Neil has difficulty relating to his family members as well as his peers. He cringes when his mother tries to hug him, and he avoids eye contact when someone is speaking to him. These behaviors are characteristic of , a key feature of autistic disorder.

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.

answer; consonant;

answer; strength of association;