Full Idea
For Aristotle, pleasure is the perception of particulars as valuable.
Gist of Idea
For Aristotle, pleasure is the perception of particulars as valuable
Source
comment on Aristotle (Nicomachean Ethics [c.334 BCE], 1173b20) by Deborah Achtenberg - Cognition of Value in Aristotle's Ethics 5.6
Book Reference
Achtenberg,Deborah: 'Cognition of Value in Aristotle's Ethics' [SUNY 2002], p.152
A Reaction
This never strikes me as very plausible. Pleasure may be a side-effect of the perception of value, but we can experience pleasure (e.g. a taste) without even knowing what the cause is, let alone whether we value it.