Your textbook discussed in some detail a study by Rueckl and Oden (the "bears/beans" study). These researchers manipulated both the features of a letter within a word and the context in which the word appeared. This study demonstrated that

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The "bears/beans" study by Rueckl and Oden demonstrated that both bottom-up processing (the analysis that begins with the sensory receptors and works up to the brain's integration of sensory information) and top-down processing (the use of preexisting knowledge to organize individual features into a unified whole) are operational in understanding how context and letter features affect word recognition. This shows the interplay between the sensory input and the cognitive processing of that input.

Your Textbook Discussed in Some Detail a Study by Rueckl