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1,096 results
  • Volitional control of vocalizations in corvid songbirds. [Journal Article]
    PLoS Biol 2019; 17(8):e3000375Brecht KF, Hage SR, … Nieder A
  • Songbirds are renowned for their acoustically elaborate songs. However, it is unclear whether songbirds can cognitively control their vocal output. Here, we show that crows, songbirds of the corvid family, can be trained to exert control over their vocalizations. In a detection task, three male carrion crows rapidly learned to emit vocalizations in response to a visual cue with no inherent meanin…
  • New Caledonian Crows Behave Optimistically after Using Tools. [Journal Article]
    Curr Biol 2019; 29(16):2737-2742.e3McCoy DE, Schiestl M, … Taylor AH
  • Are complex, species-specific behaviors in animals reinforced by material reward alone or do they also induce positive emotions? Many adaptive human behaviors are intrinsically motivated: they not only improve our material outcomes, but improve our affect as well [1-8]. Work to date on animal optimism, as an indicator of positive affect, has generally focused on how animals react to change in the…
  • Neuronal Correlates of Spatial Working Memory in the Endbrain of Crows. [Journal Article]
    Curr Biol 2019; 29(16):2616-2624.e4Rinnert P, Kirschhock ME, Nieder A
  • Birds are renowned for their excellent spatial cognition. Corvid songbirds, in particular, rely on explicit representation of spatial cues in memory when caching food and retrieving caches for later consumption. However, the neuronal correlates of flexible spatial memory abilities are largely unknown in birds. We therefore trained carrion crows (Corvus corone) on a spatial delayed-response task i…
    Retin Cases Brief Rep 2019Whist E, Symes RJ, … McCluskey PJ
  • CONCLUSIONS: We report the largest case series to date of patients with uveitis secondary to drug treatment for malignant melanoma. These cases are likely to increase in number in the future as newer immunomodulatory therapies for cancers are developed and the indications for these drugs increase. A dilemma arises when patients respond well to these drugs but develop vision-threatening side effects.
  • Sticks and stones: Associative learning alone? [Journal Article]
    Learn Behav 2019Vonk J
  • Gruber et al. (Current Biology, 29, 686-692, 2019) report that New Caledonian crows engage in mental representation to solve a problem involving a tool. Although the crows' success is impressive, an associative account of their behavior calls into question the extent to which the data reflect representation of future states.
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