Near-field visual acuity in Japanese jungle crows (Corvus macrorhynchos)

Yamamoto, Keiko; Furuya, Izumi; Watanabe, Shigeru

doi:10.1016/s0031-9384(00)00356-5

Cited by 17 publications

(8 citation statements)

References 13 publications

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“…Crows have excellent visual acuity, arguably better than pigeons and comparable with owls (Strigiformes; Yamamoto et al. ), and have wide and vertically long binocular fields (Fernàndez‐Juricic et al. ).…”

Section: Discussionmentioning

confidence: 99%

“…Perception of intent based on facial expressions may be a specialized system unique to primates and possibly some domesticated mammals (Vas et al 2005;Tate et al 2006), but studies indicate that at the very least, birds have the sensory capability to distinguish human facial expressions (rock pigeons; Jitsumori & Yoshihara 1997;Soto & Wasserman 2011). Crows have excellent visual acuity, arguably better than pigeons and comparable with owls (Strigiformes; Yamamoto et al 2001), and have wide and vertically long binocular fields (Fern andez-Juricic et al 2010). Indeed, crow species can make fine-scale discriminations of human facial features including recognizing previously threatening humans at a distance in the wild (Marzluff et al 2010) and distinguishing male from female human faces in the laboratory (Bogale et al 2011).…”

Section: Discussionmentioning

confidence: 99%

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Do American Crows Pay Attention to Human Gaze and Facial Expressions?

et al. 2013

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Interactions between species can lead to the evolution of interspecific communication. Non‐verbal communication by humans, both intentional and unintentional, can be interpreted by other species. We tested whether American crows (Corvus brachyrhynchos) were sensitive to human facial features under field conditions by comparing flight initiation distances and urgency of escape behavior to human approaches varying in eye contact and facial expression. We first examined whether crows distinguish between an approaching human who is directly gazing at them and a human approaching them with an averted gaze. In a second experiment, we tested whether crows differentiate a smiling from scowling human approaching them with direct or averted gaze. In the first experiment, we found that crows fled sooner and more urgently when humans were directly gazing at them. Similarly, in the second experiment, crows responded sooner to a direct vs. averted gaze; however, they did not react differently to varying human facial expressions. We suggest that crows use human gaze as a reliable visual cue compared with facial expressions when making decisions about responding to approaching humans. This is the first study to show that a wild corvid species changes its behavior based on human gaze, possibly representing an adaptation to living in human‐dominated urban areas and suggesting crows might perceive human intention by this visual cue.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Do American Crows Pay Attention to Human Gaze and Facial Expressions?

et al. 2013

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“…It appears that food might have been a stronger cue for the bonobos than for the rooks. This is unlikely to be due to poorer visual skills in the rooks, as most birds, pigeons in particular, are well known for excellent visual discrimination abilities and jungle crows, another member of the corvid family, have been shown to perform better than pigeons on a visual acuity task (Yamamoto et al, 2001). It is possible therefore that the bonobos may have been more motivated by food than the rooks.…”

Section: Discussionmentioning

confidence: 99%

What do bonobos (Pan paniscus) understand about physical contact?

Helme

Call

Clayton

et al. 2006

Journal of Comparative Psychology

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The present study aimed to test what bonobos (Pan paniscus) understand about contact. The task consisted of a clear horizontal tube containing a piece of food and a stick with a disk attached. The bonobos chose which side to push or pull the stick for the disk to contact the food and make it accessible. There were 9 variations in tube design, which differed in the positions of the stick, disk, and food. All 5 bonobos passed at least 1 configuration. A recent study (A. E. Helme, N. S. Clayton, & N. J. found that rooks could learn only tube configurations that provided an asymmetrical stick cue, whereas bonobos did not demonstrate an understanding of contact but showed more individual variation, attending to the positions of the food, disk, and stick.

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“…Fite and Rosenfield-Wessels (1975) estimated the visual acuity of a species of crow (Cyanocitta cristata) and found values that ranged from 15 to 19 cpd. Yamamoto et al (2001) used behavioral methods and estimated the visual acuity of the Japanese jungle crow (Corvus macrorhyncos) to be 8.4 cpd. Reymond and Wolfe (1981) and Reymond (1985) studied the luminance CSF of the eagle (Aquila audax) using behavioral methods.…”

Section: Luminance Spatial Contrast Sensitivity Of Birdsmentioning

confidence: 99%

Comparative neurophysiology of spatial luminance contrast sensitivity.

Souza

Gomès

Silveira

2011

Psychology & Neuroscience

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The luminance contrast sensitivity function has been investigated using behavioral and electrophysiological methods in many vertebrate species. Some features are conserved across species as a shape of the function, but other features, such as the contrast sensitivity peak value, spatial frequency contrast sensitivity peak, and visual acuity have changed. Here, we review contrast sensitivity across different classes of vertebrates, with an emphasis on the frequency contrast sensitivity peak and visual acuity. We also correlate the data obtained from the literature to test the power of the association between visual acuity and the spatial frequency of the contrast sensitivity function peak.

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Near-field visual acuity in Japanese jungle crows (Corvus macrorhynchos)

Cited by 17 publications

References 13 publications

Do American Crows Pay Attention to Human Gaze and Facial Expressions?

Do American Crows Pay Attention to Human Gaze and Facial Expressions?

What do bonobos (Pan paniscus) understand about physical contact?

Comparative neurophysiology of spatial luminance contrast sensitivity.

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