At the end of the discussion on the nature of mental images,your textbook re-examines the analog viewpoint and the propositional viewpoint,in light of the accumulated research.According to this discussion,

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The re-examination of the two viewpoints in light of research suggests that most mental imagery tasks use an analog code, but some may use a propositional code. This indicates that the two viewpoints are not necessarily incompatible, and that researchers can support either perspective depending on the task at hand. Additionally, the propositional viewpoint does not necessarily argue that people do not experience actual mental images; rather, it argues that mental images are not identical to the objects they represent. Finally, the evidence regarding the ability to re-examine mental images and provide new interpretations is actually more favorable to the propositional viewpoint than the analog viewpoint.

At the End of the Discussion on the Nature of Mental