Retrospective protocols in usability testing: a comparison of Post-session RTA versus Post-task RTA reports

We present the results of a study that compared two placements of the Retrospective Think-aloud (RTA): A Post-session RTA where the think-aloud occurs after all tasks are complete, and a Post-task RTA where the think-aloud is elicited after each task. Data from task performance and verbal measures were collected from 24 participants. The results suggest that in terms of task performance, participants in the Post-session RTA condition performed tasks faster, with fewer errors and fewer clicks than in the Post-task RTA condition. In terms of utterances, participants in the Post-task RTA condition produced significantly more utterances that explained actions, expectations and procedural descriptions than in the Post-session RTA condition

Lateralization of the perception of emotional intonation in children with nonverbal learning disabilities

The purpose of the present study was to examine whether lateralization patterns for verbal and nonverbal material and behavioral presentations differ between children categorized as having a verbal (VLD) or nonverbal based learning disability (NLD). Based on their poor visual spatial skills and reported difficulties in social perception it was predicted that NLD children would be less lateralized with regards to nonverbal stimuli (emotional and musical) and more at risk for social problems and internalizing disorders than the VLD group. In the present study the expected left ear advantage (LEA) for nonverbal material was not found in any groups while a significant right ear advantage (REA) for verbal material was found in all but the VLD group. Contrary to predictions, NLD children demonstrated the highest lateralization scores for musical stimuli. No other signiEcant differences in lateralization scores were found. W ith regards to behavior, a trend toward lower social skills was reported in NLD as compared to the control children. Reasons for the lack of expected ear advantages for nonverbal material and future directions for the study of social behavior in NLD children are discussed

Assessing the outcomes of a clinical trial: Primary outcome measures only tell part of the story

Identifying outcome measures that are sensitive to change and meaningful to participants is a challenge when designing clinical trials of complex communication interventions. Outcome measures encompassing participants’ perceptions of clinically meaningful change and their experience of the treatment process are frequently neglected. This paper presents an overview of the outcome measures used in a 3 arm clinical trial which aimed to investigate (i) social skills training for the person with TBI alone (which we have termed the TBI SOLO condition) and (ii) training communication partners to deal with difficult communication behaviors (the JOINT condition) compared to a delayed waitlist CONTROL condition. The paper asks two research questions: 1. What information did the self-report of perceived communication ability using the La Trobe Communication Questionnaire, and qualitative measures provide in addition to blinded ratings on the Adapted Kagan Scales, the primary outcome measure? 2.How did participants perceive the training experience as measured through post treatment interviews

Communication skills of people with severe traumatic brain injury can be improved by training everyday communication partners: Findings from a single-blind multi-centre clinical trial

This controlled group comparison study examined the effectiveness of everyday communication partner (ECP) training for people with TBI. 44 participants with severe TBI and their ECPs were allocated to a) TBI SOLO group where the person with TBI was trained; b) JOINT group where the communication partner was also trained; or c) a delayed CONTROL. Conversations were videotaped pre and post training and rated by two blind assessors on conversational skills. Training ECPs was more efficacious than training the person with TBI alone. Involving communication partners in treatment appears crucial for improved communication interactions for people with severe TBI

Reprint of “The Single-Case Reporting Guideline In BEhavioural interventions (SCRIBE) 2016: explanation and elaboration”

There is substantial evidence that research studies reported in the scientific literature do not provide adequate information so that readers know exactly what was done and what was found. This problem has been addressed by the development of reporting guidelines which tell authors what should be reported and how it should be described. Many reporting guidelines are now available for different types of research designs. There is no such guideline for one type of research design commonly used in the behavioral sciences, the single-case experimental design (SCED). The present study addressed this gap. This report describes the Single-Case Reporting guideline In BEhavioural interventions (SCRIBE) 2016, which is a set of 26 items that authors need to address when writing about SCED research for publication in a scientific journal. Each item is described, a rationale for its inclusion is provided, and examples of adequate reporting taken from the literature are quoted. It is recommended that the SCRIBE 2016 is used by authors preparing manuscripts describing SCED research for publication, as well as journal reviewers and editors who are evaluating such manuscripts.Published versio

Measuring the effect of Think Aloud Protocols on workload using fNIRS

The Think Aloud Protocol (TAP) is a verbalisation technique widely employed in HCI user studies to give insight into user experience, yet little work has explored the impact that TAPs have on participants during user studies. This paper utilises a brain sensing technique, fNIRS, to observe the effect that TAPs have on participants. Functional Near-Infrared Spectroscopy (fNIRS) is a brain sensing technology that offers the potential to provide continuous, detailed insight into brain activity, enabling an objective view of cognitive processes during complex tasks. Participants were asked to perform a mathematical task under 4 conditions: nonsense verbalisations, passive concurrent think aloud protocol, invasive concurrent think aloud protocol, and a baseline of silence. Subjective ratings and performance measures were collected during the study. Our results provide a novel view into the effect that different forms of verbalisation have on workload during tasks. Further, the results provide a means for estimating the effect of spoken artefacts when measuring workload, which is another step towards our goal of proactively involving fNIRS analysis in ecologically valid user studies

Sargassum sp. Act as a Large Regional Source of Marine Dissolved Organic Carbon and Polyphenols

Dissolved organic carbon (DOC) plays critical roles in marine carbon cycling, but its sources and sinks remain uncertain. In this study, we monitored DOC exudation rates of Sargassum natans under visible light (lambda > 390 nm) and solar radiation. DOC release rates ranged from 7 to 10 mu g C g(biomass)(-1) hr(-1) (wet weight) under visible light, but increased to 23 to 41 mu g C g(biomass)(-1) hr(-1) when exposed to natural sunlight. Results indicate that DOC released by Sargassum could amount to 0.3 to 1.2 Tg C/year, potentially contributing significantly to the marine DOC pool in the Gulf of Mexico and Western North Atlantic. We employed the Folin-Ciocalteu phenolic content method, nuclear magnetic resonance (NMR) spectroscopy, and ultrahigh resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) to characterize the diverse pool of organic compounds exuded from Sargassum. Results from these complementary methods showed that Sargassum release large quantities of phlorotannins, a class of polyphenols that have very similar properties to terrestrial DOC. These phlorotannins and their oxygenated phenolic derivatives exhibit a high hydrogen deficiency and functionalization (i.e., 4 to 6 oxygen atoms per aromatic ring), representing 5 to 18% of the released DOC isolated by solid phase extraction. Thus, Sargassum is the largest biological source of open ocean polyphenols recorded to date. The amount of polyphenolic DOC released by Sargassum challenges previous beliefs that all polyphenols found within the oceans are remnants of terrestrial organic matter, although the stability of phlorotannins and their derivatives needs to be further evaluated

Inter-rater reliability of the Measure of Support in Conversation and Measure of Participation in Conversation (Kagan et al., 2004) adapted for people with Traumatic Brain Injury (TBI) and their communication partners

Aim: This study reports inter-rater reliability of the Adapted Measure of Support in Conversation (MSC) and Measure of Participation in Conversation (MPC) for TBI interactions. Method: The MSC and MPC were adapted to reflect theoretical models of cognitive-communication support for people with TBI. 10 casual and 10 purposeful TBI interactions were independently rated. Results: Strong inter-rater agreement was established on the MSC (ICC = 0.85-0.97) and the MPC (ICC = 0.85-0.97). All ratings scored within 0.5 on a 9 point scale. Conclusion: This is the first scale to measure the communication partner during TBI interactions. It shows promise in evaluating communication partner training programs