If you are researching the topic and cannot find the specific PDF, you can look for academic papers or summaries on these specific concepts that Goldstein is famous for discussing:
Memory is the silent partner in every perceptual act. According to Goldstein, we do not perceive the world as it is, but as we are. Memory provides the context necessary for recognition. For instance, when we see a set of black lines on a page, our sensory system detects the contrast (sensation), but our memory allows us to identify those lines as "letters" and "words" (perception). If you are researching the topic and cannot