Talk in crit
Critique is considered by many to be the most important part of attending RISD. After hours, days or weeks creating your work, in addition to a probable lack of sleep, it's tempting to just lapse into silence and let the words flow over your head. After all, there's not really any direct consequence of not speaking up. The problem is that almost everyone thinks this way, and if enough people are loath to engage in discussion, critiques will just consist of the professor's opinion with some uncomfortable silence mixed in. It's better to just chime in, even if you have no idea what you're talking about (which you probably won't the first couple of times.)
Another reason to talk in crit is that professors love it (maybe because that way they don't have to say as much). Throughout my foundation year, the students that spoke up the most were consistently on better terms with the professors, and being on better terms with the professors leads to getting better grades from those professors.