Astrategy of "planned ignoring" is most likely to be effective in reducing which kind of student conduct?

attention seeking behavior                  

Explanation:

         Planned ignoring is a procedure which is designed to eliminate or decrease an inappropriate behavior of a student by withdrawing the reinforcer abruptly which is responsible for maintaining the behavior.

         For a conduct of attention seeking behavior of a student, the strategy used to correct their behavior is "planned ignoring". With this method, a student is given less attention for engaging in any misbehavior but providing attention ti him when he is not engaged in any kind of misbehavior.

Thus the answer is -- "attention seeking behavior".

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