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Visual illusions have been widely used as a tool to study animal visual perception. In many cases, identical experimental procedures were adopted to make highly controlled interspecific comparisons. However, reducing methodological variability may prevent reliable comparisons because a certain methodology could be more suitable for some species than others. This study sought to build on previous work that investigated the perception of the Delboeuf illusion in reptiles. Reptiles were presented with trials composed of 2 different-sized food portions on 2 identical plates in which they were expected to maximize their food intake. In contrast to the bearded dragons (Pogona vitticeps), tortoises (Chelonoidis carbonaria) performed poorly in all conditions and therefore no firm conclusion regarding their perception of the illusion could be made. [https://www.selleckchem.com/ selleck chemicals llc] Such results could be due to cognitive challenges or due to the experimental setup, because descending a ramp is demanding for the tortoises. In this study, we adopted the same experimental paradigm but in a flat apparatus. Tortoises significantly discriminated the larger food portions in baseline trials, however, their performance did not differ from chance in illusory trials revealing that, under these conditions, they are not sensitive to the Delboeuf illusion. This nonperception could be ascribed to different factors, such as poorer discrimination ability or a low sensitivity to contrast and assimilation phenomena. Our study highlights the importance of additional investigation to better understand the nature of null results, taking in consideration the ecological needs of the species before drawing any conclusions about its abilities. (PsycInfo Database Record (c) 2020 APA, all rights reserved).Auditory continuity illusions are perceptual illusions in which receivers perceive an auditory signal as continuous when part of the signal has been removed or obfuscated by a louder noise. Richardson's ground squirrels (Urocitellus richardsonii) communicate alarm acoustically in noisy natural settings. Thus, we tested whether they experience an auditory continuity illusion by presenting free-living squirrels with repeated whistle alarm calls within which every second syllable remained unmanipulated, was partially obfuscated by relatively brief (25 ms) bursts of white noise, or partially obfuscated by longer duration (100 ms) white noise bursts. Field playbacks of alarm calls with brief white noise bursts failed to elicit increased vigilance from receivers relative to unmanipulated calls, whereas calls with longer white noise bursts elicited increased vigilance relative to the other 2 call types. As with previous empirical demonstrations of the auditory continuity illusion in vertebrates, relatively short obfuscating noise resulted in receivers perceiving each syllable as a whole, while longer obfuscating noise caused receivers to perceive the beginning and end of each manipulated syllable as 2 distinct syllables, increasing the perceived syllable repetition rate. These results reveal that Richardson's ground squirrels experience an auditory continuity illusion allowing the extraction of the rate of syllable repetition from conspecific repeated alarm calls in the face of short duration environmental noise. Selection has acted upon receivers to refine the cognitive mechanisms underlying signal perception, facilitating the extraction of information masked by environmental noise. (PsycInfo Database Record (c) 2020 APA, all rights reserved).The definition of episodic memory, as proposed by Tulving, includes a requirement of conscious recall. As we are unable to assess this aspect of memory in nonhuman animals, many researchers have referred to demonstrations of what would otherwise be considered episodic memory as "episodic-like memory." Here the definition of episodic memory is reconsidered based on objective criteria. While the primary focus of this reevaluation is based on work with nonhuman animals, considerations are also drawn from converging evidence from cognitive psychology, neuropsychology, and cognitive neuroscience. Implications of this rethinking are discussed, as well as considerations of familiarity, indirect measures of memory, and generally what should be viewed as necessary for episodic memory. This perspective is intended to begin an iterative process within the field to redefine the meaning of episodic memory and to ultimately establish a consensus view. (PsycInfo Database Record (c) 2020 APA, all rights reserved).The scientific study of animal cognition has roots in both experimental psychology and evolutionary biology, with researchers often working in related disciplines such as neuroscience, computing science, or ecology. The interdisciplinary nature of the endeavor is both a strength and a challenge for the field. We begin this review with a brief history of comparative cognition and cognitive ecology, focusing on cognitive processes as a mechanistic link between ethology and behaviorism. We then present a "snapshot" of modern-day undergraduate courses in Canada, the United States of America, and the United Kingdom that focus on animal cognition, highlighting the various course names and host departments. We emphasize the value of keeping (or adding) this subject material within curricula, either as independent courses or as enhanced material in other courses. We also present pedagogical approaches to teaching animal cognition that include techniques in large lecture-based courses and in smaller courses that emphasize hands-on experiential learning. (PsycInfo Database Record (c) 2020 APA, all rights reserved).There are some historical divisions in methods, rationales, and purposes between studies on comparative cognition and behavioural ecology. In turn, the interaction between these two branches and studies from mathematics, computation, and neuroscience is not usual. In this short piece, we attempt to build bridges among these disciplines. We present a series of interconnected vignettes meant to illustrate what a more interdisciplinary approach looks like when successful, and its advantages. Concretely, we focus on a recent topic, namely animal rhythms in interaction, studied under different approaches. We showcase 5 research efforts, which we believe successfully link 5 particular scientific areas of rhythm research conceptualised as the following social neuroscience, detailed rhythmic quantification, ontogeny, computational approaches, and spontaneous interactions. Our suggestions will hopefully spur a "comparative rhythms in interaction" field, which can integrate and capitalize on knowledge from zoology, comparative psychology, neuroscience, and computation.