Wednesday, October 30, 2013

Memory

On a recent trip to visit my former home of Cambridge, I found myself playing piano and singing with friends on several occasions. The last night I was there, I opened a Broadway songbook to a tune by a man whom one friend dubbed the "Kenny G of musical theatre"-- namely, Andrew Lloyd Weber. The tune was from Cats:
Daylight
I must wait for the sunrise
I must think of a new life
And I mustn't give in
When the dawn comes
Tonight will be a memory too
And a new day will begin.
Jibing aside, ALW has some out-of-the-ballpark hits, and although I feel most of my friends cringe every time I want to play the song, I can't shake the notion that "Memory" is one of them. If you took the song out of the context of the musical Cats and handed it to a soulful songstress to sing, I firmly believe that we'd think of it a little differently. But more to the point, Weber uses the term "memory" quite aptly in his music, showing that the here and now will one day become a memory too. And maybe the memories of multiple nights spent walking down memory lane will be consolidated into a more abstract memory.

Memory has been on my mind a lot recently, and not just memories of old friends in old towns. In a seminar class in the linguistics department, we are reading papers devoted language and what psychologists call "working memory" -- the memory for stuff we're doing in the here and now, and theorized to include some set of representations that occupy a more privileged status than other stuff. In my own research, I think more about that other stuff, i.e., "long-term memory" -- the imprint we have of all our experiences, plus a whole helluvalotta hypothesized structure which leaves us with many theorized types of memories. "Procedural memory" refers to learned behaviors, mostly typified as motor skills or procedures. Examples might be playing a musical instrument, riding a bike, lots of what goes into driving a car, and, some would say, even certain aspects of language processing. "Declarative memory" refers to memories for facts about the world and the stuff in it ("semantic memory") and to memories for particular events, or episodes, that we have personally encountered (so-called "episodic memory"). For my own part, I'm very interested in understanding how this last breakdown (between memory for stuff we know, or at least think we know, and memory for stuff we've directly experienced) should be thought about. Surely the stuff we directly experience can become part and parcel of the stuff of "facts" that we know -- we see a lot of red apples, and so we come to believe that apples are (at least often) red. But what's the internal organization of all that, and what stuff do we actually access when we're talking about apples?

There are plenty of questions to ask with regard to language and long-term memory. Whether understanding someone who is talking about apples requires someone to engage in processing all of the perceptual information about apples (such as their color) is a question that is part of a hot topic in cognitive science currently. But in my own research, I hope to answer a slightly broader question, which gets at some of the same nitty-gritty questions regarding which features of a concept are accessed during its processing--does the amount of information about (or experience with) a concept directly affect how easily it is processed during language comprehension? The structure of that information will almost certainly have consequences for processing, as well.  For instance, the information might be neatly bundled together (let's say we are apple experts and know that really red apples are also shiny and large, encompassing information about perceptual aspects of apples) or more sparse (perhaps we don't really know much about red apples other than we've seen them grow on trees in Washington, and our parents used to pack them in our lunches when we were kids, facts that are not as neatly related).

In my research, I'm starting out by investigating these kinds of questions using short texts (jargon-y term here would be "discourse") where I manipulate the amount of information that is given about various people who are described in the text.  But what I really want to know is how understanding language about stuff we really know a ton about (people who are very close to us; topics we've spent years studying; our favorite hobby, whether it be cooking or painting or singing; cities we know well) might differ from understanding language about stuff that's more vague to us (sort of like when I hear my friends talking about baseball in front of me; or like when I talk about sight-reading choral music to the people talking to me about baseball!).

I'm thinking our rich memories may help us understand each other at times and perhaps hinder our communication at others.