Effect of no-night light environment on behaviour, learning performance and personality in zebra finches

Jha, Neelu Anand; Kumar, Vinod

doi:10.1016/j.anbehav.2017.07.017

Cited by 36 publications

(48 citation statements)

References 43 publications

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“…We interpret this as indicative of depressive mood state in crows under dLAN, consistent with a previous finding on diurnal grass rats (Fonken et al., ). A similar impairment of response to NOE was found in zebra finches ( Taeniopygia guttata ) under LL (Jha & Kumar, ). We argue that dLAN‐induced depressive mood response was not because of an insufficient light during the daytime as reported in diurnal grass rat (Leach, Adidharma, & Yan, ), since house crows on same daytime light did not show any such effect under an LD; in fact, crows showed normal behaviour and cognitive performance with similar (150 lux) illumination during the light phase of 12L:12D (Taufique et al., ).…”

Section: Discussionsupporting

confidence: 67%

“…Tits showed an increased nocturnal activity, sleep loss, and shift in the timings of dawn and dusk singing (Da Silva, Samplonius, Schlicht, Valcu, & Kempenaers, ; Ouyang et al., ). Furthermore, a no‐night light (constant light, LL) environment caused negative effects on daily behavioural patterns, advanced brain functions like the acquisition of learning and cognition, and novel object exploration (NOE) in zebra finches ( Taeniopygia guttata ) when adult, and in the future generation (Jha & Kumar, ). LL also induced circadian rhythm disruptions and caused impairment of visuo‐spatial learning and memory in Indian house crows, Corvus splendens (Taufique & Kumar, ).…”

Section: Introductionmentioning

confidence: 99%

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Illuminated night alters hippocampal gene expressions and induces depressive‐like responses in diurnal corvids

Taufique

Prabhat

Kumar

2018

Eur J of Neuroscience

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Artificial light at night induces circadian disruptions and causes cognitive impairment and mood disorders; yet very little is known about the neural and molecular correlates of these effects in diurnal animals. We manipulated the night environment and examined cellular and molecular changes in hippocampus, the brain region involved in cognition and mood, of Indian house crows (Corvus splendens) exposed to 12 hr light (150 lux): 12 hr darkness (0 lux). Diurnal corvids are an ideal model species with cognitive abilities at par with mammals. Dim light (6 lux) at night (dLAN) altered daily activity:rest pattern, reduced sleep, and induced depressive-like responses (decreased eating and self-grooming, self-mutilation, and reduced novel object exploration); return to an absolute dark night reversed these negative effects. dLAN suppressed nocturnal melatonin levels; however, diurnal corticosterone levels were unaffected. Concomitant reduction of immunoreactivity for DCX and BDNF suggested dLAN-induced suppression of hippocampal neurogenesis and compromised neuronal health. dLAN also negatively influenced hippocampal expression of genes associated with depressive-like responses (bdnf, il-1β, tnfr1, nr4a2), but not of those associated with neuronal plasticity (egr1, creb, syngap, syn2, grin2a, grin2b), cellular oxidative stress (gst, sod3, cat1) and neuronal death (caspase2, caspase3, foxo3). Furthermore, we envisaged the role of BDNF and showed epigenetic modification of bdnf gene by decreased histone H3 acetylation and increased hdac4 expression under dLAN. These results demonstrate transcriptional and epigenetic bases of dLAN-induced negative effects in diurnal crows, and provide insights into the risks of exposure to illuminated nights to animals including humans in an urban setting.

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Section: Discussionsupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Illuminated night alters hippocampal gene expressions and induces depressive‐like responses in diurnal corvids

Taufique

Prabhat

Kumar

2018

Eur J of Neuroscience

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“…Recent years have seen a flurry of empirical studies testing this question, in a range of species (e.g. mammals, [24]; fish, [25]; birds, [26]). However, these results have not yet been synthesized in a quantitative way.…”

Section: Introductionmentioning

confidence: 99%

Linking personality and cognition: a meta-analysis

Dougherty

Guillette

2018

Phil. Trans. R. Soc. B

168

155

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In the past decade, several conceptual papers have linked variation in animal personality to variation in cognition, and recent years have seen a flood of empirical studies testing this link. However, these results have not been synthesized in a quantitative way. Here, we systematically search the literature and conduct a phylogenetically controlled meta-analysis of empirical papers that have tested the relationship between animal personality (exploration, boldness, activity, aggression and sociability) and cognition (initial learning/reversal speed, number of correct choices/errors after standard training). We find evidence for a small but significant relationship between variation in personality and variation in learning across species in the absolute scale; however, the of this relationship is highly variable and when both positive and negative effect sizes are considered, the average effect size does not differ significantly from zero. Importantly, this variation among studies is not explained by differences in personality or learning measure, or taxonomic grouping. Further, these results do not support current hypotheses suggesting that that fast-explorers are fast-learners or that slow-explorers perform better on tests of reversal learning. Rather, we find evidence that bold animals are faster learners, but only when boldness is measured in response to a predator (or simulated predator) and not when boldness is measured by exposure to a novel object (or novel food). Further, although only a small sub-sample of papers reported results separately for males and females, sex explained a significant amount of variation in effect size. These results, therefore, suggest that, while personality and learning are indeed related across a range of species, the direction of this relationship is highly variable. Thus further empirical work is needed to determine whether there are important moderators of this relationship.This article is part of the theme issue 'Causes and consequences of individual differences in cognitive abilities'.

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“…In birds, cognition is affected by sleep, and thus cognitive abilities may be altered by sleep disruption due to ALAN [16]. In a recent study, birds kept under constant daylight showed a disruption in their activity patterns and a deterioration in their cognitive performance [27]. However, the effects of dim rather than constant bright ALAN on cognition remain unknown.…”

Section: Introductionmentioning

confidence: 99%

The preference and costs of sleeping under light at night in forest and urban great tits

et al. 2019

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Artificial light at night (ALAN) is an increasing phenomenon associated with worldwide urbanization. In birds, broad-spectrum white ALAN can have disruptive effects on activity patterns, metabolism, stress response and immune function. There has been growing research on whether the use of alternative light spectra can reduce these negative effects, but surprisingly, there has been no study to determine which light spectrum birds prefer. To test such a preference, we gave urban and forest great tits (Parus major) the choice where to roost using pairwise combinations of darkness, white light or green dim light at night (1.5 lux). Birds preferred to sleep under artificial light instead of darkness, and green was preferred over white light. In a subsequent experiment, we investigated the consequence of sleeping under a particular light condition, and measured birds' daily activity levels, daily energy expenditure (DEE), oxalic acid as a biomarker for sleep debt and cognitive abilities. White light affected activity patterns more than green light. Moreover, there was an origin-dependent response to spectral composition: in urban birds, the total daily activity and night activity did not differ between white and green light, while forest birds were more active under white than green light. We also found that individuals who slept under white and green light had higher DEE. However, there were no differences in oxalic acid levels or cognitive abilities between light treatments. Thus, we argue that in naive birds that had never encountered light at night, white light might disrupt circadian rhythms more than green light. However, it is possible that the negative effects of ALAN on sleep and cognition might be observed only under intensities higher than 1.5 lux. These results suggest that reducing the intensity of light pollution as well as tuning the spectrum towards long wavelengths may considerably reduce its impact.

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Effect of no-night light environment on behaviour, learning performance and personality in zebra finches

Cited by 36 publications

References 43 publications

Illuminated night alters hippocampal gene expressions and induces depressive‐like responses in diurnal corvids

Illuminated night alters hippocampal gene expressions and induces depressive‐like responses in diurnal corvids

Linking personality and cognition: a meta-analysis

The preference and costs of sleeping under light at night in forest and urban great tits

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