http://dictionary.reference.com/browse/sentient
having the power of perception by the senses; conscious.
http://en.wikipedia.org/wiki/Sentience
Sentience is the ability to feel, perceive, or be conscious, or to have subjective experiences
I think insects are sentient based on most defintions (i.e. they perceive and have senses).
You are not required to participate. If you think the OP and even my attempts at clarifications are too vague, you are welcome to not comment in the thread. Everybody else seems to have gotten the concept.