Learning to pause: Fidelity of and biases in the developmental acquisition of gaps in the communicative signals of a songbird

The temporal organization of sounds used in social contexts can provide information about signal function and evoke varying responses in listeners (receivers). For example, music is a universal and learned human behavior that is characterized by different rhythms and tempos that can evoke disparate responses in listeners. Similarly, birdsong is a social behavior in songbirds that is learned during critical periods in development and used to evoke physiological and behavioral responses in receivers. Recent investigations have begun to reveal the breadth of universal patterns in birdsong and their similarities to common patterns in speech and music, but relatively little is known about the degree to which biological predispositions and developmental experiences interact to shape the temporal patterning of birdsong. Here, we investigated how biological predispositions modulate the acquisition and production of an important temporal feature of birdsong, namely the duration of silent pauses (“gaps”) between vocal elements (“syllables”). Through analyses of semi-naturally raised and experimentally tutored zebra finches, we observed that juvenile zebra finches imitate the durations of the silent gaps in their tutor's song. Further, when juveniles were experimentally tutored with stimuli containing a wide range of gap durations, we observed biases in the prevalence and stereotypy of gap durations. Together, these studies demonstrate how biological predispositions and developmental experiences differently affect distinct temporal features of birdsong and highlight similarities in developmental plasticity across birdsong, speech, and music.

Research Highlights

• The temporal organization of learned acoustic patterns can be similar across human cultures and across species, suggesting biological predispositions in acquisition.
• We studied how biological predispositions and developmental experiences affect an important temporal feature of birdsong, namely the duration of silent intervals between vocal elements (“gaps”).
• Semi-naturally and experimentally tutored zebra finches imitated the durations of gaps in their tutor's song and displayed some biases in the learning and production of gap durations and in gap variability.
• These findings in the zebra finch provide parallels with the acquisition of temporal features of speech and music in humans.

     

Preliminary evidence for selective cortical responses to music in one-month-old infants

Prior studies have observed selective neural responses in the adult human auditory cortex to music and speech that cannot be explained by the differing lower-level acoustic properties of these stimuli. Does infant cortex exhibit similarly selective responses to music and speech shortly after birth? To answer this question, we attempted to collect functional magnetic resonance imaging (fMRI) data from 45 sleeping infants (2.0- to 11.9-weeks-old) while they listened to monophonic instrumental lullabies and infant-directed speech produced by a mother. To match acoustic variation between music and speech sounds we (1) recorded music from instruments that had a similar spectral range as female infant-directed speech, (2) used a novel excitation-matching algorithm to match the cochleagrams of music and speech stimuli, and (3) synthesized “model-matched” stimuli that were matched in spectrotemporal modulation statistics to (yet perceptually distinct from) music or speech. Of the 36 infants we collected usable data from, 19 had significant activations to sounds overall compared to scanner noise. From these infants, we observed a set of voxels in non-primary auditory cortex (NPAC) but not in Heschl's Gyrus that responded significantly more to music than to each of the other three stimulus types (but not significantly more strongly than to the background scanner noise). In contrast, our planned analyses did not reveal voxels in NPAC that responded more to speech than to model-matched speech, although other unplanned analyses did. These preliminary findings suggest that music selectivity arises within the first month of life. A video abstract of this article can be viewed at https://youtu.be/c8IGFvzxudk .

Research Highlights

• Responses to music, speech, and control sounds matched for the spectrotemporal modulation-statistics of each sound were measured from 2- to 11-week-old sleeping infants using fMRI.
• Auditory cortex was significantly activated by these stimuli in 19 out of 36 sleeping infants.
• Selective responses to music compared to the three other stimulus classes were found in non-primary auditory cortex but not in nearby Heschl's Gyrus.
• Selective responses to speech were not observed in planned analyses but were observed in unplanned, exploratory analyses.

     

The neonate brain's sensitivity to repetition-based structure: Specific to speech?

Newborns are able to extract and learn repetition-based regularities from the speech input, that is, they show greater brain activation in the bilateral temporal and left inferior frontal regions to trisyllabic pseudowords of the form AAB (e.g., “babamu”) than to random ABC sequences (e.g., “bamuge”). Whether this ability is specific to speech or also applies to other auditory stimuli remains unexplored. To investigate this, we tested whether newborns are sensitive to regularities in musical tones. Neonates listened to AAB and ABC tones sequences, while their brain activity was recorded using functional Near-Infrared Spectroscopy (fNIRS). The paradigm, the frequency of occurrence and the distribution of the tones were identical to those of the syllables used in previous studies with speech. We observed a greater inverted (negative) hemodynamic response to AAB than to ABC sequences in the bilateral temporal and fronto-parietal areas. This inverted response was caused by a decrease in response amplitude, attributed to habituation, over the course of the experiment in the left fronto-temporal region for the ABC condition and in the right fronto-temporal region for both conditions. These findings show that newborns’ ability to discriminate AAB from ABC sequences is not specific to speech. However, the neural response to musical tones and spoken language is markedly different. Tones gave rise to habituation, whereas speech was shown to trigger increasing responses over the time course of the study. Relatedly, the repetition regularity gave rise to an inverted hemodynamic response when carried by tones, while it was canonical for speech. Thus, newborns’ ability to detect repetition is not speech-specific, but it engages distinct brain mechanisms for speech and music.

Research Highlights

• The ability of newborns’ to detect repetition-based regularities is not specific to speech, but also extends to other auditory modalities.
• The brain mechanisms underlying speech and music processing are markedly different.

     

Communication,reflexivity and harm principle: what might an ideal speech situation look like in responsibility to protect?

ABSTRACT

Previous accounts of International Relations research have extensively focused on deontological ethics in analysing Responsibility to Protect (R2P). At the same time, discourse ethics – along with Jürgen Habermas’ theory of ideal speech situation – has been overlooked. This article argues that the R2P process has gradually moved toward the Habermasian ideal speech situation. The Habermasian approach also provides a useful theoretical framework to understand the new, more inclusive and critical, forums of communication and initiatives set in motion by emerging non-Western norm-entrepreneurs in the R2P process, notably the Responsibility while Protecting (RwP) initiated by Brazil in 2011. From the perspective of discourse ethics, RwP could be understood as a cosmopolitan harm principle designed to manage the potentially harmful side-effects of the application of R2P. The article further argues that, despite the current paradigm shift of norm-entrepreneurship on R2P from deontological ethics to discourse ethics, it has thus far only partially fulfilled the criteria of an ideal speech situation.     

Taiwanese speech–language therapists’ awareness and experiences of service provision to transgender clients

Background: One of the most influential factors that affect the quality of life of transgender individuals is whether they can be perceived by others to “pass” in their felt gender. Voice and communication style are two important identifying dimensions of gender and many transgender individuals wish to acquire a voice that matches their gender. Evidence shows that few transgender individuals access voice therapy, and that this is caused by their concerns about stigmatization or negative past experiences within healthcare services. In order to address the negative experiences faced by transgender populations we need a better understanding of healthcare services’ current levels of knowledge and LGBT awareness. Some studies of Speech–Language Therapists’ (SLTs’) experience and confidence working with transgender individuals have recently been undertaken in the United States (US). However, little research has been carried out in Asia.

Aims: To investigate Taiwanese SLTs’ knowledge, attitudes and experiences of providing transgender individuals with relevant therapy.

Method: A cross-sectional self-administered web-based survey hosted on the Qualtrics platform was delivered to 140 Taiwanese SLTs.

Results: Taiwanese SLTs were, (i) more familiar with the terminology used to address “lesbian, gay, and bisexual groups” than with “transgender” terminology, (ii) generally positive in their attitudes toward transgender individuals, and (iii) comfortable about providing clinical services to transgender clients. However, the majority of participants did not feel that they were sufficiently skilled in working with transgender individuals, even though most believed that providing them with voice and communication services fell within the SLT scope of practice.

Conclusion: It is important for clinicians to both be skilled in transgender voice and communication therapy and to be culturally competent when providing services to transgender individuals. This study recommends that cultural competence relating to gender and sexual minority groups should be addressed in SLTs’ university education as well as in their continuing educational programs.     

The Taciturn Exemplar

Early Confucian thinkers have an intense interest in the external aspects of moral exemplars. This article explores this interest by unpacking a complicated relation between silence, speech, and moral cultivation in the Analects. Situating Confucius’s desire to be silent in a pedagogical context, this article points out a tension between speaking of moral knowledge and personalizing it. It argues that silence is considered a desirable pedagogical practice because it fosters a more intimate relation between people and the moral knowledge they receive. This article then offers a detailed analysis of several difficult pedagogical moments between Confucius and two of his most eloquent students, Zigong and Zai Wo. Their problematic ways of speaking provide cases in point that flesh out the arguments sketched above. This article concludes by reflecting on how silence can also be alienating in moral cultivation, and on how people’s styles of speech may shape who they are.     

‘I do not cognize myself through being conscious of myself as thinking’: Self-knowledge and the irreducibility of self-objectification in Kant

ABSTRACT

The paper argues that Kant’s distinction between pure and empirical apperception cannot be interpreted as distinguishing two self-standing types of self-knowledge. For Kant, empirical and pure apperception need to co-operate to yield substantive self-knowledge. What makes Kant’s account interesting is his acknowledgment that there is a deep tension between the way I become conscious of myself as subject through pure apperception and the way I am given to myself as an object of inner sense. This tension remains problematic in the realm of theoretical cognition but can be put to work and made productive in terms of practical self-knowledge.     

Self-talk: Review and sport-specific model

Self-talk is a key component of the sport psychology canon. Although self-talk has been widely endorsed by athletes and coaches as a performance enhancement strategy, a comprehensive model of self-talk in sport that might be used to guide systematic research has yet to be developed. This purpose of this paper is to: (a) review theory and research related to self-talk in sport; and (b) present a sport-specific model that builds upon existing theory and research, and addresses key questions related to self-talk. The paper begins with a definition of self-talk, developed with consideration of the discursive nature of inner speech and dual process theories. Extant self-talk models related to self-talk in sport are reviewed and serve as a foundation for a sport-specific model of self-talk. Components of the model (i.e., self-talk, System 1, System 2, behaviour, contextual factors, personal factors) are presented, the reciprocal relationships among model components are explored, and implications of the sport-specific model of self-talk are discussed.