Effort cost of harvest affects decisions and movement vigor of marmosets during foraging
Our decisions are guided by how we perceive the value of an option, but this evaluation also affects how we move to acquire that option. Why should economic variables such as reward and effort alter the vigor of our movements? In theory, both the option that we choose and the vigor with which we mov...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
eLife Sciences Publications Ltd
2023-12-01
|
| Series: | eLife |
| Subjects: | |
| Online Access: | https://elifesciences.org/articles/87238 |
| _version_ | 1797393459755089920 |
|---|---|
| author | Paul Hage In Kyu Jang Vivian Looi Mohammad Amin Fakharian Simon P Orozco Jay S Pi Ehsan Sedaghat-Nejad Reza Shadmehr |
| author_facet | Paul Hage In Kyu Jang Vivian Looi Mohammad Amin Fakharian Simon P Orozco Jay S Pi Ehsan Sedaghat-Nejad Reza Shadmehr |
| author_sort | Paul Hage |
| collection | DOAJ |
| description | Our decisions are guided by how we perceive the value of an option, but this evaluation also affects how we move to acquire that option. Why should economic variables such as reward and effort alter the vigor of our movements? In theory, both the option that we choose and the vigor with which we move contribute to a measure of fitness in which the objective is to maximize rewards minus efforts, divided by time. To explore this idea, we engaged marmosets in a foraging task in which on each trial they decided whether to work by making saccades to visual targets, thus accumulating food, or to harvest by licking what they had earned. We varied the effort cost of harvest by moving the food tube with respect to the mouth. Theory predicted that the subjects should respond to the increased effort costs by choosing to work longer, stockpiling food before commencing harvest, but reduce their movement vigor to conserve energy. Indeed, in response to an increased effort cost of harvest, marmosets extended their work duration, but slowed their movements. These changes in decisions and movements coincided with changes in pupil size. As the effort cost of harvest declined, work duration decreased, the pupils dilated, and the vigor of licks and saccades increased. Thus, when acquisition of reward became effortful, the pupils constricted, the decisions exhibited delayed gratification, and the movements displayed reduced vigor. |
| first_indexed | 2024-03-09T00:02:53Z |
| format | Article |
| id | doaj.art-509b43d1f9a0427eb178e376cc4bd476 |
| institution | Directory Open Access Journal |
| issn | 2050-084X |
| language | English |
| last_indexed | 2024-03-09T00:02:53Z |
| publishDate | 2023-12-01 |
| publisher | eLife Sciences Publications Ltd |
| record_format | Article |
| series | eLife |
| spelling | doaj.art-509b43d1f9a0427eb178e376cc4bd4762023-12-12T13:42:31ZengeLife Sciences Publications LtdeLife2050-084X2023-12-011210.7554/eLife.87238Effort cost of harvest affects decisions and movement vigor of marmosets during foragingPaul Hage0In Kyu Jang1Vivian Looi2Mohammad Amin Fakharian3Simon P Orozco4Jay S Pi5Ehsan Sedaghat-Nejad6Reza Shadmehr7https://orcid.org/0000-0002-7686-2569Laboratory for Computational Motor Control, Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore, United StatesLaboratory for Computational Motor Control, Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore, United StatesLaboratory for Computational Motor Control, Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore, United StatesLaboratory for Computational Motor Control, Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore, United StatesLaboratory for Computational Motor Control, Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore, United StatesLaboratory for Computational Motor Control, Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore, United StatesLaboratory for Computational Motor Control, Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore, United StatesLaboratory for Computational Motor Control, Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore, United StatesOur decisions are guided by how we perceive the value of an option, but this evaluation also affects how we move to acquire that option. Why should economic variables such as reward and effort alter the vigor of our movements? In theory, both the option that we choose and the vigor with which we move contribute to a measure of fitness in which the objective is to maximize rewards minus efforts, divided by time. To explore this idea, we engaged marmosets in a foraging task in which on each trial they decided whether to work by making saccades to visual targets, thus accumulating food, or to harvest by licking what they had earned. We varied the effort cost of harvest by moving the food tube with respect to the mouth. Theory predicted that the subjects should respond to the increased effort costs by choosing to work longer, stockpiling food before commencing harvest, but reduce their movement vigor to conserve energy. Indeed, in response to an increased effort cost of harvest, marmosets extended their work duration, but slowed their movements. These changes in decisions and movements coincided with changes in pupil size. As the effort cost of harvest declined, work duration decreased, the pupils dilated, and the vigor of licks and saccades increased. Thus, when acquisition of reward became effortful, the pupils constricted, the decisions exhibited delayed gratification, and the movements displayed reduced vigor.https://elifesciences.org/articles/87238foraging theorydecision makingsaccadesvigormarmosets |
| spellingShingle | Paul Hage In Kyu Jang Vivian Looi Mohammad Amin Fakharian Simon P Orozco Jay S Pi Ehsan Sedaghat-Nejad Reza Shadmehr Effort cost of harvest affects decisions and movement vigor of marmosets during foraging eLife foraging theory decision making saccades vigor marmosets |
| title | Effort cost of harvest affects decisions and movement vigor of marmosets during foraging |
| title_full | Effort cost of harvest affects decisions and movement vigor of marmosets during foraging |
| title_fullStr | Effort cost of harvest affects decisions and movement vigor of marmosets during foraging |
| title_full_unstemmed | Effort cost of harvest affects decisions and movement vigor of marmosets during foraging |
| title_short | Effort cost of harvest affects decisions and movement vigor of marmosets during foraging |
| title_sort | effort cost of harvest affects decisions and movement vigor of marmosets during foraging |
| topic | foraging theory decision making saccades vigor marmosets |
| url | https://elifesciences.org/articles/87238 |
| work_keys_str_mv | AT paulhage effortcostofharvestaffectsdecisionsandmovementvigorofmarmosetsduringforaging AT inkyujang effortcostofharvestaffectsdecisionsandmovementvigorofmarmosetsduringforaging AT vivianlooi effortcostofharvestaffectsdecisionsandmovementvigorofmarmosetsduringforaging AT mohammadaminfakharian effortcostofharvestaffectsdecisionsandmovementvigorofmarmosetsduringforaging AT simonporozco effortcostofharvestaffectsdecisionsandmovementvigorofmarmosetsduringforaging AT jayspi effortcostofharvestaffectsdecisionsandmovementvigorofmarmosetsduringforaging AT ehsansedaghatnejad effortcostofharvestaffectsdecisionsandmovementvigorofmarmosetsduringforaging AT rezashadmehr effortcostofharvestaffectsdecisionsandmovementvigorofmarmosetsduringforaging |