Zobrazeno 1 - 10
of 15
pro vyhledávání: '"Jennifer Vonk"'
Publikováno v:
Zoo Biology. 40:89-97
Judgment bias tasks can reveal changes in affect in animals as a function of environmental manipulations such as provision of enrichment. We assessed affect in an American black bear across seasonal changes in availability of a mulberry bush. We used
Publikováno v:
Journal of Veterinary Behavior. 25:85-91
Changes in the affective state of neglected or abused animals can be difficult to quantify relative to physical improvements following rescue. Judgment bias as a measure of affective state was assessed in 8 horses and 2 donkeys that differed in their
Autor:
Stephanie E. Jett, Jennifer Vonk
Publikováno v:
Animal Behavior and Cognition, Vol 5, Iss 1, Pp 68-78 (2018)
We presented two American black bears (Ursus americanus) with a serial list learning memory task, and one of the bears with a matching-to-sample task. After extended training, both bears demonstrated some success with the memory task but failed to ge
Autor:
Molly C. McGuire, Jennifer Vonk
Publikováno v:
Animal Behavior and Cognition, Vol 5, Iss 1, Pp 103-117 (2018)
In order to assess mood state in three male western lowland gorillas housed in a bachelor group, we developed a novel version of a cognitive bias task. The background color of a touchscreen presented a conditional ‘if, then…” rule relating to o
Publikováno v:
Zoo Biology. 37:23-34
We investigated how forage material affects indicators of welfare in three male Western lowland gorillas (Gorilla gorilla gorilla) at the Detroit Zoo. In addition to their maintenance diet and enrichment foods, the gorillas generally received forage
Publikováno v:
Journal of Comparative Psychology. 131:384-389
The visual acuity of striped skunks (Mephitis mephitis) was tested using a 2 alternative forced-choice task with square wave gratings. Skunks were reinforced with food items for touching a ball in front of a striped stimulus when paired with a ball i
Autor:
Moriah Galvan, Jennifer Vonk
Publikováno v:
Animal Cognition. 19:193-205
The ability of domestic dogs (C. lupus famaliaris) to follow and attend to human emotion expressions is well documented. It is unknown whether domestic cats (F. silvestris catus) possess similar abilities. Because cats belong to the same order (Carni
Publikováno v:
Behavioral Sciences; Volume 7; Issue 3; Pages: 51
Behavioral Sciences
Behavioral Sciences, Vol 7, Iss 3, p 51 (2017)
Behavioral Sciences
Behavioral Sciences, Vol 7, Iss 3, p 51 (2017)
Cognitive bias tests are frequently used to assess affective state in nonhumans. We adapted the ambiguous-cue paradigm to assess affective states and to compare learning of reward associations in two distantly related species, an American black bear
Autor:
Jessica A. Leete, Jennifer Vonk
Publikováno v:
Vonk, Jennifer; & Leete, Jessica A.(2017). Carnivore concepts: Categorization in carnivores “bears” further study. International Journal of Comparative Psychology. Retrieved from: http://www.escholarship.org/uc/item/61363164
Although categorization abilities may serve as the foundation for most other complex cognitive processes, this topic has been grossly understudied in the order Carnivora. However, there are a growing number of studies examining the abilities of bears
Autor:
Eric Hoffmaster, Jennifer Vonk
Publikováno v:
Behavioral Sciences
Behavioral Sciences; Volume 6; Issue 4; Pages: 25
Behavioral Sciences, Vol 6, Iss 4, p 25 (2016)
Behavioral Sciences; Volume 6; Issue 4; Pages: 25
Behavioral Sciences, Vol 6, Iss 4, p 25 (2016)
Once thought to be uniquely human, prosocial behavior has been observed in a number of species, including vampire bats that engage in costly food-sharing. Another social chiropteran, Jamaican fruit bats (Artibeus jamaicensis), have been observed to e