Perspective-taking

Perspective-taking is the act of perceiving a situation or understanding a concept from an alternative point of view, such as that of another individual.[1] There is a vast amount of scientific literature that has looked at perspective-taking and suggests that it is crucial to human development,[2] and that it may lead to a variety of beneficial outcomes.[3][4] Perspective-taking is related to other theories and concepts including theory of mind[5] and empathy.[6] Both theory and research have suggested ages when children are able to begin to perspective-take and how that ability develops over time.[2][7] Research has also suggested that there may be deficits in people with attention deficit hyperactivity disorder[8] and autism[9] on the ability of individuals to engage in perspective-taking. Additionally, studies have been conducted to assess the brain regions involved in perspective-taking. These studies suggest that several regions may be involved, including the prefrontal cortex and the precuneus.[10] Additionally, studies suggest that perspective-taking may be possible in some non-human animals.[11]

Definition

Perspective-taking is the process by which an individual views a situation from another's point-of-view.[1][12] Within the scientific literature, perspective-taking has been defined along two dimensions: perceptual and conceptual.[13] Perceptual perspective-taking is defined as the ability to understand how another person experiences things through their senses (i.e. visually or auditorily).[13] Most of this literature has focused on visual perspective-taking: the ability to understand the way another person sees things in physical space.[7] Conceptual perspective-taking is defined as the ability to comprehend and take on the viewpoint of another person's psychological experience (i.e. thoughts, feelings and attitudes).[13] For instance, one can visualize the viewpoint of a taller individual (perceptual/visual) or reflect upon another's point of view on a particular concept (conceptual).

Theory of mind

Theory of mind is the awareness that people have individual psychological states that differ from one another.[14] Within perspective-taking literature, the term perspective-taking and theory of mind are sometimes used interchangeably and some studies use theory of mind tasks in order to test if someone is engaging in perspective-taking.[15] Some research, however, has highlighted that the two concepts are related but different, with theory of mind being the recognition that another person has different thoughts and feelings and perspective-taking being the ability to take on that other person's point of view.[5]

Empathy

Empathy has been defined as the ability for someone to share the same emotions another person is having.[16] Empathy and perspective-taking have been studied together in a variety of ways. Within the scientific literature, there are not always clear lines of distinction between empathy and perspective-taking, and the two concepts are often studied in conjunction with one another and viewed as related and similar concepts. Some research has distinguished the two concepts and pointed out their differences,[1] while other literature has theorized that perspective-taking is one component of empathy.[6][17]

In development

Visual
Architecture students draw a ball and scaffolding. Everyone sees its shapes from a different perspective

Previous studies have assessed the age at which humans are capable of visual perspective-taking. Various studies within the literature have drawn different conclusions.

In 1956, Jean Piaget and Bärbel Inhelder conducted a study to assess the visual perspective-taking abilities of young children which has come to be known as the three mountain problem.[2] This study found that by the ages of 9-10, children were able to successfully complete the three mountain problem and seemed able to understand that when someone is standing in a different location (i.e. on a different mountain top) they would have a different view. However, children ages 8 and under struggled with this task.[2]

Since this classic study, a number of studies have suggested that visual perspective-taking may be possible earlier than the age of 9.[18][19] For example, a study that used a different method to assess visual perspective-taking suggested that children may be able to successfully visually perspective-take by the age of 4.5 years old.[18] In this study, 4.5-year-old children were able to understand that someone sitting closer to a picture would have a better view of that picture. However, these researchers found that children who were 3 and 3.5 years old struggled with this task which led them to conclude that the age range of 3 to 4.5 years old could be crucial in perspective-taking development.[18]

Additionally, developmental psychologist John H. Flavell suggested that there are two levels of visual perspective-taking that emerge as children develop.[7] Level 1 perspective-taking is defined as the ability to understand that someone else may see things differently and what another person can see in physical space.[7] For example, one could understand that while an object may be obstructing their own view, from where another person is standing they can see a cat in the room. Level 2 perspective-taking, however, is defined as the understanding that another person can see things differently in physical space and how those objects are organized from that other person's point of view.[7] For example, a person can understand that from another person's point of view they can see a dog to the right but from their own point of view the dog is to the left.

Studies have since been done to examine when children are able to demonstrate level 1 and level 2 perspective-taking. These studies have shown that children at 24 months old[20] and 14 months old[21] may be able to engage in level 1 perspective-taking. Research also suggests that children can engage in level 2 perspective-taking as early as 2.5 years old.[22]

Studies have also suggested that visual perspective-taking ability improves from childhood to adulthood.[23] For example, in comparing 6-year-olds, 8-year-olds, 10-year-olds and adults (averaging at 19 years of age) researchers found that as people's age increased, visual perspective-taking tasks could be done with more accuracy and speed.[24]

Conceptual

In Piaget's theory of cognitive development, he suggests that perspective-taking begins in the concrete operational stage (third stage) which ranges from ages 7–12.[25] It is within this stage that the idea of decentration is introduced as a cognitive ability. Decentration was defined as the ability to take into account the way others perceive various aspects of a given situation.[25]

Another developmental perspective-taking theory was created by Robert L. Selman and entitled social perspective-taking theory (also known as Role-taking theory). This theory suggests that there are five developmental stages involved in perspective-taking ranging from ages 3–6 (characterized by egocentrism or an inability to think of things from another's point of view) to teenagers and adults (where people can understand another person's point of view and this understanding is informed by recognizing another person's environment and culture).[26] The theory suggests that as humans age from childhood to adulthood their ability to perspective-take improves. Studies by Selman and colleagues suggest that children are able to perspective-take in different ways at different ages.[27]

Other studies assess that children can begin to take on the viewpoint of another person considering their feelings, thoughts and attitudes as 4-years-olds.[13][28]

Brain regions

Visual

Visual perspective-taking studies that focus on brain regions are generally performed by collecting functional magnetic resonance imaging (fMRI) data while participants perform perspective-taking tasks. For example, a participant may be shown a picture of another person with objects around them and asked to take on the viewpoint of that person and indicate the number of objects they see (Level 1 visual perspective-taking) and if the objects are located to the right or left of the other person (level 2 visual perspective-taking).[10] While the participant is completing this task they are also having an fMRI scan.

A meta-analysis that looked at existing fMRI research on visual perspective-taking as of 2013 suggested that several areas of the brain have clustered activation during these perspective-taking tasks. These areas included the left prefrontal cortex, the precuneus, and the left cerebellum.[10] Studies suggest these areas of the brain are involved in decision making,[29] visual imagery,[30] and attention[31] respectively.

Conceptual

Research assessing the brain regions involved in conceptual perspective-taking also suggests that multiple brain areas are potentially involved. Studies have been conducted by administering a positron emission tomography (PET) scan and asking participants to engage in perspective-taking tasks. For example, in one study, participants who were all medical students were asked to consider the knowledge base someone who was not in the medical field would have on a list of medical questions.[32]

Studies have suggested that regions that are activated during cognitive perspective-taking include the right parietal lobe and the posterior cingulate cortex among others.[32][33] The literature also points out that some areas seem to be involved both when people imagine themselves and when they imagine the perspective of others. For example, when participants were asked to imagine themselves engaging in an activity versus imagining another person engaging in that activity the precuneus and the supplementary motor area (SMA) were activated, suggesting visual imagery and motor movement thoughts were involved in both tasks.[33]

Deficits

Attention deficit hyperactivity disorder (ADHD)

Research has highlighted that it may be more difficult for children with attention deficit hyperactivity disorder (ADHD) to perspective-take. ADHD research has shown that children with this diagnosis have shown impairments in attention and communication.[8] Perspective-taking research has found that children with ADHD have a harder time taking on the viewpoint of others than children who do not have ADHD.[34]

Autism

There is evidence to suggest that children with autism may be able to engage in visual perspective-taking but may have difficulty engaging in conceptual perspective-taking.[35] For example, a study that compared perspective-taking scores in children who had been diagnosed with autism as compared to children who did not have this diagnosis found no significant difference in scores on level 1 and level 2 visual perspective-taking. However, the study found it was much harder for autistic children to engage in conceptual perspective-taking tasks.[9]

Some studies have been done to explore potential interventions that could help improve perspective-taking abilities in children with autism. These studies suggested that the use of video may be helpful in teaching perspective-taking skills in children with autism.[36][15] For example, an intervention study with autistic children, found that showing the children a video of someone engaging in perspective-taking tasks and explaining their actions led to improved perspective-taking ability.[15]

Outcomes

An abundance of literature has linked perspective-taking abilities with other behaviors. Much of this literature specifically focuses on conceptual perspective-taking (or taking on the viewpoint of another person's thoughts, feelings and attitudes).[13]

Benefit

Visualizing a situation from another person's point of view (conceptual perspective-taking) gives one the ability to better understand the reason behind that person's actions. This also aids in a way to engage in social conversations at different levels in a more acceptable and friendly way.

Empathy

Many studies have associated perspective-taking with empathy. Psychologist Mark Davis suggested that empathy consists of multiple dimensions. To assess this, Davis developed the Interpersonal Reactivity Index (IRI).[6] The IRI consists of four subscales: fantasy, empathic concern, personal distress, and perspective-taking. The perspective-taking subscale asks participants to report how likely they are to engage in trying to see things from another person's point of view.[6] Studies using this widely cited measure have found that perspective-taking is associated with many prosocial behaviors. One study, which assessed cross-cultural data in 63 countries using the IRI, concluded that perspective-taking and empathic concern was associated with volunteerism and agreeableness as well as self-esteem and life satisfaction.[37]

Additionally, research has suggested that perspective-taking leads to empathic concern.[38] This research further suggests that in looking at perspective-taking and empathy it is important to distinguish between two different types of perspective-taking. The research posits that there is a difference between thinking of how one would act, feel and behave if placed in someone else's situation and thinking of the way that another person thinks, feels, and behaves in their own situation.[38] The results of this research reveals that thinking of how another person behaves and feels in their own situation leads to feelings of empathy. However, thinking of how one would behave in another person's situation leads to feelings of empathy as well as distress.[38]

Research has also found that in interactions involving negotiations, taking on the perspective of another person and empathizing with them may have differential outcomes. One study found that people who engaged in perspective-taking were more effective in making a deal with another person and finding innovative agreements that satisfied both parties as compared to those who empathized with someone else.[1]

Sympathy and caring

Research has revealed that perspective-taking was associated with sympathy toward others and prosocial behavior in children as young as 18 months old.[39] Another study looking at sibling interactions found that toddlers who were older siblings were more likely to help take care of their younger siblings when they demonstrated higher perspective-taking abilities.[40]

Creativity

Perspective-taking has also been associated with creativity. For example, perspective-taking has been found to increase the amount of creative ideas generated in team activities.[41] Another study suggested that perspective-taking could lead to more creative and innovative ideas particularly in participants who were internally driven to complete a task.[4]

Bias and stereotype reduction

Many studies within perspective-taking literature have focused on the potential effects of perspective-taking on the perceptions of outgroup members and have found that there are many potential benefits to perspective-taking. Literature on perspective-taking and bias and stereotyping is generally done by asking participants to take the perspective of another person who is different from them in certain domains (i.e. asking young adult participants to take on the perspective of an elderly person or asking White participants to take on the perspective of a Black person as seen in a photograph or video).[3] These studies have shown that perspective-taking can lead to reduced stereotyping of outgroup members,[42] improved attitudes towards others,[43] and increased helping behavior of outgroup members. Research also suggests that perspective-taking can lead to a reduction of in-group favoritism.[42] Additionally, research that focused on implicit (or unconscious) biases found that perspective-taking can lead to reduced implicit bias scores (as measured by the Implicit-association test) as well as more recognition of subtle discrimination.[3]

In disagreements

Research has looked at the potential differences that could arise when one is having a conversation with another person whom they agree with versus having a conversation with someone with whom they disagree. This research found that participants who interacted with people with whom they disagreed had enhanced perspective-taking ability and could better remember the conversation.[44]

Drawbacks

Some researchers have suggested that there may be some drawbacks to perspective-taking. For example, studies have found that asking people to engage in perspective-taking tasks can lead to increased stereotyping of the target if the target is deemed as having more stereotypic qualities[45] and adopting stereotypic behaviors of outgroup members.[46]

Other animals

Although studies have been done to assess if nonhuman animals are able to successfully engage in perspective-taking the literature has not drawn consistent conclusions. Many of these studies assess perspective-taking by training animals on specific tasks or by measuring the consistency of animals to follow the eye gaze of humans. Researchers highlight that being able to successful follow another's eye gaze could indicate that the animal is aware that the human is seeing and paying attention to something that is different from what they see.[47]

One study that assessed the perspective-taking abilities in spider monkeys and capuchin monkeys found that these primates successfully performed eye gazing tasks which led researchers to conclude that the monkeys demonstrated some ability to consider another person's viewpoint.[47] However, another study that utilized an eye gazing method in assessing perspective-taking found that Rhesus monkeys were unsuccessful at eye gazing tasks.[48]

Other studies suggest that dogs have complex social understanding.[49] One study assessed the potential for perspective-taking in dogs by telling a dog that they were not allowed to eat a treat and then placing the food in a location that the dog could reach.[11] These researchers found that dogs were more likely to eat the treat after being instructed not to if there was a barrier that hid the dog from the instructor. Additionally, dogs were less likely to eat the treat if the barrier was of smaller size or had a window in it. However, this study also showed that dogs struggled in other tasks that focused on the dog's own visual attention. These researchers suggest that this study provides evidence that dogs may be aware of other's visual perspectives.[11]

See also

References
  1. Galinsky AD, Maddux WW, Gilin D, White JB (April 2008). "Why it pays to get inside the head of your opponent: the differential effects of perspective taking and empathy in negotiations". Psychological Science. 19 (4): 378–84. doi:10.1111/j.1467-9280.2008.02096.x. PMID 18399891.
  2. PiagetJ, Inhelder B, Langdon FJ, Lunzer JL (1967). The child's conception of space. New York. ISBN 978-0393004083. OCLC 444733.
  3. Todd AR, Bodenhausen GV, Richeson JA, Galinsky AD (June 2011). "Perspective taking combats automatic expressions of racial bias". Journal of Personality and Social Psychology. 100 (6): 1027–42. CiteSeerX 10.1.1.470.8388. doi:10.1037/a0022308. PMID 21381852.
  4. Grant AM, Berry JW (2011). "The Necessity of Others is the Mother of Invention: Intrinsic and Prosocial Motivations, Perspective Taking, and Creativity". The Academy of Management Journal. 54 (1): 73–96. doi:10.5465/amj.2011.59215085. JSTOR 29780276.
  5. Harwood MD, Farrar MJ (2006-06-01). "Conflicting emotions: The connection between affective perspective taking and theory of mind". British Journal of Developmental Psychology. 24 (2): 401–418. doi:10.1348/026151005X50302. ISSN 2044-835X.
  6. Davis MH (1983). "Measuring individual differences in empathy: Evidence for a multidimensional approach". Journal of Personality and Social Psychology. 44 (1): 113–126. doi:10.1037/0022-3514.44.1.113.
  7. Flavell JH (1977). "The development of knowledge about visual perception". Nebraska Symposium on Motivation. Nebraska Symposium on Motivation. 25: 43–76. PMID 753993.
  8. Nilsen ES, Fecica AM (2011-03-01). "A model of communicative perspective-taking for typical and atypical populations of children". Developmental Review. 31 (1): 55–78. doi:10.1016/j.dr.2011.07.001.
  9. Reed T, Peterson C (December 1990). "A comparative study of autistic subjects' performance at two levels of visual and cognitive perspective taking". Journal of Autism and Developmental Disorders. 20 (4): 555–67. doi:10.1007/BF02216060. PMID 2279973.
  10. Schurz M, Aichhorn M, Martin A, Perner J (2013). "Common brain areas engaged in false belief reasoning and visual perspective taking: a meta-analysis of functional brain imaging studies". Frontiers in Human Neuroscience. 7: 712. doi:10.3389/fnhum.2013.00712. PMC 3814428. PMID 24198773.
  11. Bräuer J, Call J, Tomasello M (2004). "Visual perspective taking in dogs (Canis familiaris) in the presence of barriers". Applied Animal Behaviour Science. 88 (3–4): 299–317. doi:10.1016/j.applanim.2004.03.004.
  12. Gerace A, Day A, Casey S, Mohr P (2013). "An exploratory investigation of the process of perspective taking in interpersonal situations". Journal of Relationships Research. 4: e6, 1–12. doi:10.1017/jrr.2013.6.
  13. Marvin RS, Greenberg MT, Mossler DG (1976). "The Early Development of Conceptual Perspective Taking: Distinguishing among Multiple Perspectives". Child Development. 47 (2): 511–514. doi:10.2307/1128810. JSTOR 1128810.
  14. Korkmaz B (2011-05-01). "Theory of Mind and Neurodevelopmental Disorders of Childhood". Pediatric Research. doi:10.1203/PDR.0b013e318212c177. Retrieved 2017-11-25.
  15. Charlop-Christy MH, Daneshvar S (2003). "Using Video Modeling to Teach Perspective Taking to Children with Autism". Journal of Positive Behavior Interventions. 5 (1): 12–21. doi:10.1177/10983007030050010101.
  16. Bryant BK (1982). "An Index of Empathy for Children and Adolescents". Child Development. 53 (2): 413–425. doi:10.2307/1128984. JSTOR 1128984.
  17. Radzvilavicius AL, Stewart AJ, Plotkin JB (April 2019). "Evolution of empathetic moral evaluation". eLife. 8: e44269. doi:10.7554/eLife.44269. PMC 6488294. PMID 30964002.
  18. Flavell JH, Flavell EF, Green FL, Wilcox SA (1980). "Young children's knowledge about visual perception: Effect of observer's distance from target on perceptual clarity of target". Developmental Psychology. 16 (1): 10–12. doi:10.1037/0012-1649.16.1.10.
  19. Newcombe N, Huttenlocher J (1992). "Children's early ability to solve perspective-taking problems". Developmental Psychology. 28 (4): 635–643. doi:10.1037/0012-1649.28.4.635.
  20. Moll H, Tomasello M (2006-09-01). "Level 1 perspective-taking at 24 months of age". British Journal of Developmental Psychology. 24 (3): 603–613. doi:10.1348/026151005x55370. ISSN 2044-835X.
  21. Sodian B, Thoermer C, Metz U (March 2007). "Now I see it but you don't: 14-month-olds can represent another person's visual perspective". Developmental Science. 10 (2): 199–204. doi:10.1111/j.1467-7687.2007.00580.x. PMID 17286844.
  22. Moll H, Meltzoff AN (2011-03-01). "How does it look? Level 2 perspective-taking at 36 months of age". Child Development. 82 (2): 661–73. CiteSeerX 10.1.1.385.1451. doi:10.1111/j.1467-8624.2010.01571.x. PMID 21410927.
  23. Surtees AD, Apperly IA (2012-03-01). "Egocentrism and automatic perspective taking in children and adults". Child Development. 83 (2): 452–60. CiteSeerX 10.1.1.1019.1497. doi:10.1111/j.1467-8624.2011.01730.x. PMID 22335247.
  24. Gzesh SM, Surber CF (1985). "Visual Perspective-Taking Skills in Children". Child Development. 56 (5): 1204–1213. doi:10.2307/1130235. JSTOR 1130235.
  25. Piaget J (2001). The psychology of intelligence. London: Routledge. ISBN 9780415254014. OCLC 46944889.
  26. Selman RL (1971). "Taking Another's Perspective: Role-Taking Development in Early Childhood". Child Development. 42 (6): 1721–1734. doi:10.2307/1127580. JSTOR 1127580.
  27. Selman RL, Byrne DF (1974). "A Structural-Developmental Analysis of Levels of Role Taking in Middle Childhood". Child Development. 45 (3): 803–806. doi:10.2307/1127850. JSTOR 1127850.
  28. Mossler DG, Marvin RS, Greenberg MT (1976). "Conceptual perspective taking in 2- to 6-year-old children". Developmental Psychology. 12 (1): 85–86. doi:10.1037/0012-1649.12.1.85.
  29. Barraclough DJ, Conroy ML, Lee D (April 2004). "Prefrontal cortex and decision making in a mixed-strategy game". Nature Neuroscience. 7 (4): 404–10. doi:10.1038/nn1209. PMID 15004564.
  30. Cavanna AE, Trimble MR (March 2006). "The precuneus: a review of its functional anatomy and behavioural correlates". Brain. 129 (Pt 3): 564–83. doi:10.1093/brain/awl004. PMID 16399806.
  31. Gottwald B, Mihajlovic Z, Wilde B, Mehdorn HM (2003-01-01). "Does the cerebellum contribute to specific aspects of attention?". Neuropsychologia. 41 (11): 1452–60. doi:10.1016/S0028-3932(03)00090-3. PMID 12849763.
  32. Ruby P, Decety J (June 2003). "What you believe versus what you think they believe: a neuroimaging study of conceptual perspective-taking". The European Journal of Neuroscience. 17 (11): 2475–80. doi:10.1046/j.1460-9568.2003.02673.x. PMID 12814380.
  33. Ruby P, Decety J (May 2001). "Effect of subjective perspective taking during simulation of action: a PET investigation of agency". Nature Neuroscience. 4 (5): 546–50. doi:10.1038/87510. PMID 11319565.
  34. Marton I, Wiener J, Rogers M, Moore C, Tannock R (January 2009). "Empathy and social perspective taking in children with Attention-Deficit/Hyperactivity Disorder". Journal of Abnormal Child Psychology. 37 (1): 107–18. doi:10.1007/s10802-008-9262-4. PMID 18712471.
  35. Baron-Cohen S (September 1988). "Social and pragmatic deficits in autism: cognitive or affective?". Journal of Autism and Developmental Disorders. 18 (3): 379–402. doi:10.1007/bf02212194. PMID 3049519.
  36. LeBlanc LA, Coates AM, Daneshvar S, Charlop-Christy MH, Morris C, Lancaster BM (2003). "Using video modeling and reinforcement to teach perspective-taking skills to children with autism". Journal of Applied Behavior Analysis. 36 (2): 253–7. doi:10.1901/jaba.2003.36-253. PMC 1284438. PMID 12858990.
  37. Chopik WJ, O'Brien E, Konrath SH (2017-01-01). "Differences in Empathic Concern and Perspective Taking Across 63 Countries". Journal of Cross-Cultural Psychology. 48 (1): 23–38. doi:10.1177/0022022116673910. hdl:1805/14139. ISSN 0022-0221.
  38. Batson CD, Early S, Salvarani G (2016-07-02). "Perspective Taking: Imagining How Another Feels Versus Imaging How You Would Feel". Personality and Social Psychology Bulletin. 23 (7): 751–758. doi:10.1177/0146167297237008.
  39. Vaish A, Carpenter M, Tomasello M (March 2009). "Sympathy through affective perspective taking and its relation to prosocial behavior in toddlers". Developmental Psychology. 45 (2): 534–43. CiteSeerX 10.1.1.215.3105. doi:10.1037/a0014322. PMID 19271837.
  40. Stewart RB, Marvin RS (1984). "Sibling Relations: The Role of Conceptual Perspective-Taking in the Ontogeny of Sibling Caregiving". Child Development. 55 (4): 1322–1332. doi:10.2307/1130002. JSTOR 1130002.
  41. Hoever IJ, van Knippenberg D, van Ginkel WP, Barkema HG (September 2012). "Fostering team creativity: perspective taking as key to unlocking diversity's potential". The Journal of Applied Psychology. 97 (5): 982–96. doi:10.1037/a0029159. PMID 22774764.
  42. Galinsky AD, Moskowitz GB (2000). "Perspective-taking: Decreasing stereotype expression, stereotype accessibility, and in-group favoritism". Journal of Personality and Social Psychology. 78 (4): 708–724. doi:10.1037/0022-3514.78.4.708.
  43. Vescio TK, Sechrist GB, Paolucci MP (2003-07-01). "Perspective taking and prejudice reduction: the mediational role of empathy arousal and situational attributions". European Journal of Social Psychology. 33 (4): 455–472. doi:10.1002/ejsp.163. ISSN 1099-0992.
  44. Tjosvold D, Johnson DW (1977). "Effects of controversy on cognitive perspective taking". Journal of Educational Psychology. 69 (6): 679–685. doi:10.1037/0022-0663.69.6.679.
  45. Skorinko JL, Sinclair S, Conklin L (2012-04-01). "Perspective Taking Shapes the Impact of Significant-other Representations". Self and Identity. 11 (2): 170–184. doi:10.1080/15298868.2010.517986. ISSN 1529-8868.
  46. Galinsky AD, Wang CS, Ku G (August 2008). "Perspective-takers behave more stereotypically". Journal of Personality and Social Psychology. 95 (2): 404–19. doi:10.1037/0022-3514.95.2.404. PMID 18665710.
  47. Amici F, Aureli F, Visalberghi E, Call J (November 2009). "Spider monkeys (Ateles geoffroyi) and capuchin monkeys (Cebus apella) follow gaze around barriers: evidence for perspective taking?". Journal of Comparative Psychology. 123 (4): 368–74. doi:10.1037/a0017079. PMID 19929105.
  48. Anderson JR, Montant M, Schmitt D (August 1996). "Rhesus monkeys fail to use gaze direction as an experimenter-given cue in an object-choice task". Behavioural Processes. 37 (1): 47–55. doi:10.1016/0376-6357(95)00074-7. PMID 24897158.
  49. Agnetta B, Hare B, Tomasello M (2000-12-01). "Cues to food location that domestic dogs (Canis familiaris) of different ages do and do not use". Animal Cognition. 3 (2): 107–112. doi:10.1007/s100710000070. ISSN 1435-9448.
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