Kagan, Igor

[["dc.bibliographiccitation.artnumber","1868"],["dc.bibliographiccitation.firstpage","1"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Scientific Reports"],["dc.bibliographiccitation.lastpage","14"],["dc.bibliographiccitation.volume","10"],["dc.contributor.author","Rollwage, Max"],["dc.contributor.author","Pannach, Franziska"],["dc.contributor.author","Stinson, Caedyn"],["dc.contributor.author","Toelch, Ulf"],["dc.contributor.author","Kagan, Igor"],["dc.contributor.author","Pooresmaeili, Arezoo"],["dc.date.accessioned","2020-05-29T12:29:22Z"],["dc.date.accessioned","2021-10-27T13:22:13Z"],["dc.date.available","2020-05-29T12:29:22Z"],["dc.date.available","2021-10-27T13:22:13Z"],["dc.date.issued","2020"],["dc.description.abstract","Estimating invested effort is a core dimension for evaluating own and others’ actions, and views on the relationship between effort and rewards are deeply ingrained in various societal attitudes. Internal representations of effort, however, are inherently noisy, e.g. due to the variability of sensorimotor and visceral responses to physical exertion. The uncertainty in effort judgments is further aggravated when there is no direct access to the internal representations of exertion – such as when estimating the effort of another person. Bayesian cue integration suggests that this uncertainty can be resolved by incorporating additional cues that are predictive of effort, e.g. received rewards. We hypothesized that judgments about the effort spent on a task will be influenced by the magnitude of received rewards. Additionally, we surmised that such influence might further depend on individual beliefs regarding the relationship between hard work and prosperity, as exemplified by a conservative work ethic. To test these predictions, participants performed an effortful task interleaved with a partner and were informed about the obtained reward before rating either their own or the partner’s effort. We show that higher rewards led to higher estimations of exerted effort in self-judgments, and this effect was even more pronounced for other-judgments. In both types of judgment, computational modelling revealed that reward information and sensorimotor markers of exertion were combined in a Bayes-optimal manner in order to reduce uncertainty. Remarkably, the extent to which rewards influenced effort judgments was associated with conservative world-views, indicating links between this phenomenon and general beliefs about the relationship between effort and earnings in society."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2020"],["dc.identifier.doi","10.1038/s41598-020-58686-0"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/17354"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/92076"],["dc.language.iso","en"],["dc.notes.intern","Migrated from goescholar"],["dc.relation.eissn","2045-2322"],["dc.relation.orgunit","Universitätsmedizin Göttingen"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.subject.ddc","612"],["dc.title","Judgments of effort exerted by others are influenced by received rewards"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","e0202581"],["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","PLOS ONE"],["dc.bibliographiccitation.volume","13"],["dc.contributor.author","Unakafov, Anton M."],["dc.contributor.author","Möller, Sebastian"],["dc.contributor.author","Kagan, Igor"],["dc.contributor.author","Gail, Alexander"],["dc.contributor.author","Treue, Stefan"],["dc.contributor.author","Wolf, Fred"],["dc.date.accessioned","2019-07-09T11:46:04Z"],["dc.date.available","2019-07-09T11:46:04Z"],["dc.date.issued","2018"],["dc.description.abstract","For humans and for non-human primates heart rate is a reliable indicator of an individual's current physiological state, with applications ranging from health checks to experimental studies of cognitive and emotional state. In humans, changes in the optical properties of the skin tissue correlated with cardiac cycles (imaging photoplethysmogram, iPPG) allow noncontact estimation of heart rate by its proxy, pulse rate. Yet, there is no established simple and non-invasive technique for pulse rate measurements in awake and behaving animals. Using iPPG, we here demonstrate that pulse rate in rhesus monkeys can be accurately estimated from facial videos. We computed iPPGs from eight color facial videos of four awake head-stabilized rhesus monkeys. Pulse rate estimated from iPPGs was in good agreement with reference data from a contact pulse-oximeter: the error of pulse rate estimation was below 5% of the individual average pulse rate in 83% of the epochs; the error was below 10% for 98% of the epochs. We conclude that iPPG allows non-invasive and non-contact estimation of pulse rate in non-human primates, which is useful for physiological studies and can be used toward welfare-assessment of non-human primates in research."],["dc.identifier.doi","10.1371/journal.pone.0202581"],["dc.identifier.pmid","30169537"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/15392"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/59375"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.intern","In goescholar not merged with http://resolver.sub.uni-goettingen.de/purl?gs-1/15694 but duplicate"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.subject.ddc","570"],["dc.title","Using imaging photoplethysmography for heart rate estimation in non-human primates"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.journal","Frontiers in Psychology"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Wilson, Vanessa A. D."],["dc.contributor.author","Kade, Carolin"],["dc.contributor.author","Moeller, Sebastian"],["dc.contributor.author","Treue, Stefan"],["dc.contributor.author","Kagan, Igor"],["dc.contributor.author","Fischer, Julia"],["dc.date.accessioned","2021-04-14T08:23:49Z"],["dc.date.available","2021-04-14T08:23:49Z"],["dc.date.issued","2020"],["dc.description.abstract","Following the expanding use and applications of virtual reality in everyday life, realistic virtual stimuli are of increasing interest in cognitive studies. They allow for control of features such as gaze, expression, appearance, and movement, which may help to overcome limitations of using photographs or video recordings to study social responses. In using virtual stimuli however, one must be careful to avoid the uncanny valley effect, where realistic stimuli can be perceived as eerie, and induce an aversion response. At the same time, it is important to establish whether responses to virtual stimuli mirror responses to depictions of a real conspecific. In the current study, we describe the development of a new virtual monkey head with realistic facial features for experiments with nonhuman primates, the “Primatar.” As a first step toward validation, we assessed how monkeys respond to facial images of a prototype of this Primatar compared to images of real monkeys (RMs), and an unrealistic model. We also compared gaze responses between original images and scrambled as well as obfuscated versions of these images. We measured looking time to images in six freely moving long-tailed macaques (Macaca fascicularis) and gaze exploration behavior in three rhesus macaques (Macaca mulatta). Both groups showed more signs of overt attention to original images than scrambled or obfuscated images. In addition, we found no evidence for an uncanny valley effect; since for both groups, looking times did not differ between real, realistic, or unrealistic images. These results provide important data for further development of our Primatar for use in social cognition studies and more generally for cognitive research with virtual stimuli in nonhuman primates. Future research on the absence of an uncanny valley effect in macaques is needed, to elucidate the roots of this mechanism in humans."],["dc.identifier.doi","10.3389/fpsyg.2020.01645"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/81057"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.publisher","Frontiers Media S.A."],["dc.relation.eissn","1664-1078"],["dc.rights","http://creativecommons.org/licenses/by/4.0/"],["dc.title","Macaque Gaze Responses to the Primatar: A Virtual Macaque Head for Social Cognition Research"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","102076"],["dc.bibliographiccitation.journal","NeuroImage: Clinical"],["dc.bibliographiccitation.volume","25"],["dc.contributor.author","Miloserdov, Kristina"],["dc.contributor.author","Schmidt-Samoa, Carsten"],["dc.contributor.author","Williams, Kathleen"],["dc.contributor.author","Weinrich, Christiane Anne"],["dc.contributor.author","Kagan, Igor"],["dc.contributor.author","Bürk, Katrin"],["dc.contributor.author","Trenkwalder, Claudia"],["dc.contributor.author","Bähr, Mathias"],["dc.contributor.author","Wilke, Melanie"],["dc.date.accessioned","2020-12-10T15:20:31Z"],["dc.date.available","2020-12-10T15:20:31Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1016/j.nicl.2019.102076"],["dc.identifier.issn","2213-1582"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/16784"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/72695"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.notes.intern","Merged from goescholar"],["dc.rights","CC BY-NC-ND 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by-nc-nd/4.0"],["dc.title","Aberrant functional connectivity of resting state networks related to misperceptions and intra-individual variability in Parkinson‘s disease"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]