The reading assignment here is: Chapters 10.1, 10.2, and this webpage: http://cse1.net/recaps/4-memory.html, which surveys the same topic with a more modern discussion. You may wish to read the webpage first, and then skim through the book chapter.
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In order to create video or audio recordings your computer needs to be
webcam-enabled. If you don't have a webcam on your computer, you can still
record audio-only messages by first installing the Google Video Chat