03063nas a2200229   4500008004100000022001300041245012100054210006900175260001600244520211700260653002502377653001602402653003002418653001202448653001802460100002202478700002302500700002002523700003702543700002002580856023302600       2018                        eng d  a0168159100aDomestic piglets (Sus scrofa domestica) are attentive to human voice and able to discriminate some prosodic features0 aDomestic piglets Sus scrofa domestica are attentive to human voi  cJan-10-20183 a<p>Vocal communication is of major social importance in pigs. Their auditory sensitivity goes beyond the intraspecific level; studies have shown that domestic pigs are sensitive to and can learn to recognise human voices. The question of which prosodic features (intonation, accentuation, rhythm) of human speech may matter to this recognition, however, remains open. A total of 42 piglets were allocated to three experimental groups. Each piglet was submitted to three choice tests, during which different pairs of sounds were broadcast. Each group was first offered a choice between an unmodified (neutral) human voice and a background noise, in order to verify the attractiveness of human voice. We found that piglets could distinguish human voice; they gazed more rapidly (P&thinsp;&lt;&thinsp;0.05) and for longer (P&thinsp;&lt;&thinsp;0.05) in the direction of the human voice than in the direction of the background noise. Group 1 was then submitted to artificially modified voices: low vs high-pitched, and then slow vs rapid rhythm. Group 2 was submitted to artificially modified voices with a combination of these features: rapid and high-pitched vs slow and low-pitched, and then slow and high-pitched vs rapid and low-pitched. Group 3 was submitted to naturally recorded voices coding for different emotions (happiness vs anger) and then different intonations (interrogation vs command). We found that piglets approached the loudspeaker broadcasting the rapid rhythm (6&thinsp;s (2&ndash;32)) more rapidly than the loudspeaker broadcasting the slow rhythm (33&thinsp;s (15&ndash;70); p&thinsp;&lt;&thinsp;0.05). They also spent more time near the loudspeaker broadcasting the &ldquo;high-pitched and slow&rdquo; voice (86&thinsp;s (52&ndash;110)) than near the one broadcasting the &ldquo;low-pitched and rapid&rdquo; voice (29&thinsp;s (9&ndash;73); W&thinsp;=&thinsp;86, P&thinsp;&lt;&thinsp;0.05). In sum, the sensitivity of piglets for human prosody was moderate but not inexistent. Our results suggest that piglets base their responses to human voice on a combination of prosodic features.</p>
10aAuditory preferences10aChoice test10aHuman-animal relationship10aPiglets10aVoice prosody1 aBensoussan, Sandy1 aTigeot, Raphaëlle1 aLemasson, Alban1 aMeunier-Salaün, Marie-Christine1 aTallet, Céline  uhttps://linkinghub.elsevier.com/retrieve/pii/S0168159118301485https://api.elsevier.com/content/article/PII:S0168159118301485?httpAccept=text/xmlhttps://api.elsevier.com/content/article/PII:S0168159118301485?httpAccept=text/plain02837nas a2200241   4500008004100000022001300041245008800054210006900142260001600211300001200227490000800239520209800247653001802345653002102363653002102384653002402405653002202429653001902451100002202470700001702492700002002509856006602529       2017                        eng d  a0003347200aAge-dependent change in attention paid to vocal exchange rules in Japanese macaques0 aAgedependent change in attention paid to vocal exchange rules in  cJan-07-2017  a81 - 920 v1293 a<p>The mechanisms underlying vocal development in nonhuman primates, so-called &lsquo;nonlearners&rsquo;, are of special interest because they give an insight in how social factors can shape the expression of an already genetically determined vocal repertoire. Interestingly, recent studies suggest that the acquisition of the complex rules governing vocal exchanges (i.e. context-specific temporal and structural acoustic adjustments) may result from a socially guided development process, with social experience and parental selective feedback playing a key role. Among those conversational rules, call matching is a particularly remarkable phenomenon in Japanese macaques, Macaca fuscata, with interacting adult females matching the frequency range pattern of their own call with another female&#39;s preceding call. Here, we investigated whether fine-tuned acoustic adjustments during vocal exchanges in Japanese macaques are subject to developmental processes, specifically testing for the ability of individuals of different age classes to discriminate between vocal exchanges respecting, or not, the matching rule. We performed playback experiments in 10 adult and 10 1-year-old captive Japanese macaque females. Each subject was successively exposed to two stimuli: a pair of calls respecting call matching (i.e. two calls from two individuals with matched frequency ranges) and another pair of calls that did not. Adults discriminated better than juveniles whether stimuli respected the call-matching rule or not, and displayed significantly different levels of interest towards each stimulus type. The latency to look towards the loudspeaker was shorter, and the duration of the directed gaze was longer, after the playback that violated the matching expectation in every adult, but not in juveniles which seemingly displayed a random gaze response. Our findings support the conclusion that the matching rule is relevant for adults, but not for socially inexperienced young monkeys which may not have had enough experience of the conversational rules governing vocal exchanges.</p>
10acall matching10aJapanese Macaque10anonhuman primate10aplayback experiment10avocal development10avocal exchange1 aBouchet, Hélène1 aKoda, Hiroki1 aLemasson, Alban  uhttp://linkinghub.elsevier.com/retrieve/pii/S0003347217301495