (2010-03-11 10:45:00 GMT)
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If the idea is 'act up', then what we don't want to do is encourage this behavior.

Want to give your child a champion start?
The right fuel helps kids perform at their best. By eating healthy, your child will ... Your child's activity levels influence the amount of food needed. ...
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Note added at 20 hrs (2010-03-11 20:10:05 GMT)
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#
Activity Level and Hyperactivity in Twins
by L Willerman - 1973 - Cited by 119 - Related articles
Activity Level and Hyperactivity in Twins. Lee Willerman. University of Texas at Austin. WILLERMAN, LEE. Activity Level and Hyperactivity in Twins. CHILD ...
www.jstor.org/stable/1128049
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Parental management of inappropriate hyperactivity in a young ...
by F Henry - 1975
THE HYPERACTIVE child has been described in the experimental literature and by ... a behavioral assessment of activity level placed the child's activity ...
linkinghub.elsevier.com/retrieve/pii/000579167590110X
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Activity level patterns in the hyperactive ritalin responder and ...
The activity level of ten hyperactive children (five who were Ritalin responders ... articles published in Journal of Clinical Child & Adolescent Psychology ...
www.informaworld.com/smpp/.../content~db=all~content=a91609...