Vocal plasticity in a reptile

Brumm, Henrik; Zollinger, Sue Anne

doi:10.1098/rspb.2017.0451

Cited by 31 publications

(22 citation statements)

References 46 publications

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“…The first reptiles appeared around 340 million years (Benton and Donoghue, 2007). They exhibit a greater diversity of behavior than anamniotes and for some species such as crocodiles and lizards, a relatively high encephalization quotient (the ratio of brain weight to body weight) and more elaborate social behaviors have been described (Brumm and Zollinger, 2017;O'Connell and Hofmann, 2011). In these species, the DP still represents less than 20% of the total cerebral mass and the structure does not differ significantly from that of the anamniotes.…”

Section: Fishes Frogs and Reptilesmentioning

confidence: 99%

A natural history of skills

Boraud

Leblois

Rougier

2018

Progress in Neurobiology

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The dorsal pallium (a.k.a. cortex in mammals) makes a loop circuit with the basal ganglia and the thalamus known to control and adapt behavior but the who's who of the functional roles of these structures is still debated. Influenced by the Triune brain theory that was proposed in the early sixties, many current theories propose a hierarchical organization on the top of which stands the cortex to which the subcortical structures are subordinated. In particular, habits formation has been proposed to reflect a switch from conscious on-line control of behavior by the cortex, to a fully automated subcortical control. In this review, we propose to revalue the function of the network in light of the current experimental evidence concerning the anatomy and physiology of the basal ganglia-cortical circuits in vertebrates. We briefly review the current theories and show that they could be encompassed in a broader framework of skill learning and performance. Then, after reminding the state of the art concerning the anatomical architecture of the network and the underlying dynamic processes, we summarize the evolution of the anatomical and physiological substrate of skill learning and performance among vertebrates. We then review experimental evidence supporting for the hypothesis that the development of automatized skills relies on the BG teaching cortical circuits and is actually a late feature linked with the development of a specialized cortex or pallium that evolved in parallel in different taxa. We finally propose a minimal computational framework where this hypothesis can be explicitly implemented and tested.

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Section: Fishes Frogs and Reptilesmentioning

confidence: 99%

A natural history of skills

Boraud

Leblois

Rougier

2018

Progress in Neurobiology

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“…To overcome a loss of information transfer, signaling individuals may adjust their signaling behavior by adapting the signal to the environment. For example, Tokay Geckos (Gekko gecko) have been found to increase the duration of their typically brief call notes in a noisy environment, in order to make them more easily heard (Brumm and Zollinger, 2017). Alternatively, signaling individuals may switch to different modalities that are not, or are less affected by environmental changes, such as found in tree frogs that produce more visual signals when background noise is high (Grafe et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Noise Affects Multimodal Communication During Courtship in a Marine Fish

et al. 2018

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Selection pressures on signals can be substantially modified by a changing environment, but we know little about how modified selection pressures act on multimodal signals. The currently increasing levels of anthropogenic noise in the ocean may affect the use of acoustic signaling relative to other modalities. In the Painted Goby (Pomatoschistus pictus), visual and acoustic signals are associated during courtship behavior, but females usually rely more heavily on acoustic signals than on visual signals in mate choice. In an aquarium experiment, we compared male courtship behavior and female spawning decisions between silent treatments and treatments with additional noise. We found that the relationships between male characteristics, male visual and acoustic courtship, and spawning success were affected by noise. A path analysis revealed that females pay more attention to visual courtship in noisy circumstances compared to control. We conclude that environmental stressors can cause shifts in the use of different signaling modalities for spawning decisions and discuss how selection pressures on multimodal signals may change with increasing noise-levels.

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“…The Lombard effect has been widely reported in mammals and birds (Brumm & Zollinger, ). A recent study demonstrating the lack of the Lombard effect in a reptile (Brumm & Zollinger, ) supports the view that the Lombard effect has evolved independently in birds and mammals, but the condition in amphibians is unresolved. Initially, the existence of a noise‐dependent increase in call amplitude was considered debatable in anurans (Love & Bee, ); however, two recent studies have provided important evidence for its occurrence (Halfwerk et al, ; Shen & Xu, ).…”

Section: Discussionmentioning

confidence: 76%

Males increase call frequency, not intensity, in response to noise, revealing no Lombard effect in the little torrent frog

Zhao

Sun

Chen

et al. 2018

Ecology and Evolution

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Noise is one of the main factors that can influence the processes of sound communication across a wide range of animal groups. Although the effects of ambient noise on animal communication, including anthropogenic noise, have received increasing attention, few studies have examined changes in the fine structure of acoustic signals produced by vocalizing species in constantly noisy environments. Here, we used natural recordings to determine the associations between stream noise and call parameters in the little torrent frog (Amolops torrentis). We also used playbacks of stream noise recorded in natural habitats and playbacks of white noise to examine how male vocal signals change with increasing noise levels. The results show that noise intensity has a significant effect on male call frequency, but not on call amplitude or other call characteristics. Based on this evidence, we suggest that in streamside species stream noise drives males to alter call frequency and call as loudly as possible in order to improve discriminability. These findings provide insights into the role played by ecological selection in the evolution of noise‐dependent anuran vocal plasticity.

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Vocal plasticity in a reptile

Cited by 31 publications

References 46 publications

A natural history of skills

A natural history of skills

Noise Affects Multimodal Communication During Courtship in a Marine Fish

Males increase call frequency, not intensity, in response to noise, revealing no Lombard effect in the little torrent frog

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