Journal:Design of generalized search interfaces for health informatics

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Full article title Design of generalized search interfaces for health informatics
Journal Information
Author(s) Demelo, Jonathan; Sedig, Kamran
Author affiliation(s) Western University
Primary contact Email: sedig at uwo dot ca
Editors Almada, Marta
Year published 2021
Volume and issue 12(8)
Article # 317
DOI 10.3390/info12080317
ISSN 2078-2489
Distribution license Creative Commons Attribution 4.0 International
Website https://www.mdpi.com/2078-2489/12/8/317/htm
Download https://www.mdpi.com/2078-2489/12/8/317/pdf (PDF)

Abstract

In this paper, we investigate ontology-supported interfaces for health informatics search tasks involving large document sets. We begin by providing background on health informatics, machine learning, and ontologies. We review leading research on health informatics search tasks to help formulate high-level design criteria. We then use these criteria to examine traditional design strategies for search interfaces. To demonstrate the utility of the criteria, we apply them to the design of the ONTology-supported Search Interface (ONTSI), a demonstrative, prototype system. ONTSI allows users to plug-and-play document sets and expert-defined domain ontologies through a generalized search interface. ONTSI’s goal is to help align users’ common vocabulary with the domain-specific vocabulary of the plug-and-play document set. We describe the functioning and utility of ONTSI in health informatics search tasks through a workflow and a scenario. We conclude with a summary of ongoing evaluations, limitations, and future research.

Keywords: information search, search tasks, health informatics, interface design, ontologies, machine learning, PubMed

Introduction

Health informatics is concerned with emergent technological systems that improve the quality and availability of care, promote the sharing of knowledge, and support the performance of proactive health and wellness tasks by motivated individuals.[1] Subareas of health informatics may include medical informatics, nursing informatics, consumer informatics, cancer informatics, and pharmacy informatics, to name a few. Simply put, health informatics is concerned with harnessing technology for finding new ways to help stakeholders work with health information to be able to perform health-related tasks more effectively.

Users in the health domain are increasingly taking advantage of computer-based resources in their tasks. For instance, a 2017 Canadian survey found that 32% of respondents within their last month had used at least one mobile application for health-related tasks. Even more, those under the age of 35 are twice as likely to do so.[2] Furthermore, studies have calculated that over 58% of Americans have used tools like Google and other domain-specific tools to support their health informatics search tasks, with search being one of the most important and central tasks in most health informatics activities.[3][4]

Yet, search can be challenging, particularly for health informatics tasks that utilize large and complex document sets. For such tasks, health informatics tools may require the use of domain-specific vocabulary. Aligning with this vocabulary can be a significant challenge within health tasks, as they can involve a lexicon of intricate nomenclature, deeply layered relations, and lengthy descriptions that are misaligned with common vocabulary. For instance, one highly cited medical research paper defines the term “chromosomal instability” as “an elevated rate of chromosome mis-segregation and breakage, results in diverse chromosomal aberrations in tumor cell populations.” In this example, those unfamiliar with the defined term could find parsing its definition just as significant a challenge as the term itself.[5] Thus, when communicating across vocabularies, users may struggle to describe the requirements of their search task in a way that is understandable by health informatics tools.[6][7] To deal with this challenge, ontologies can be a valuable mediating resource in the design of user-facing interfaces of health informatics tools.[8] That is, ontologies can bridge the vocabularies of users with the vocabulary of their task and its tools. Yet, the use of ontologies in user-facing interface design is not well established. Furthermore, health informatics tools that present a generalized interface, one that can support search tasks across any number of domain vocabularies and document sets, can allow users to transfer their experience between tasks, presenting users with information-centric perspectives during their performances rather than technology-centered perspectives.[9][10] For this, there is a need to distill criteria that can guide designers during the creation of ontology-supported interfaces for health informatics search tasks involving large document sets.

The goal of this paper is to investigate the following research questions:

  • What are the criteria for the structure and design of generalized ontology-supported interfaces for health informatics search tasks involving large document sets?
  • If such criteria can be distilled, can they then be used to help create such interfaces?

In this paper, we examine health informatics, machine learning, and ontologies. We then review leading research on health informatics search tasks. From this analysis, we formulate criteria for the design of ontology-supported interfaces for health informatics search tasks involving large document sets. We then use these criteria to contrast the traditional design strategies for search interfaces. To demonstrate the utility of the criteria in design, we will use them to structure the design of a tool, ONTSI (ONTology-supported Search Interface). ONTSI allows users to plug-and-play their document sets and expert-defined ontology files to perform health informatics search tasks. We describe ONTSI through a functional workflow and an illustrative usage scenario. We conclude with a summary of ongoing evaluation efforts, future research, and our limitations.[11]

Background

In this section, we describe the concepts and terminology used when discussing ontology-supported interfaces for health informatics search tasks involving large document sets. We begin with background on health informatics. Next, we examine machine learning. We conclude with coverage of ontologies and their utility as a mediating resource for both human- and computer-facing use.

Health informatics

Health informatics is broadly concerned with emergent technological systems for improving the quality and availability of care, promoting the sharing of knowledge, and supporting the performance of proactive health and wellness practices by motivated individuals.[1] Initially, the need for expanded health and wellness services stemmed from rising population levels combined with the growing complexity of medical sciences. These issues made it challenging to maintain quality care within increasingly stressed medical systems.[12] Thus, a central objective for health informatics is the development of strategies to tackle large-scale problems that harm trained medical professionals’ ability to perform their tasks in a timely and effective manner. For instance, telehealth services allowed doctors to practice remote medicine, providing care to those without local medical services. Another early innovation was standardized electronic health care records (EHRs), where patient records were given standardized encodings to provide an increased ability to track, compare, manage, and share personal health information.[3] Some examples of current research directions are the push for stronger patient privacy, personalized medicine, and the expansion of healthcare into underserved regions and communities.[1][2][3][13][14]

The rising production and availability of health-related data has resulted in a growing number of data-intensive tasks within health. Both private and public entities like health industry companies, government bodies, and everyday citizens are turning to health informatics tools as they manage and activate their health data.[2] A growing number of health-related tasks involve searching document sets. During these tasks, the aim of the user is to use the information described within their document set to increase their understanding of a topic or concept. For example, a search task could be a practitioner searching the EHRs of their patients, a member of the general public using public materials for their general health concerns, or a researcher performing a literature review.[12][15][16] In general, a search task involves the generation of a query based on an information-seeking objective. The computation systems of these tools then use this query to map and extract relevant documents out from the document set.[15] Powerful technologies like machine learning are increasingly being integrated within tools to help perform rapid and automated computation on document sets.[4] Yet, when taking advantage of these technologies, designers must be mindful of human factors when generating the user-facing interfaces of their tools, as a task cannot be performed effectively without direction from an empowered user.[12]

Machine learning

Machine learning techniques are increasingly being utilized to tackle analytic problems once considered too complex to solve in an effective and timely manner.[16] Yet, recent analysis[17][18][19] on the human factors in machine learning environments have found that the current design strategies continually limit users’ ability to take part in the analytic process. More so, it has produced a generation of machine learning-integrated tools that are failing to provide users a complete understanding on how computational systems of their tools arrive at their results. This has significantly reduced users’ control and lowered the ability to achieve task objectives. In response, there is a growing desire to promote the “human-in-the-loop,” bringing the benefits of human reasoning back to the forefront of the design process.[20][21][22]

When considering the interaction loop of a machine learning-integrated tool, Sacha et al.[23] present a five-stage conceptual framework: producing and accessing data, preparing data for tool use, selecting a machine learning model, visualizing computation in the tool interface, and users applying analytic reasoning to validate and direct further use. Assessing this framework, a machine learning-integrated search tool must provide users with a functional workflow where:

  1. users communicate their task requirements as a query;
  2. users ask their tool to apply that query as input within its computational system;
  3. the tool performs its computation, mapping the features against the document set;
  4. the tool represents the results of the computation in its interface;
  5. users assess whether they are or are not satisfied with the results; and
  6. users restart the interaction loop with adjustments or conclude their use of the tool.

Thus, a primary responsibility for users within machine learning environments is the need to assess how well the results of machine learning have aligned with their task objectives. A systematic review by Amershi et al.[24] suggests six considerations for the user’s role in arbitrating machine learning performance:

  • Users are people, not oracles (i.e., they should not be expected to repeatedly answer whether a model is right or wrong).
  • People tend to give more positive than negative feedback.
  • People need a demonstration of how machine learning should behave.
  • People naturally want to provide more than just data labels.
  • People value transparency.
  • Transparency can help people provide better labels.

Ontologies

In search tasks involving large document sets, many challenges can arise that reduce performance quality, harm user satisfaction, and increase the time for task completion.[17][18][19] Often, these challenges result from misalignment between the vocabularies used by the document sets, storage maintainers, interface designers, and users. For instance, Qing et al.[25] outline the difficulties faced when translating between common and domain vocabularies in health tasks. They describe a study that found that up to 50% of health expressions by consumers were not represented by public health vocabularies.[25]

Within the pipeline of a search task, both the human and computational system can only perform optimally if communication is strong.[26] Ontologies are representational artifacts that reflect the entities, relations, and structures of its domain. Ontologies are of three types: a philosophical ontology for describing and structuring reality, a domain ontology for structuring the entities and relations of a knowledge base, and a top-level ontology for interfacing between different domain ontologies.[26] Ontologies provide the flexibility, extensibility, generality, and expressiveness necessary to bridge the gap when mapping domain knowledge for effective computer-facing and human-facing use.[8] For this purpose, ontologies are increasingly being used within tools to help users perform their challenging search tasks.[27][28][29][30][31]

When creating an ontology, experts construct a network of entities and relations, which together yield various structures.[32][33] Ontology entities reflect the objects of the domain, like a phenotype in a medical abnormality ontology, a processor in a computer architecture ontology, or a precedent in a legal ontology.[34] In some ontologies, like the top-level ontology, Basic Formal Ontology, designers go as far as denoting qualities such as materiality, object composition, and spatial qualities in reality.[26] Ontology entities are encoded with information about their role in the vocabulary, definitions, descriptions, and contexts, as well as metadata that can inform the performance of future ontology engineering tasks.

Ontology relations are the links between ontology entities that express the quality of interaction between them and the domain as a whole.[35] When assessing ontology relations, Arp et al.[26] distinguish relations under the categories of universal–universal (dog “is_a” animal), particular–universal (this dog “instance_of” dog), and particular–particular (this dog “continuant_parts” of this dog grouping). Domain ontology relations are realized through unique interoperability between ontology entities. For instance, an animal ontology may have an ontology entity reflecting the concept of a “human,” which may have the ontology relations “domesticates/is domesticated by” between it and the “dog” ontology entity.

After defining the entities, relations, and other features of an ontology, experts record their work in ontology files of standardized data formats like RDF, OWL, and OBO. These ontology files are then distributed amongst users. They can then be integrated into the computational and human-facing systems of tools for use during tasks. Some examples of current ontology use are information extraction on unstructured text, behavior modeling of intellectual agents, and an increasing number of human-facing visualization tasks such as decision support systems within critical care environments.[20][21][22]


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Notes

This presentation is faithful to the original, with only a few minor changes to presentation. Some grammar and punctuation was cleaned up to improve readability. In some cases important information was missing from the references, and that information was added.