Shaping a lateralized brain: Asymmetrical light experience modulates access to visual interhemispheric information in pigeons

Letzner, Sara; Patzke, Nina; Verhaal, Josine; Manns, Martina

doi:10.1038/srep04253

Cited by 35 publications

(27 citation statements)

References 47 publications

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“…Consequently, left-sided tectofugal lesions result in more severe visual deficits than right-sided ones (G€ unt€ urk€ un and Hahmann, 1999;Valencia-Alfonso et al, 2009). Dark incubation abolishes these anatomical tectofugal asymmetries (Manns and G€ unt€ urk€ un, 1999a(Manns and G€ unt€ urk€ un, , 1999b(Manns and G€ unt€ urk€ un, , 2003 and alters inter-hemispheric transfer (Manns and Rö mling, 2012;Letzner et al, 2014). Thus, lateralized light input before hatch induces both structural and behavioral asymmetries.…”

Section: Avian Asymmetry: From Stimulation Asymmetry To Lateralized Cmentioning

confidence: 99%

Ontogenesis of Lateralization

Güntürkün

Ocklenburg

2017

Neuron

191

150

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The brains of humans and other animals are asymmetrically organized, but we still know little about the ontogenetic and neural fundaments of lateralizations. Here, we review the current state of understanding about the role of genetic and non-genetic factors for the development of neural and behavioral asymmetries in vertebrates. At the genetic level, the Nodal signaling cascade is of central importance, but several other genetic pathways have been discovered to also shape the lateralized embryonic brain. Studies in humans identified several relevant genes with mostly small effect sizes but also highlight the extreme importance of non-genetic factors for asymmetry development. This is also visible in visual asymmetry in birds, in which genes only affect embryonic body position, while the resulting left-right difference of visual stimulation shapes visual pathways in a lateralized way. These and further studies in zebrafish and humans highlight that the many routes from genes to asymmetries of function run through left-right differences of neural pathways. They constitute the lateralized blueprints of our perception, cognition, and action.

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Section: Avian Asymmetry: From Stimulation Asymmetry To Lateralized Cmentioning

confidence: 99%

Ontogenesis of Lateralization

Güntürkün

Ocklenburg

2017

Neuron

191

150

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“…The exposure of embryos to light not only enhances development of the right-eye-system in advance of the left-eye-system but also leads to the left hemisphere being able to inhibit the right hemisphere via interhemispheric neural connections [80,81]. Further experiments have shown, in pigeons, that light exposure of the embryo modulates the balance between the hemispheres [82].…”

Section: Development and The Role Of Lightmentioning

confidence: 99%

Does Functional Lateralization in Birds Have any Implications for Their Welfare?

Rogers

Kaplan

2019

Symmetry

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We know a good deal about brain lateralization in birds and a good deal about animal welfare, but relatively little about whether there is a noteworthy relationship between avian welfare and brain lateralization. In birds, the left hemisphere is specialised to categorise stimuli and to discriminate preferred categories from distracting stimuli (e.g., food from an array of inedible objects), whereas the right hemisphere responds to small differences between stimuli, controls social behaviour, detects predators and controls attack, fear and escape responses. In this paper, we concentrate on visual lateralization and the effect of light exposure of the avian embryo on the development of lateralization, and we consider its role in the welfare of birds after hatching. Findings suggest that light-exposure during incubation has a general positive effect on post-hatching behaviour, likely because it facilitates control of behaviour by the left hemisphere, which can suppress fear and other distress behaviour controlled by the right hemisphere. In this context, particular attention needs to be paid to the influence of corticosterone, a stress hormone, on lateralization. Welfare of animals in captivity, as is well known, has two cornerstones: enrichment and reduction of stress. What is less well-known is the link between the influence of experience on brain lateralization and its consequent positive or negative outcomes on behaviour. We conclude that the welfare of birds may be diminished by failure to expose the developing embryos to light but we also recognise that more research on the association between lateralization and welfare is needed.

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“…Previous studies indicate that light play a vital role in affecting function and behavior of chickens 4 5 6 7 . Further it has been reported that light manipulation has been an effective measure to improve poultry production 8 9 10 .…”

mentioning

confidence: 99%

A new method to manipulate broiler chicken growth and metabolism: Response to mixed LED light system

Yang

Pan

et al. 2016

Sci Rep

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Present study introduced a new method to manipulate broiler chicken growth and metabolism by mixing the growth-advantage LED. We found that the green/blue LED mixed light system (G-B and G × B) have the similar stimulatory effect on chick body weight with single green light and single blue light (G and B), compared with normal artificial light (P = 0.028). Moreover, the percentage of carcass was significantly greater in the mixed light (G × B) when compared with the single light (P = 0.003). Synchronized with body weight, the mixed light (G-B and G × B) had a significant improved influence on the feed conversion of birds compared with normal light (P = 0.002). A significant improvement in feed conversion were found in mixed light (G × B) compared with single LED light (P = 0.037). G group resulted in a greater high-density lipoprotein cholesterol level than B group (P = 0.002), whereas B group resulted in a greater low-density lipoprotein cholesterol level than G group (P = 0.017). The mixed light significantly increased the birds’ glucose level in comparison with the single light (P = 0.003). This study might establish an effective strategy for maximizing growth of chickens by mixed LED technology.

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Shaping a lateralized brain: Asymmetrical light experience modulates access to visual interhemispheric information in pigeons

Cited by 35 publications

References 47 publications

Ontogenesis of Lateralization

Ontogenesis of Lateralization

Does Functional Lateralization in Birds Have any Implications for Their Welfare?

A new method to manipulate broiler chicken growth and metabolism: Response to mixed LED light system

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