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. 2012 Jul 1;84(1):231-238.
doi: 10.1016/j.anbehav.2012.05.001.

Bears "Count" Too: Quantity Estimation and Comparison in Black Bears (Ursus Americanus)

Affiliations

Affiliation

  • 1 Corresponding Author, Department of Psychology, Oakland University, 2200 N Squirrel Rd, Rochester MI, 48309.

Bears "Count" Too: Quantity Estimation and Comparison in Black Bears (Ursus Americanus)

Jennifer Vonk et al. Anim Behav. .
. 2012 Jul 1;84(1):231-238.
doi: 10.1016/j.anbehav.2012.05.001.

Affiliation

  • 1 Corresponding Author, Department of Psychology, Oakland University, 2200 N Squirrel Rd, Rochester MI, 48309.

Abstract

Studies of bear cognition are notably missing from the comparative record despite bears' large relative brain size and interesting status as generalist carnivores facing complex foraging challenges, but lacking complex social structures. We investigated the numerical abilities of three American black bears (Ursus Americanus) by presenting discrimination tasks on a touch-screen computer. One bear chose the larger of two arrays of dot stimuli, while two bears chose the smaller array of dots. On some trials the relative number of dots was congruent with the relative total area of the two arrays. On other trials number of dots was incongruent with area. All of the bears were above chance on trials of both types with static dots. Despite encountering greater difficulty with dots that moved within the arrays, one bear was able to discriminate numerically larger arrays of moving dots, and a subset of moving dots from within the larger array, even when area and number were incongruent. Thus, although the bears used area as a cue to guide responding, they were also able to use number as a cue. The pattern of performance was similar to that found previously with monkeys, and suggests that bears may also show other forms of sophisticated quantitative abilities.

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Figures

Figure 1

Figure 1

An example trial, showing the…

Figure 1

An example trial, showing the outlined boxes with dots contained within each. Shown…

Figure 1
An example trial, showing the outlined boxes with dots contained within each. Shown is an incongruent trial, because the array with the larger number of dots has the smaller overall area of pixilated dots. The trial shown here also shows how the arrays could be subdivided into subsets for which only black dots were relevant for comparing the two arrays.
Figure 2

Figure 2

Percentage correct as a function…

Figure 2

Percentage correct as a function of the ratio between area between arrays, on…

Figure 2
Percentage correct as a function of the ratio between area between arrays, on both congruent and incongruent trials, for Brutus, who chose larger (top), Bella (middle) and Dusty (bottom), who chose smaller, with static stimuli.
Figure 3

Figure 3

Percentage correct as a function…

Figure 3

Percentage correct as a function of ratio between number in the two arrays,…

Figure 3
Percentage correct as a function of ratio between number in the two arrays, on both congruent and incongruent trials, for Brutus, who chose larger (top), Bella (middle) and Dusty (bottom), who chose smaller, with moving stimuli.
Figure 4

Figure 4

Percentage correct as a function…

Figure 4

Percentage correct as a function of ratio between number in the two arrays,…

Figure 4
Percentage correct as a function of ratio between number in the two arrays, on both congruent and incongruent trials, for Brutus, who chose larger (top), and Dusty (bottom), who chose smaller, with subsets of moving stimuli.

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