PT  - JOURNAL ARTICLE
AU  - Laure Tosatto
AU  - Joël Fagot
AU  - Dezso Nemeth
AU  - Arnaud Rey
TI  - The Evolution of Chunks in Sequence Learning
AID  - 10.1101/2021.02.12.430894
DP  - 2021 Jan 01
TA  - bioRxiv
PG  - 2021.02.12.430894
4099  - http://biorxiv.org/content/early/2021/02/12/2021.02.12.430894.short
4100  - http://biorxiv.org/content/early/2021/02/12/2021.02.12.430894.full
AB  - Chunking mechanisms are central to several cognitive processes and notably to the acquisition of visuo-motor sequences. Individuals segment sequences into chunks of items to perform visuo-motor tasks more fluidly, rapidly, and accurately. However, the exact dynamics of chunking processes in the case of extended practice remain unclear. Using an operant conditioning device, eighteen Guinea baboons (Papio papio) produced a fixed sequence of nine movements during 1,000 trials by pointing to a moving target on a touch screen. Response times analyses revealed a specific chunking pattern of the sequence for each baboon. More importantly, we found that these patterns evolved during the course of the experiment, with chunks becoming progressively fewer and longer. We identified two chunk reorganization mechanisms: the recombination of preexisting chunks and the concatenation of two distinct chunks into a single one. These results provide new evidence on chunking mechanisms in sequence learning and challenge current models of associative and statistical learning.Competing Interest StatementThe authors have declared no competing interest.