Improvisation and Communicative Agency: Contribution of an Improvisational Model to the Analysis of Communicative Agency

Introduction: Persons with congenital deafblindness mainly communicate using the bodily tactile modality. Their expressive communication is often formulated by an authentic language that gives the persons with congenital deafblindness low readability towards the rest of the world. This can be an obstacle for the development of their communicative agency. In the present study it is investigated whether a theoretical approach to improvisation can contribute to the development of communicative agency in a person with congenital deafblindness with low readability and authentic language in a dialogical perspective. Method: The study employs a qualitative design conducted as a dialogical single case study. Even though this research is based only on one recording of a communicative encounter between a person with deafblindness and her communication partner, it is assumed that the study can be used as a representative case study for people with low readability and authentic language. A video of communication between a person with CDB and a sighted/hearing communication partner is transcribed and the transcription is analysed in three stages through 1) Conversational analysis (CA), 2) Improvisation analysis and 3) Subjectivity/intersubjectivity analysis. Results: The Conversation analysis proved useful to identify complex turn-taking patterns in the communication. Through the improvisation model it was possible to define the degree of subjectivity/intersubjectivity in every utterance by each participant, as well as how each act was met by the other. With the improvisation model discriminations could be made between the different modalities, as vocal speech and bodily tactile acts. Regarding communicative agency, the model was useful to analyze degrees of self-expression as well as the balance of subjectivity and intersubjectivity between the participants. Conclusion and discussion: The model of improvisation contributed to specify subjectivity/intersubjectivity and multimodality in communication, though it did not contribute to the analysis of turn-taking. The model contributed to the development of communicative agency by pointing to the open-ended outcome for each utterance as the most important factor for developing and sustaining communicative agency. Limitations: The main limitation of this study was that the analyses were performed on only one video-clip with one dyad. Due to time constraints, a consensus check could not be carried out. Recommendations for future research is that, since this is a very innovative method in the deafblind field, replications of the study should be performed on more dyads, different dialogues and more video clips. Recommendation for practice: The combination of conversation analysis and improvisation analyses can very well be used with focus groups of care professionals in clinical practice under supervision of a trained expert in this method of communication analyses.

Cognition in Interaction: Challenges in Assessing Persons with Sensory and Multiple disabilities

This article reports a qualitative study of cognitive assessments of three teenagers with sensory and multiple disabilities, including moderate to profound developmental disability. The aim was to evaluate the possibilities for adapting standardized tests and the implementation of interactional partnership in assessment. Cognitive assessments were made with an individually-adapted psychological assessment tool, the Bayley Scales of Infant and Toddler Development. The assessment situations were video-recorded and analyzed based on sociocultural theories of early interaction, dynamic assessment, and the bodily-tactile modality of cognition. The results showed that the requirements for assessment are complex and highly individualized, extending beyond universal guidelines on test adaptations. The assessments were built on developmental steps within the standardized test, but required a special emphasis on individuality and interaction. We conclude that the study provides novel insights into an under-researched area of cognitive assessment, confirming earlier findings that cognitive skills become observable in unique moments of intensive interaction. The assessor must follow the principles of dynamic assessment, applying competent partner strategies such as providing safety, supporting attention, activity, and alertness, and scaffolding the target skills in the zone of proximal development. Conducted thus, the cognitive assessment process can enable the assessor to recognize, support and authenticate the agency of persons with complex disabilities.

Crossmodal metaperception: Visual and tactile confidence share a common scale

Perceptual decisions are typically accompanied by a subjective sense of (un)certainty. There is robust evidence that observers have access to a reliable estimate of their own uncertainty and can judge the validity of their perceptual decisions. However, there is still a debate to what extent these meta-perceptual judgements underly a common mechanism that can monitor perceptual decisions across different sensory modalities. It has been suggested that perceptual confidence can be evaluated on an abstract scale that is not only task-independent but also modality-independent. We aimed to scrutinize these findings by measuring visual contrast and tactile vibration discrimination thresholds in a confidence forced-choice task. A total of 56 participants took part in our study. We determined thresholds for trials in which perceptual decisions were chosen as confident and for those that were declined as confident. Confidence comparisons were made between perceptual decisions either within the visual and tactile modality, respectively, or across both modalities. Furthermore, we assessed executive functions to explore a possible link between cognitive control and meta-perceptual capacities. We found that perceptual performance was a good predictor of confidence judgments and that the threshold modulation was similarly pronounced in both modalities. Most importantly, participants compared their perceptual confidence across visual and tactile decisions with the same precision as within the same modality. Cognitive control capacities were not related to meta-perceptual performance. In conclusion, our findings corroborate that perceptual uncertainty can be accessed on an abstract scale, allowing for confidence comparisons across sensory modalities.

Tapping Force Encodes Metrical Aspects of Rhythm

Humans possess the ability to extract highly organized perceptual structures from sequences of temporal stimuli. For instance, we can organize specific rhythmical patterns into hierarchical, or metrical, systems. Despite the evidence of a fundamental influence of the motor system in achieving this skill, few studies have attempted to investigate the organization of our motor representation of rhythm. To this aim, we studied—in musicians and non-musicians—the ability to perceive and reproduce different rhythms. In a first experiment participants performed a temporal order-judgment task, for rhythmical sequences presented via auditory or tactile modality. In a second experiment, they were asked to reproduce the same rhythmic sequences, while their tapping force and timing were recorded. We demonstrate that tapping force encodes the metrical aspect of the rhythm, and the strength of the coding correlates with the individual’s perceptual accuracy. We suggest that the similarity between perception and tapping-force organization indicates a common representation of rhythm, shared between the perceptual and motor systems.

The rubber hand illusion is a fallible method to study ownership of prosthetic limbs

Enabling sensory feedback in limb prostheses can reverse a damaged body image caused by amputation. The rubber hand illusion (RHI) is a popular paradigm to study ownership of artificial limbs and potentially useful to assess sensory feedback strategies. We investigated the RHI as means to induce ownership of a prosthetic hand by providing congruent visual and tactile stimuli. We elicited tactile sensations via electric stimulation of severed afferent nerve fibres in four participants with transhumeral amputation. Contrary to our expectations, they failed to experience the RHI. The sensations we elicited via nerve stimulation resemble tapping as opposed to stroking, as in the original RHI. We therefore investigated the effect of tapping versus stroking in 30 able-bodied subjects. We found that either tactile modality equally induced ownership in two-thirds of the subjects. Failure to induce the RHI in the intact hand of our participants with amputation later confirmed that they form part of the RHI-immune population. Conversely, these participants use neuromusculoskeletal prostheses with neural sensory feedback in their daily lives and reported said prostheses as part of their body. Our findings suggest that people immune to the RHI can nevertheless experience ownership over prosthetic limbs when used in daily life and accentuates a significant limitation of the RHI paradigm.

Image, or what? an attempt towards a holistic exploration

The following is a proposition paper whose purpose is to try to provide a solid theoretical (modelling) background for research on image generation and image maintenance. As such, it is intentionally devoid of any experimental/empirical findings. And although we agree that model-reasoning is difficult to observe, we nevertheless utterly agree with Rosenblueth and Wiener’s stance according to which ‘scientific knowledge consists of a sequence of abstract models, preferably formal, occasionally material in nature (Rosenblueth/Wiener, 1945,320), who further also stated that ‘the ideal model would be one which would cover the entire universe’ (Rosenblueth/Wiener, 1945,320). We are, of course, convinced that material substance can and should be provided later on as research continues to accrue with reference to the model(s) proposed.General assumptions which are put forth in the paper are the following:1. image is pervasive in nature; in fact, in humans it is more pervasive than language. This is due to the fact that the visual-tactile modality is of fundamental significance in the daily conduct of the human species (see e.g. Fletcher, 1952; Pirenne, 1967; Schiffman, 1982; Gordon, 1989; Sekuler/Blake, 1994).2. Owing to its pervasiveness, image may be approached holistically, that is, it may be likened to life, especially to its exteriorization within the bounds of the material and perceiving/acting human body.3. The paper is based on some general theoretical orientations which may be summarized as the following:– material positivism: within this orientation, the subject matter of research is the universal occurrence of embodiment/entitiation and its consequences, dialectical constructivism: within this orientation, a human agent as an embodied entity/organism is assumed to be involved in a continuous process of constructing and changing images.