In interference, information learned earlier disrupts the recall of information learned more recently; in interference, recently learned information disrupts the recall of information learned earlier.

proactive;retroactive                        

Explanation:

Proactive interference: In psychology, the term "proactive interference" is described as a condition that occurs when an individual tries to memorize remember a particular list or piece of information including formulas, words, ideas, names, etc then the formerly remembered part of the information or list comes in the way when he or she is trying to remember the later part of the particular list.

Retroactive interference: In psychology, the term "retroactive interference" is described as a condition that arises when an individual forgets a formerly learned task or information because of learning a whole new task or information.

In the question above, the given statement signifies the proactive and retroactive interference.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.

stable food supply,social structure, government,religion,culture/art,technology and writing/language;