Conserved alarm calls but rapid auditory learning in monkey responses to novel flying objects

Wegdell, Franziska; Hammerschmidt, Kurt; Fischer, Julia

doi:10.1038/s41559-019-0903-5

Cited by 42 publications

(63 citation statements)

References 37 publications

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“…Drone alarms were clearly distinct from the other two categories, with 95.2% correct classification. For male subjects, the overall correct classification was slightly lower, with 71.2% of calls correctly assigned to the context in which they were given, but yet again this was significantly better than chance [53]. Similar to the findings for females, male drone alarms could be most readily distinguished from the other two alarm call categories: 92.6% of drone calls by male green monkeys were correctly classified.…”

Section: (A) Alarm Calls In the Genus Chlorocebussupporting

confidence: 60%

“…In three cases, the subject immediately ran into cover after the presentation of the drone sound. This never happened in response to control experiments [53]. These findings are relevant for two reasons.…”

Section: (B) Rapid Comprehension Learning In Green Monkeysmentioning

confidence: 71%

“…More important in this context, after we had presented the drone, we conducted a playback experiment in which we played back the sound of the drone to the animals [53]. Following the presentation of the drone sound, the monkeys looked significantly longer in the direction of the loudspeaker and were more vigilant than in the control condition in which we played different familiar broad-band noises, such as the sound of the nearby generator.…”

Section: (B) Rapid Comprehension Learning In Green Monkeysmentioning

confidence: 99%

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Towards a new taxonomy of primate vocal production learning

Fischer

Hammerschmidt

2019

Phil. Trans. R. Soc. B

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The extent to which vocal learning can be found in nonhuman primates is key to reconstructing the evolution of speech. Regarding the adjustment of vocal output in relation to auditory experience (vocal production learning in the narrow sense), effects on the ontogenetic trajectory of vocal development as well as adjustment to group-specific call features have been found. Yet, a comparison of the vocalizations of different primate genera revealed striking similarities in the structure of calls and repertoires in different species of the same genus, indicating that the structure of nonhuman primate vocalizations is highly conserved. Thus, modifications in relation to experience only appear to be possible within relatively tight species-specific constraints. By contrast, comprehension learning may be extremely rapid and open-ended. In conjunction, these findings corroborate the idea of an ancestral independence of vocal production and auditory comprehension learning. To overcome the futile debate about whether or not vocal production learning can be found in nonhuman primates, we suggest putting the focus on the different mechanisms that may mediate the adjustment of vocal output in response to experience; these mechanisms may include auditory facilitation and learning from success. This article is part of the theme issue ‘What can animal communication teach us about human language?’

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Section: (A) Alarm Calls In the Genus Chlorocebussupporting

confidence: 60%

Section: (B) Rapid Comprehension Learning In Green Monkeysmentioning

confidence: 71%

Section: (B) Rapid Comprehension Learning In Green Monkeysmentioning

confidence: 99%

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Towards a new taxonomy of primate vocal production learning

Fischer

Hammerschmidt

2019

Phil. Trans. R. Soc. B

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Section: Introductionmentioning

confidence: 99%

Neural oscillations in the fronto-striatal network predict vocal output in bats

2020

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The ability to vocalize is ubiquitous in vertebrates, but neural networks underlying vocal control remain poorly understood. Here, we performed simultaneous neuronal recordings in the frontal cortex and dorsal striatum (caudate nucleus, CN) during the production of echolocation pulses and communication calls in bats. This approach allowed us to assess the general aspects underlying vocal production in mammals and the unique evolutionary adaptations of bat echolocation. Our data indicate that before vocalization, a distinctive change in highgamma and beta oscillations (50-80 Hz and 12-30 Hz, respectively) takes place in the bat frontal cortex and dorsal striatum. Such precise fine-tuning of neural oscillations could allow animals to selectively activate motor programs required for the production of either echolocation or communication vocalizations. Moreover, the functional coupling between frontal and striatal areas, occurring in the theta oscillatory band (4-8 Hz), differs markedly at the millisecond level, depending on whether the animals are in a navigational mode (that is, emitting echolocation pulses) or in a social communication mode (emitting communication calls). Overall, this study indicates that fronto-striatal oscillations could provide a neural correlate for vocal control in bats.

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“…Vocalization-based interactions between broadcaster and receiver play an important role in everyday life scenarios and are highly conserved throughout the animal kingdom 1,2 . Although neural mechanisms involved in auditory processing and perception have been extensively researched [3][4][5] , studies addressing subcortico-cortical network activity leading to vocal motor outputs remain sparse.…”

Section: Introductionmentioning

confidence: 99%

Fronto-striatal oscillations predict vocal output in bats

Weineck

García‐Rosales

Hechavarría

2019

Preprint

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Abbreviations AUC: area under the curve; BF: best frequency; CN: caudate nucleus; d: Cliff's Delta; dVS: difference in vector strength, FAF: frontal auditory field; IQR: inter-quartile range; LFP: local field potential; Med: median; PFC: prefrontal cortex; PSTH: peri-stimulus time histogram; SVM: support vector machine; VS: vector strength SummaryThe ability to vocalize is ubiquitous in vertebrates, but neural networks leading to vocalization production remain poorly understood. Here we performed simultaneous, large scale, neuronal recordings in the frontal cortex and dorsal striatum (caudate nucleus) during the production of echolocation and non-echolocation calls in bats. This approach allows to assess the general aspects underlying vocalization production in mammals and the unique evolutionary adaptations of bat echolocation. Our findings show that distinct intra-areal brain rhythms in the beta (12-30 Hz) and gamma (30-80 Hz) bands of the local field potential can be used to predict the bats' vocal output and that phase locking between spikes and field potentials occurs prior vocalization production. Moreover, the fronto-striatal network is differentially coupled in the theta-band during the production of echolocation and nonecholocation calls. Overall, our results present evidence for fronto-striatal network oscillations in motor action prediction in mammals.

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Conserved alarm calls but rapid auditory learning in monkey responses to novel flying objects

Cited by 42 publications

References 37 publications

Towards a new taxonomy of primate vocal production learning

Towards a new taxonomy of primate vocal production learning

Neural oscillations in the fronto-striatal network predict vocal output in bats

Fronto-striatal oscillations predict vocal output in bats

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