In hybrid foraging, observers search for multiple instances of multiple target types. Children
regularly perform such tasks (e.g., collecting LEGO pieces or looking for different teammates
within a game). Quitting rules (When do you leave the search?) are important in foraging (e.g., I
found enough LEGOs or teammates). However, the development of quitting behavior has not yet
been experimentally studied, and it could give us significant information about executive function
development. We tested 279 observers (4–25 years old) using classic feature and conjunction
foraging. The results show that while children’s performance improved with age, all groups made
similar "quitting" decisions roughly following optimal choices as defined by Charnov’s Marginal
Value Theorem (MVT), with the youngest 4–5 years old children quitting slightly earlier. It seems
that mature quitting rules in search operate relatively early in development, suggesting that those
rules are quite basic aspects of the human cognitionThis work was supported by the Research Grant Project PSI2015–69358-R (MINECO/FEDER) “Ministerio de Economía y Competitividad” (MINECO), and “Fondo Europeo de Desarrollo Regional” (FEDER), given to Beatriz Gil-Gomez ´ de Liano ˜ as PI. Also, part of
the research of this study was done thanks to the Fulbright Commission, and the European Union’s Horizon 2020 research and
innovation program, Marie Sklodowska-Curie Actions, under grant FORAGEKID 793268, also granted to Beatriz Gil-Gomez de Liaño at
the University of Cambridge, Universidad Complutense de Madrid and BWH-Harvard Medical School, and by NIH EY017001 given to
Jeremy M. Wolf