Colour and Shape Discrimination in Black Lemurs (Eulemur macaco)

Gosset, Delphine; Roeder, Jean‐Jacques

doi:10.1159/000021737

Cited by 11 publications

(5 citation statements)

References 5 publications

(8 reference statements)

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“…In this study, we found that harbor seals discriminate between objects using the visual features of shape rather than brightness, at least for the objects we used in the experiment. This result differs from those of previous studies involving other terrestrial species (Elmore et al 2009, Gosset and Roeder 2000, Lucon-Xiccato et al 2019, Minini and Jeffery 2006, DeLong et al 2019. For terrestrial species, color or brightness difference is a significantly important parameter for foraging and avoiding predators (Bacon and Bugrhardt 1976).…”

Section: Discussioncontrasting

confidence: 91%

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ゼニガタアザラシ(<i>Phoca vitulina</i>)の視覚的物体認知に関する研究：形状と明度のどちらを優位に使用して物体を弁別しているのか

OGAWA,

MOMOI,

KUSHIHIKI

et al. 2023

Jpn. Cetol.

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Characteristics of visual functions differ between species as they have evolved independently to adapt to their habitat. Animals use shape and brightness to visually discriminate between objects. In this study, we used five harbor seals (Phoca vitulina) to determine how amphibious animals use these two features of visual function. The subjects were trained in a two-alternative forced-choice task to discriminate between a dark gray circle (correct object) and a light gray triangle. In the test phase, we prepared two novel objects in addition to the two objects used in the training. We randomly presented two of the four objects to the seals and compared the selection rate of each object. The results revealed that harbor seals discriminate between objects based on shape rather than brightness. The visual cognitive pattern of seals may be a result of adaptation to a light-scarce underwater environment. This is the first study to provide preliminary evidence of the visual cognitive features of seals.

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Section: Discussioncontrasting

confidence: 91%

“…Similar results have been reported for rhesus macaques (Macaca mulatta) (Cole 1953), black lemurs (Eulemur macaco) (Gosset and Roeder 2000), and guppies (Poecilia https://doi.org/10.5181/cetology.33.0_15…”

Section: Introductionsupporting

confidence: 83%

ゼニガタアザラシ(<i>Phoca vitulina</i>)の視覚的物体認知に関する研究：形状と明度のどちらを優位に使用して物体を弁別しているのか

OGAWA,

MOMOI,

KUSHIHIKI

et al. 2023

Jpn. Cetol.

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“…Macaques, like apes and humans, are trichromats. All three lemur species have photopigments consistent with dichromacy (Jacobs and Deegan 1993,2003; Leonhardt et al 2008), although there is behavioral evidence for color discrimination consistent with trichromacy in ring-tailed lemurs (Blakeslee and Jacobs 1985) and black lemurs (Gosset and Roeder 2000). Lemurs have also been shown to have lower visual acuity than Old World monkeys (Veilleux and Kirk 2009).…”

Section: Discussionmentioning

confidence: 98%

Lemurs and macaques show similar numerical sensitivity

et al. 2013

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We investigated the precision of the approximate number system (ANS) in three lemur species (Lemur catta, Eulemur mongoz, and Eulemur macaco flavifrons), one Old World monkey species (Macaca mulatta) and humans (Homo sapiens). In Experiment 1, four individuals of each nonhuman primate species were trained to select the numerically larger of two visual arrays on a touchscreen. We estimated numerical acuity by modeling Weber fractions (w) and found quantitatively equivalent performance among all four nonhuman primate species. In Experiment 2, we tested adult humans in a similar procedure, and they outperformed the four nonhuman species but showed qualitatively similar performance. These results indicate that the ANS is conserved over the primate order.

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“…Furthermore, research into cathemeral lemur color vision has been limited. A behavioral color discrimination test suggests that Eulemur macaco may be trichromatic [Gosset & Roeder, 2000], although similar results in L. catta were attributed to interaction between S cones, M cones, and rods [Blakeslee & Jacobs, 1985]. Measurements of cone spectral sensitivities for three E. macaco and four E. fulvus found only one cone type with l max at 543 nm [Bowmaker, 1991;Jacobs & Deegan, 1993].…”

Section: Introductionmentioning

confidence: 83%

Opsin gene polymorphism predicts trichromacy in a cathemeral lemur

Veilleux

Bolnick

2008

American J Primatol

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Recent research has identified polymorphic trichromacy in three diurnal strepsirrhines: Coquerel's sifaka (Propithecus coquereli), black and white ruffed lemurs (Varecia variegata), and red ruffed lemurs (V. rubra). Current hypotheses suggest that the transitions to diurnality experienced by Propithecus and Varecia were necessary precursors to their independent acquisitions of trichromacy. Accordingly, cathemeral lemurs are thought to lack the M/L opsin gene polymorphism necessary for trichromacy. In this study, the M/L opsin gene was sequenced in ten cathemeral blue-eyed black lemurs (Eulemur macaco flavifrons). This analysis identified a polymorphism identical to that of other trichromatic strepsirrhines at the critical amino acid position 285 in exon 5 of the M/L opsin gene. Thus, polymorphic trichromacy is likely present in at least one cathemeral Eulemur species, suggesting that strict diurnality is not necessary for trichromacy. The presence of trichromacy in E. m. flavifrons suggests that a re-evaluation of current hypotheses regarding the evolution of strepsirrhine trichromacy may be necessary. Although the M/L opsin polymorphism may have been independently acquired three times in the lemurid-indriid clade, the distribution of opsin alleles in lemurids and indriids may also be consistent with a common origin of trichromacy in the last common ancestor of either the lemurids or the lemurid-indriid clade.

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Colour and Shape Discrimination in Black Lemurs (Eulemur macaco)

Cited by 11 publications

References 5 publications

ゼニガタアザラシ(<i>Phoca vitulina</i>)の視覚的物体認知に関する研究：形状と明度のどちらを優位に使用して物体を弁別しているのか

ゼニガタアザラシ(<i>Phoca vitulina</i>)の視覚的物体認知に関する研究：形状と明度のどちらを優位に使用して物体を弁別しているのか

Lemurs and macaques show similar numerical sensitivity

Opsin gene polymorphism predicts trichromacy in a cathemeral lemur

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