All Stories

  1. Too many eyes on the same prize? Why searching together but dividing attention shapes more effective collective foraging.
  2. David A. Washburn (1961–2025).
  3. Does new evidence affect chimpanzees’ beliefs or expectations?
  4. Is it weird in here and does comparative cognition suffer from main-character syndrome?
  5. Ready Player One? Virtual environments as a tool for studying spatial cognition in nonhuman primates.
  6. Will monkeys wager differently as a function of stimulus fluency or when making immediate versus delayed judgements of memory?
  7. One smell, two smells, intermixed, combined, or queued smells: What training procedure promotes the best generalization of odor detection by dogs?
  8. Monkeys overestimate connected arrays in a relative quantity task: A reverse connectedness illusion
  9. Fins, feathers, fingers, and finding an explanation for the puzzle of ephemeral rewards.
  10. For the sake of curiosity: Humans but not capuchins (Sapajus apella) collect counterfactual information on a computerized gambling task
  11. Maze runners: monkeys show restricted Arabic numeral summation during computerized two-arm maze performance
  12. On parrots, delay of gratification, executive function, and how sometimes we do the best we can.
  13. Editorial.
  14. Why do distractions sometimes aid self-control? Pigeons (Columba livia) highlight possible mechanisms underlying the distraction effect.
  15. I am as fooled as you are, say some primates … but only sometimes.
  16. Consistently Inconsistent Perceptual Illusions in Nonhuman Primates: The Importance of Individual Differences
  17. Congratulations to Animal Cognition on its 50th birthday! Some thoughts on the last 50 years of animal cognition research
  18. Primate Cognitive Studies
  19. Assessing the perception of face pareidolia in children (Homo sapiens), rhesus monkeys (Macaca mulatta), and capuchin monkeys (Sapajus apella).
  20. I’ll (not) take that: The reverse-reward contingency task as a test of self-control and inhibition
  21. Children (Homo sapiens), but not rhesus monkeys (Macaca mulatta), perceive the one-is-more illusion.
  22. Michael J. Beran
  23. Proto-counting
  24. The evolution of quantitative sensitivity
  25. Nonhuman primates learn adjacent dependencies but fail to learn nonadjacent dependencies in a statistical learning task with a salient cue
  26. Focality and prospective memory in preschool children
  27. Launch! Self-agency as a discriminative cue for humans (Homo sapiens) and monkeys (Macaca Mulatta).
  28. A chimpanzee recognizes varied acoustical versions of sine-wave and noise-vocoded speech
  29. Non-human primate token use shows possibilities but also limitations for establishing a form of currency
  30. Go if you know: Preschool children’s movements reflect their metacognitive monitoring
  31. Assessing consistency in children’s and monkeys’ performance across computerized and manual detour problem tasks
  32.  
  33. Words matter: Reflections on language projects with chimpanzees and their implications
  34. Capuchin monkeys (sometimes) go when they know: Confidence movements in Sapajus apella
  35. Post-event misinformation effects in a language-trained chimpanzee (Pan troglodytes)
  36. The density bias: Capuchin monkeys (Sapajus apella) prefer densely arranged items in a food-choice task.
  37. Are the roots of human economic systems shared with non-human primates?
  38. Outcome expectancy and suboptimal risky choice in nonhuman primates
  39. Proto-counting
  40. Correction: Establishing an infrastructure for collaboration in primate cognition research
  41. Collaborative open science as a way to reproducibility and new insights in primate cognition research
  42. Collaborative open science as a way to reproducibility and new insights in primate cognition research
  43. Establishing an infrastructure for collaboration in primate cognition research
  44. Correction to: Linear numerosity illusions in capuchin monkeys (Sapajus apella), rhesus macaques (Macaca mulatta), and humans (Homo sapiens)
  45. Divide and Conquer
  46. Linear numerosity illusions in capuchin monkeys (Sapajus apella), rhesus macaques (Macaca mulatta), and humans (Homo sapiens)
  47. Simultaneous versus prospective/retrospective uncertainty monitoring: The effect of response competition across cognitive levels.
  48. Establishing an infrastructure for collaboration in primate cognition research
  49. Exploring the Jastrow Illusion in Humans (Homo sapiens), Rhesus Monkeys (Macaca mulatta), and Capuchin Monkeys (Sapajus apella)
  50. Do monkeys show evidence of mental number line?
  51. All Hail Suboptimal Choice! Now, Can We "Fix" It?
  52. Monkey Memory: Rehearsal Emerges for Novel Images When Familiarity Cues Fade
  53. Working memory in children assessed with serial chaining and Simon tasks
  54. A computerized testing system for primates: Cognition, welfare, and the Rumbaughx
  55. Task switching in rhesus macaques (Macaca mulatta) and tufted capuchin monkeys (Cebus apella) during computerized categorization tasks.
  56. Duane M. Rumbaugh (1929–2017).
  57. An Investigation of Prospective Memory with Output Monitoring in Preschool Children
  58. I scan, therefore I decline: The time course of difficulty monitoring in humans (homo sapiens) and macaques (macaca mulatta).
  59. Chimpanzees show some evidence of selectively acquiring information by using tools, making inferences, and evaluating possible outcomes
  60. Visual artificial grammar learning by rhesus macaques (Macaca mulatta): exploring the role of grammar complexity and sequence length
  61. Exploring the solitaire illusion in guppies (Poecilia reticulata).
  62. Self-Control in Chimpanzees Relates to General Intelligence
  63. Simians in the Shape School: A comparative study of executive attention
  64. Mental Time Travel
  65. Worth Waiting For
  66. Is Self-Control Like a Muscle?
  67. Children’s Delay of Gratification
  68. Human Intertemporal Choices
  69. Delayed Gratification
  70. Varieties of Self-Control
  71. Are Animal Tests of Self-Control All Measuring the Same Thing?
  72. Do Animals Flex Their Own Self-Control “Muscle”?
  73. How Do We Know Whether We Are Measuring Self-Control? Methodological Concerns Lead to a New Test
  74. Intertemporal Choices by Nonhuman Animals
  75. Other Tests of Self-Control and Delay of Gratification in Animals
  76. Self-Control and Social Settings
  77. Self-Control in Animals and People
  78. The Reversed-Reward Contingency Task—Why Pointing Away from What You Want Is So Difficult For Animals
  79. What Is Self-Control and What Is It Good For?
  80. Would Animals Pass a Version of the Marshmallow Test?
  81. Rhesus monkeys (Macaca mulatta) remember agency information from past events and integrate this knowledge with spatial and temporal features in working memory
  82. Dealing with interference: Chimpanzees respond to conflicting cues in a food-choice memory task.
  83. Human and monkey responses in a symmetric game of conflict with asymmetric equilibria
  84. Within-session reversal learning in rhesus macaques (Macaca mulatta)
  85. Gambling in rhesus macaques (Macaca mulatta): The effect of cues signaling risky choice outcomes
  86. Exploring whether nonhuman primates show a bias to overestimate dense quantities.
  87. Michael J. Beran
  88. Addition
  89. Approximate Number System (ANS)
  90. Quantitative cognition.
  91. The number sense is neither last resort nor of primary import
  92. To Err Is (Not Only) Human: Fallibility as a Window Into Primate Cognition
  93. How Illusory Is the Solitaire Illusion? Assessing the Degree of Misperception of Numerosity in Adult Humans
  94. Chimpanzees can point to smaller amounts of food to accumulate larger amounts but they still fail the reverse-reward contingency task.
  95. From “sense of number” to “sense of magnitude”: The role of continuous magnitudes in numerical cognition
  96. Testing the Glucose Hypothesis among Capuchin Monkeys: Does Glucose Boost Self-Control?
  97. Self-control assessments of capuchin monkeys with the rotating tray task and the accumulation task
  98. Primate cognition: attention, episodic memory, prospective memory, self‐control, and metacognition as examples of cognitive control in nonhuman primates
  99. Chimpanzees, cooking, and a more comparative psychology
  100. The elusive illusion: Do children (Homo sapiens) and capuchin monkeys (Cebus apella) see the Solitaire illusion?
  101. Capuchin monkeys (Cebus apella) modulate their use of an uncertainty response depending on risk.
  102. Capuchin monkeys (Cebus apella) treat small and large numbers of items similarly during a relative quantity judgment task
  103. Commentary: A crisis in comparative psychology: where have all the undergraduates gone?
  104. Chimpanzee food preferences, associative learning, and the origins of cooking
  105. “Zeroing” in on mathematics in the monkey brain
  106. Do you see what I see? A comparative investigation of the Delboeuf illusion in humans (Homo sapiens), rhesus monkeys (Macaca mulatta), and capuchin monkeys (Cebus apella).
  107. Animal Memory: Chimpanzees Anticipate What Comes Next in Short Movies
  108. Chimpanzee Cognitive Control
  109. Go when you know: Chimpanzees’ confidence movements reflect their responses in a computerized memory task
  110. Trading up: chimpanzees (Pan troglodytes) show self-control through their exchange behavior
  111. Waiting for what comes later: capuchin monkeys show self-control even for nonvisible delayed rewards
  112. Looking ahead? Computerized maze task performance by chimpanzees (Pan troglodytes), rhesus monkeys (Macaca mulatta), capuchin monkeys (Cebus apella), and human children (Homo sapiens).
  113. Rhesus macaques (Macaca mulatta) exhibit the decoy effect in a perceptual discrimination task
  114. Do rhesus monkeys (Macaca mulatta) perceive illusory motion?
  115. A Longitudinal Assessment of Vocabulary Retention in Symbol-Competent Chimpanzees (Pan troglodytes)
  116. Defining value through quantity and quality—Chimpanzees (Pan troglodytes) undervalue food quantities when items are broken
  117. The comparative science of “self-control”: what are we talking about?
  118. The misbehaviour of a metacognitive monkey
  119. Animal Memory: Rats Bind Event Details into Episodic Memories
  120. The Relationship between Event-Based Prospective Memory and Ongoing Task Performance in Chimpanzees (Pan troglodytes)
  121. Do primates see the solitaire illusion differently? A comparative assessment of humans (Homo sapiens), chimpanzees (Pan troglodytes), rhesus monkeys (Macaca mulatta), and capuchin monkeys (Cebus apella).
  122. Chimpanzees sometimes see fuller as better: Judgments of food quantities based on container size and fullness
  123. Working and waiting for better rewards: Self-control in two monkey species (Cebus apella and Macaca mulatta)
  124. Do monkeys choose to choose?
  125. Do rhesus monkeys (Macaca mulatta) perceive the Zöllner illusion?
  126. A tale of two comparative psychologies: Reply to commentaries.
  127. Animal metacognition: A tale of two comparative psychologies.
  128. Cashing out: The decisional flexibility of uncertainty responses in rhesus macaques (Macaca mulatta) and humans (Homo sapiens).
  129. Delay of gratification by orangutans (Pongo pygmaeus) in the accumulation task.
  130. Relative quantity judgments between discrete spatial arrays by chimpanzees (Pan troglodytes) and New Zealand robins (Petroica longipes).
  131. The uncertainty response in animal-metacognition researchers.
  132. What are my chances? Closing the gap in uncertainty monitoring between rhesus monkeys (Macaca mulatta) and capuchin monkeys (Cebus apella).
  133. The Highs and Lows of Theoretical Interpretation in Animal-Metacognition Research
  134. Fading perceptual resemblance: A path for rhesus macaques (Macaca mulatta) to conceptual matching?
  135. Quantity estimation and comparison in western lowland gorillas (Gorilla gorilla gorilla)
  136. Preface
  137. When less is more: like humans, chimpanzees (Pan troglodytes) misperceive food amounts based on plate size
  138. Prospective memory in children and chimpanzees
  139. Comparative Approaches to Studying Strategy: Towards an Evolutionary Account of Primate Decision Making
  140. Chimpanzees (Pan troglodytes) can wait, when they choose to: a study with the hybrid delay task
  141. Visual nesting of stimuli affects rhesus monkeys’ (Macaca mulatta) quantity judgments in a bisection task
  142. What counts for ‘counting’? Chimpanzees, Pan troglodytes, respond appropriately to relevant and irrelevant information in a quantity judgment task
  143. Language-Trained Chimpanzees ( Pan troglodytes ) Name What They Have Seen but Look First at What They Have Not Seen
  144. The hybrid delay task: Can capuchin monkeys (Cebus apella) sustain a delay after an initial choice to do so?
  145. Chimpanzees (Pan troglodytes) transfer tokens repeatedly with a partner to accumulate rewards in a self-control task
  146. Delay choice versus delay maintenance: Different measures of delayed gratification in capuchin monkeys (Cebus apella).
  147. Executive-attentional uncertainty responses by rhesus macaques (Macaca mulatta).
  148. Learning how to “make a deal”: Human (Homo sapiens) and monkey (Macaca mulatta) performance when repeatedly faced with the Monty Hall Dilemma.
  149. Number without language: comparative psychology and the evolution of numerical cognition
  150. Monkeys exhibit prospective memory in a computerized task
  151. Implicit and explicit categorization: A tale of four species
  152. Prospective memory in a language-trained chimpanzee (Pan troglodytes)
  153. Foundations of Metacognition
  154. Evidence for animal metaminds
  155. On the nature, evolution, development, and epistemology of metacognition: introductory thoughts
  156. Implicit and explicit category learning by capuchin monkeys (Cebus apella).
  157. Sequential responding and planning in capuchin monkeys (Cebus apella)
  158. Bears ‘count’ too: quantity estimation and comparison in black bears, Ursus americanus
  159. Putting the elephant back in the herd: elephant relative quantity judgments match those of other species
  160. Capuchin monkeys (Cebus apella) let lesser rewards pass them by to get better rewards
  161. Language‐Trained Chimpanzees (Pan troglodytes) Delay Gratification by Choosing Token Exchange Over Immediate Reward Consumption
  162. Animal Memory: Rats Can Answer Unexpected Questions about Past Events
  163. The highs and lows of theoretical interpretation in animal-metacognition research
  164. Delaying gratification for food and tokens in capuchin monkeys (Cebus apella) and chimpanzees (Pan troglodytes): when quantity is salient, symbolic stimuli do not improve performance
  165. Animal Metacognition
  166. Metacognition across Species
  167. Humans and monkeys show similar skill in estimating uncertain outcomes
  168. Corrigendum to “Information seeking by rhesus monkeys (Macaca mulatta) and capuchin monkeys (Cebus apella)” [Cognition 120 (2011) 90–105]
  169. Thinking Animals: A Closed Case or an Open Debate?
  170. Did You Ever Hear the One About the Horse that Could Count?
  171. Do Social Conditions Affect Capuchin Monkeys’ (Cebus apella) Choices in a Quantity Judgment Task?
  172. How Is Chimpanzee Self-Control Influenced by Social Setting?
  173. Quantity judgments of auditory and visual stimuli by chimpanzees (Pan troglodytes).
  174. Rhesus monkeys (Macaca mulatta) and capuchin monkeys (Cebus apella) remember future responses in a computerized task.
  175. Uncertainty Monitoring by Young Children in a Computerized Task
  176. A Serial Reaction Time (SRT) task with symmetrical joystick responding for nonhuman primates
  177. Old World monkeys are more similar to humans than New World monkeys when playing a coordination game
  178. Do actions speak louder than words? A comparative perspective on implicit versus explicit meta‐cognition and theory of mind
  179. Comparing children’s Homo sapiens and chimpanzees’ Pan troglodytes quantity judgments of sequentially presented sets of items
  180. Information seeking by rhesus monkeys (Macaca mulatta) and capuchin monkeys (Cebus apella)
  181. A Chimpanzee Recognizes Synthetic Speech with Significantly Reduced Acoustic Cues to Phonetic Content
  182. Chimpanzees (Pan troglodytes) show the isolation effect during serial list recognition memory tests
  183. Responses to the Assurance game in monkeys, apes, and humans using equivalent procedures
  184. An Investigation of Prospective and Retrospective Coding in Capuchin Monkeys and Rhesus Monkeys
  185. Analogical reasoning and the differential outcome effect: Transitory bridging of the conceptual gap for rhesus monkeys (Macaca mulatta).
  186. Monkeys (Macaca Mulatta and Cebus Apella) and Human Adults and Children (Homo Sapiens) Compare Subsets of Moving Stimuli Based on Numerosity
  187. Numerical judgments by chimpanzees (Pan troglodytes) in a token economy.
  188. Postoperative monitoring of non-invasive absolute cerebral oxygen saturation after carotid endarterectomy
  189. Erratum to: Chimpanzees (Pan troglodytes) accurately compare poured liquid quantities
  190. Use of exclusion by a chimpanzee (Pan troglodytes) during speech perception and auditory–visual matching-to-sample
  191. Chimpanzees (Pan troglodytes) accurately compare poured liquid quantities
  192. Beyond stimulus cues and reinforcement signals: A new approach to animal metacognition.
  193. Can nonhuman primates use tokens to represent and sum quantities?
  194. Implicit and explicit category learning by macaques (Macaca mulatta) and humans (Homo sapiens).
  195. Metacognition in Nonhumans: Methodological and Theoretical Issues in Uncertainty Monitoring
  196. What do Arabic numerals mean to macaques (Macaca mulatta)?
  197. With his memory magnetically erased, a monkey knows he is uncertain
  198. Rhesus monkeys (Macaca mulatta) adaptively monitor uncertainty while multi-tasking
  199. Natural choice in chimpanzees (Pan troglodytes): Perceptual and temporal effects on selective value
  200. Metacognition is prior
  201. Delay of gratification by chimpanzees (Pan troglodytes) in working and waiting situations
  202. Animal Metacognition: Problems and Prospects
  203. Memory for “what”, “where”, and “when” information in rhesus monkeys (Macaca mulatta).
  204. Metacognition in Animals
  205. Perception of food amounts by chimpanzees (Pan troglodytes): The role of magnitude, contiguity, and wholeness.
  206. The Curious Incident of the Capuchins
  207. The psychological organization of “uncertainty” responses and “middle” responses: A dissociation in capuchin monkeys (Cebus apella).
  208. Trading behavior between conspecifics in chimpanzees, Pan troglodytes.
  209. When in doubt, chimpanzees rely on estimates of past reward amounts
  210. Quantity judgments of sequentially presented food items by capuchin monkeys (Cebus apella)
  211. The comparative study of metacognition: Sharper paradigms, safer inferences
  212. Quantity representation in children and rhesus monkeys: Linear versus logarithmic scales
  213. Perception of food amounts by chimpanzees based on the number, size, contour length and visibility of items
  214. An efficient computerized testing method for the capuchin monkey (Cebus apella): Adaptation of the LRC-CTS to a socially housed nonhuman primate species
  215. The Evolutionary and Developmental Foundations of Mathematics
  216. Chimpanzee Autarky
  217. Why Some Apes Imitate and/or Emulate Observed Behavior and Others Do Not: Fact, Theory, and Implications for Our Kind
  218. Discrimination Reversal Learning in Capuchin Monkeys (Cebus Apella)
  219. Monkeys (Macaca mulatta and Cebus apella) track, enumerate, and compare multiple sets of moving items.
  220. Ordinal judgments of symbolic stimuli by capuchin monkeys (Cebus apella) and rhesus monkeys (Macaca mulatta): The effects of differential and nondifferential reward.
  221. What meaning means for same and different: Analogical reasoning in humans (Homo sapiens), chimpanzees (Pan troglodytes), and rhesus monkeys (Macaca mulatta).
  222. A Salience Theory of Learning and Behavior: With Perspectives on Neurobiology and Cognition
  223. Chimpanzees use self-distraction to cope with impulsivity
  224. Summation and quantity judgments of sequentially presented sets by capuchin monkeys (Cebus apella)
  225. Capuchin monkeys (Cebus apella) succeed in a test of quantity conservation
  226. A Stroop-Like Effect in Color-Naming of Color-Word Lexigrams by a Chimpanzee (Pan Troglodyte)
  227. Delay of Gratification and Delay Maintenance by Rhesus Macaques (Macaca Mulatta)
  228. Ordinal-List Integration for Symbolic, Arbitrary, and Analog Stimuli by Rhesus Macaques (Macaca Mulatta)
  229. Rhesus monkeys (Macaca mulatta) select Arabic numerals or visual quantities corresponding to a number of sequentially completed maze trials
  230. Disconnect in concept learning by rhesus monkeys (Macaca mulatta): Judgment of relations and relations-between-relations.
  231. Rhesus monkeys (Macaca mulatta) enumerate large and small sequentially presented sets of items using analog numerical representations.
  232. Rhesus Monkeys (Macaca mulatta) Maintain Learning Set Despite Second-Order Stimulus-Response Spatial Discontiguity
  233. Nonverbal Estimation during Numerosity Judgements by Adult Humans
  234. Maintenance of delay of gratification by four chimpanzees (Pan troglodytes): The effects of delayed reward visibility, experimenter presence, and extended delay intervals
  235. Rhesus monkeys (Macaca mulatta) succeed on a computerized test designed to assess conservation of discrete quantity
  236. Dissociating uncertainty responses and reinforcement signals in the comparative study of uncertainty monitoring.
  237. Chimpanzees (Pan troglodytes) remember the location of a hidden food item after altering their orientation to a spatial array.
  238. Rhesus macaques (macaca mulatta) monitor uncertainty during numerosity judgments.
  239. Chimpanzees (Pan troglodytes) use markers to monitor the movement of a hidden item
  240. Ordinal Judgments and Summation of Nonvisible Sets of Food Items by Two Chimpanzees and a Rhesus Macaque.
  241. Spatial Memory and Monitoring of Hidden Items Through Spatial Displacements by Chimpanzees (Pan troglodytes).
  242. Long-term retention of the differential values of Arabic numerals by chimpanzees ( Pan troglodytes )
  243. Chimpanzees Remember the Results of One-by-One Addition of Food Items to Sets Over Extended Time Periods
  244. Chimpanzees (Pan troglodytes) Respond to Nonvisible Sets After One-by-One Addition and Removal of Items.
  245. Sequential Responding and Planning in Chimpanzees (Pan troglodytes) and Rhesus Macaques (Macaca mulatta).
  246. Uncertainty monitoring may promote emergents
  247. CHIMPANZEE RESPONDING DURING MATCHING TO SAMPLE: CONTROL BY EXCLUSION
  248. Maintenance of Self-Imposed Delay of Gratification by Four Chimpanzees (Pan troglodytes) and an Orangutan (Pongo pygmaeus)
  249. Comparative cognitive science and the Japanese influence in primatology
  250. "Constructive" enumeration by chimpanzees ( Pan troglodytes ) on a computerized task
  251. Do Chimpanzees Have Expectations About Reward Presentation Following Correct Performance on Computerized Cognitive Testing?
  252. Summation and numerousness judgments of sequentially presented sets of items by chimpanzees (Pan troglodytes).
  253. Summation and numerousness judgments of sequentially presented sets of items by chimpanzees (Pan troglodytes).
  254. A chimpanzee’s (Pan troglodytes) long-term retention of lexigrams
  255. Predicting hominid intelligence from brain size
  256. Delay of gratification in chimpanzees(Pan troglodytes)
  257. Chimpanzee (Pan Troglodytes) Counting in a Computerized Testing Paradigm
  258. Overall similarity in adults' classification: The child in all of us.