Table 1.
Participants’ biographic information.
Fig 1.
An example of how to identify chunks by comparing order of pieces recalled in Trial 1 (A) to Trial 2 (B), and comparing Trial 1 to Trial 5 (C), the open-circled piece indicates the start of recall.
Table 2.
Correlations between two measures of chunk characteristics for each board under each experimental condition (N = 50).
Fig 2.
An example of a chunk identified by repeated-recall technique and RT technique, the open-circled piece indicates the start of recall: Arrows with full lines indicate the order of pieces recalled on Trial 1 (A), and arrows with dotted lines indicate the order of pieces recalled on Trial 2 (B).
Table 3.
Correlations between Board 1 and Board 2 on characteristics of chunks estimated by two techniques.
Table 4.
Hierarchical regression analyses of characteristics of repeated-recall and RT techniques on one Board to predict memory performance on the other Board in each experimental condition.
Table 5.
The results of linear mixed model analyses for memory performance and two basic chunk characteristics for all players.
Fig 3.
Number of chunks as a function of type of position for different skill groups (A) and number of chunks as a function of chess skill for different types of positions for rated chess players (B).
Table 6.
The results of linear mixed model analyses for memory performance and two basic chunk characteristics for rated chess players.
Table 7.
Summary of differences between rated chess players and non-chess players and their relations to chess skill and memory performance.
Fig 4.
Size of the largest chunks as a function of type of position for different skill groups.
Fig 5.
Inter-piece latency as a function of number of inter-piece chess relations (data pooled over type of positions and skill levels).
Fig 6.
An example of a different ordered chunk recalled by a Class A chess player, where the open-circled piece indicates the start of recall: Arrows with full lines indicate the order of pieces recalled on Trial 1 (A), and arrows with dotted lines indicate the order of pieces recalled on Trial 2 (B).