Zobrazeno 1 - 10
of 17
pro vyhledávání: '"Jennifer Vonk"'
Publikováno v:
Animals, Vol 12, Iss 9, p 1188 (2022)
We adapted the emotional Stroop task developed for primates to test whether gorillas would show response slowing for images of ‘negative’ compared to images of ‘positive’ items placed within previously reinforced borders. Three zoo-housed mal
Externí odkaz:
https://doaj.org/article/6a1c3a80b1a24d0281302f964c388f9e
A Food for All Seasons: Stability of Food Preferences in Gorillas across Testing Methods and Seasons
Publikováno v:
Animals, Vol 12, Iss 6, p 685 (2022)
Decisions about which foods to use during training and enrichment for captive animals may be based on invalid assumptions about individuals’ preferences. It is important to assess the stability of food preferences given that one-time preferences ar
Externí odkaz:
https://doaj.org/article/194c7a276d504597af7f0689c23ce3c0
Publikováno v:
Animal Behavior and Cognition, Vol 4, Iss 1, Pp 91-104 (2017)
In nonhumans, ‘optimism’ is often defined as responding to an ambiguous item in the same manner as to items previously associated with reward (or lack of punishment), and “pessimism” is defined as responding to an ambiguous item in the same m
Externí odkaz:
https://doaj.org/article/d1febc52ded54b7788b2550b8a275a1e
Publikováno v:
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
Externí odkaz:
https://doaj.org/article/5829728c623346388cf9b11a075a4d58
Autor:
Jennifer Vonk
Publikováno v:
PeerJ, Vol 1, p e158 (2013)
Following a series of experiments in which six orangutans and one gorilla discriminated photographs of different animal species in a two-choice touch screen procedure, Vonk & MacDonald (2002) and Vonk & MacDonald (2004) concluded that orangutans, but
Externí odkaz:
https://doaj.org/article/d9a39df0a5224f65814ea2be26f3e0d5
Autor:
Molly C. McGuire, Jennifer Vonk
Publikováno v:
PeerJ, Vol 8, p e9525 (2020)
Background Individuals experiencing negative affect have shown response slowing, a longer latency to respond in relation to baseline, when presented with aversive stimuli. We assessed response slowing in three male gorillas housed in a bachelor group
Autor:
Zoe Johnson-Ulrich, Jennifer Vonk
Publikováno v:
Animal Cognition. 21:531-550
The spatial-numerical association of response codes (SNARC) effect is the tendency for humans to respond faster to relatively larger numbers on the left or right (or with the left or right hand) and faster to relatively smaller numbers on the other s
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
Autor:
Jennifer Vonk, Melissa Thueme, Michael J. Beran, Jennifer Thomas, Lauri Torgerson-White, Molly C. McGuire
Publikováno v:
Animal Cognition. 17:755-765
We investigated the quantity judgment abilities of two adult male western lowland gorillas (Gorilla gorilla gorilla) by presenting discrimination tasks on a touch-screen computer. Both gorillas chose the larger quantity of two arrays of dot stimuli.