He chunked the digits into running times and came up with a retrieval structure. The same technique was taught to a 2nd subj. This indirect method solves the challenge of building a scientific understanding of processes that are not themselves directly observable. Seems to be of unlimited capacity. The key is to have multiple retrieval pathways.
Activation spreads to connected items.
Just as our active processes can result in perceptual distortion, so too can they result in memory distortion. This was the research of Brooks, who presented block letters and sentences. These results suggest we have different codes in memory. Similarly with the Kosslyn island scanning experiment. All argue for a spatial quality to some of the mental operations involved in thought.