Word meaning and sentence comprehension

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Language is a major part of what makes us human. The broad objective of my research is to understand how people interpret what they hear and read, how this knowledge develops in children, and how it becomes degraded due to brain impairments. My research is roughly divided into two parts. In one part, I and my collaborators study people's memory for the meaning of words that refer to living things such as dog, and nonliving things such as toaster. To do this, we use "neural networks", which are models of mental processing that are written as computer programs. We have built a series of neural networks that produce the meaning of words like toaster given how the word is spelled or pronounced. We study how our models work and then use that knowledge to come up with predictions that we test on human participants. This testing typically involves looking at the time it takes for people to answer questions like, "Does a shirt have a pocket?" or "Does the word dog refer to something you can touch?" We also damage our models by altering the program so that part of the simulated mind no longer works correctly. We then test whether the damaged model mimics the performance of people who have suffered brain damage.