Alle Publikationen
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2017
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(2017): Perceived differences in social status between speaker and listener affect the speaker's vocal characteristics. In: PLoS one 12 (6). DOI: 10.1371/journal.pone.0179407
DOI: http://www.ncbi.nlm.nih.gov/pubmed/28614413 Abstract: Non-verbal behaviours, including voice characteristics during speech, are an important way to communicate social status. Research suggests that individuals can obtain high social status through dominance (using force and intimidation) or through prestige (by being knowledgeable and skilful). However, little is known regarding differences in the vocal behaviour of men and women in response to dominant and prestigious individuals. Here, we tested within-subject differences in vocal parameters of interviewees during simulated job interviews with dominant, prestigious, and neutral employers (targets), while responding to questions which were classified as introductory, personal, and interpersonal. We found that vocal modulations were apparent between responses to the neutral and high-status targets, with participants, especially those who perceived themselves as low in dominance, increasing fundamental frequency (F0) in response to the dominant and prestigious targets relative to the neutral target. Self-perceived prestige, however, was less related to contextual vocal modulations than self-perceived dominance. Finally, we found that differences in the context of the interview questions participants were asked to respond to (introductory, personal, interpersonal), also affected their vocal parameters, being more prominent in responses to personal and interpersonal questions. Overall, our results suggest that people adjust their vocal parameters according to the perceived social status of the listener as well as their own self-perceived social status.
Keywords: Acoustic Stimulation, Adolescent, Adult, Auditory Perception/physiology, Diagnostic Self Evaluation, Female, fundamental frequency, Humans, Interviews as Topic/methods, Macht, Male, Middle Aged, Social Class, Social Perception, Socioeconomic Factors, Soziale Dominanz, Speech Acoustics, Speech/physiology, Status / biologische Marker, Stimme, Stimme / Prosodie, Voice/physiology, Young Adult 2014
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(2014): How does the extraction of local and global auditory regularities vary with context?. In: PLoS one 9 (9). DOI: 10.1371/journal.pone.0107227
DOI: http://www.ncbi.nlm.nih.gov/pubmed/25197987 Abstract: How does the human brain extract regularities from its environment? There is evidence that short range or 'local' regularities (within seconds) are automatically detected by the brain while long range or 'global' regularities (over tens of seconds or more) require conscious awareness. In the present experiment, we asked whether participants' attention was needed to acquire such auditory regularities, to detect their violation or both. We designed a paradigm in which participants listened to predictable sounds. Subjects could be distracted by a visual task at two moments: when they were first exposed to a regularity or when they detected violations of this regularity. MEG recordings revealed that early brain responses (100-130 ms) to violations of short range regularities were unaffected by visual distraction and driven essentially by local transitional probabilities. Based on global workspace theory and prior results, we expected that visual distraction would eliminate the long range global effect, but unexpectedly, we found the contrary, i.e. late brain responses (300-600 ms) to violations of long range regularities on audio-visual trials but not on auditory only trials. Further analyses showed that, in fact, visual distraction was incomplete and that auditory and visual stimuli interfered in both directions. Our results show that conscious, attentive subjects can learn the long range dependencies present in auditory stimuli even while performing a visual task on synchronous visual stimuli. Furthermore, they acquire a complex regularity and end up making different predictions for the very same stimulus depending on the context (i.e. absence or presence of visual stimuli). These results suggest that while short-range regularity detection is driven by local transitional probabilities between stimuli, the human brain detects and stores long-range regularities in a highly flexible, context dependent manner.
2013
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(2013): Being and feeling in sync with an adaptive virtual partner. Brain mechanisms underlying dynamic cooperativity. In: Cerebral cortex (New York, N.Y. : 1991) 23 (11), S. 2592-2600. DOI: 10.1093/cercor/bhs243
DOI: http://www.ncbi.nlm.nih.gov/pubmed/22892422 Abstract: Cooperation is intrinsic to the human ability to work together toward common goals, and depends on sensing and reacting to dynamically changing relationships between coacting partners. Using functional magnetic resonance imaging (fMRI) and a paradigm in which an adaptive pacing signal simulates a virtual partner, we examined the neural substrates underlying dynamic joint action. A single parameter controlled the degree to which the virtual partner adapted its behavior in relation to participant taps, thus simulating varying degrees of cooperativity. Analyses of fMRI data using objective and subjective measures of synchronization quality found the relative balance of activity in two distinct neural networks to depend on the degree of the virtual partner's adaptivity. At lower degrees of adaptivity, when the virtual partner was easier to synchronize with, cortical midline structures were activated in conjunction with premotor areas, suggesting a link between the action and socio-affective components of cooperation. By contrast, right lateral prefrontal areas associated with central executive control processes were recruited during more cognitively challenging interactions while synchronizing with an overly adaptive virtual partner. Together, the reduced adaptive sensorimotor synchronization paradigm and pattern of results illuminate neural mechanisms that may underlie the socio-emotional consequences of different degrees of entrainment success.
Keywords: Acoustic Stimulation, adaptation, Adult, Anpassung, BRAIN, Brain Mapping, Cooperative Behavior, Emotions, Female, Gehirnfunktion, Humans, Kognitionswissenschaft/Social Sciences/Humanities, Kognitive Skills/Social Cognition, Kooperation, Magnetic Resonance Imaging, Male, Photic Stimulation, physiology, Psychological, Sensory Feedback, User-Computer Interface, Young Adult
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