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How PhD assessment needs to change

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Person coughing into their elbow while in bed.

The field of audiomics combines artificial intelligence tools with human sounds, such as a coughs, to evaluate health.Credit: Getty

A machine-learning tool shows promise for detecting COVID-19 and tuberculosis from a person’s cough. While previous tools used medically annotated data, this model was trained on more than 300 million clips of coughing, breathing and throat clearing from YouTube videos. Although it’s too early to tell whether this will become a commercial product, “there’s an immense potential not only for diagnosis, but also for screening” and monitoring, says laryngologist Yael Bensoussan.

Nature | 5 min read

Reference: arXiv preprint (not peer reviewed)

Everyone knows that usually, when it comes to charged particles, opposites attract. But in liquids, birds of a feather can flock together. Researchers investigating the long-standing mystery of why like-charged particles in solution can be drawn to each other have found that the nature of the solvent is key. The way that the liquid molecules arrange themselves around the particles can generate enough ‘electrosolvation force’ to overcome electromagnetic repulsion. The findings might require “a major re-calibration of basic principles that we believe govern the interaction of molecules and particles, and that we encounter at an early stage in our schooling,” says physical chemist and co-author Madhavi Krishnan.

Physics World | 6 min read

Reference: Nature Nanotechnology paper

A study of 34 years of online discussions from Usenet to YouTube shows that, when it comes to rude behaviour, people — not platforms — are the root of incivility. Researchers used Google’s artificial-intelligence (AI) ‘toxicity classifier’ to identify “rude, disrespectful or unreasonable” comments. They found that over three decades, longer discussions tend to be more toxic, but heated debates don’t necessarily escalate or drive away participants. “Despite changes in social media and social norms over time, certain human behaviours persist, including toxicity,” says data scientist and co-author Walter Quattrociocchi.

El País | 3 min read

Reference: Nature paper

Reader poll

A bar chart illustrating responses to the question “Do you think PhD assessment needs to change?”

Last week, a Nature editorial argued that the way PhDs are assessed needs to change. Briefing readers largely agree.

“I acknowledge granting a PhD is a messy business — there is no fixed bar that candidates have to meet to successfully defend,” says recently minted physics PhD Kai Shinbrough. He says that more transparency around the process would go a long way to alleviate candidates’ anxieties.

Readers’ suggestions included assessing dissertations in a similar way to grant proposals — in writing, with iterative feedback cycles — or opening theses to public comments. Many felt there should be more emphasis on evaluating PhD projects on their originality, methods and analysis rather than their ‘positive’ or ‘negative’ outcomes.

Others highlighted that assessment shouldn’t be generalized across all academic disciplines with their varying contexts, cultures and histories. “Breathless demands for sweeping innovation in yet another domain of higher education would certainly lead to additional demands on the time and workloads of supervisors” and further disincentivize PhD supervision, says linguist Mark Post.

Several readers felt that their supervisors’ hands-off leadership left them to mostly fend for themselves and missing out on learning important skills, such as grant writing or lab management. “Research should not be a painful or solitary endeavour, it should be a communal effort driven by individuals committed to serving society,” says linguist Izadora Silva Pimenta.

Features & opinion

A massive mouse-embryo map tracks the development of more than 12 million cells as they mature into organs and other tissues. Building these cell atlases typically requires multinational collaborations and lots of cash. But this one was completed in one year by a three-researcher team on a US$370,000 budget. Among the first insights from the data is that the transcriptome (the cells’ set of messenger RNA) changes most dramatically in the hour just after birth: it’s “the most stressful moment in your life”, says geneticist and atlas co-creator Jay Shendure.

Nature | 6 min read

Reference: Nature paper

A casualty of faster-than-light travel and a teenage remnant of Homo sapiens grapple over whether it was all worth it in the latest short story for Nature’s Futures series.

Nature | 6 min read

Song differences too subtle for people to hear are the special spice that make some male zebra finches (Taeniopygia guttata) particularly attractive to females. Researchers used an AI algorithm to analyse various acoustic features and create maps of the songs’ syllables. Female finches preferred songs with wider statistical gaps on these maps — they seem to be harder to learn and therefore indicate the singer’s fitness. How this statistical distance translates into sonic quality isn’t clear yet. “They all sounded like just a regular learned zebra finch on to our ear,” says neuroscientist and study co-author Todd Roberts.

Nature Podcast | 30 min listen

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Primate-behaviour researcher Bing Lin took this photograph of a troop of gelada monkeys (Theropithecus gelada) making their way across Ethiopian highlands under a gathering storm in 2017. It was just one moment of many Lin captured during a year of studying the monkeys whilst living in a tent nearby. It was also the moment that won Nature’s 2022 Working Scientist photo competition. Now, the competition returns. You could see your photo of scientists taking part in their craft — in or out of the lab — published in Nature, plus win a cash prize and a year’s subscription. Find out more information here.

Quote of the day

Biophysicist Esther Osarfo-Mensah says that using AI to help produce summaries of papers might help disseminate research to non-specialists. (Nature Index | 7 min read)

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Bring PhD assessment into the twenty-first century

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A woman holding a cup and saucer stands in front of posters presenting medical research

Innovation in PhD education has not reached how doctoral degrees are assessed.Credit: Dan Dunkley/Science Photo Library

Research and teaching in today’s universities are unrecognizable compared with what they were in the early nineteenth century, when Germany and later France gave the world the modern research doctorate. And yet significant aspects of the process of acquiring and assessing a doctorate have remained remarkably constant. A minimum of three years of independent study mentored by a single individual culminates in the production of the doctoral thesis — often a magisterial, book-length piece of work that is assessed in an oral examination by a few senior academic researchers. In an age in which there is much research-informed innovation in teaching and learning, the assessment of the doctoral thesis represents a curious throwback that is seemingly impervious to meaningful reform.

But reform is needed. Some doctoral candidates perceive the current assessment system to lack transparency, and examiners report concerns of falling standards (G. Houston A Study of the PhD Examination: Process, Attributes and Outcomes. PhD thesis, Oxford Univ.; 2018). Making the qualification more structured would help — and, equally importantly, would bring the assessment of PhD education in line with education across the board. PhD candidates with experience of modern assessment methods will become better researchers, wherever they work. Indeed, most will not be working in universities: the majority of PhD holders find employment outside academia.

It’s not that PhD training is completely stuck in the nineteenth century. Today’s doctoral candidates can choose from a range of pathways. Professional doctorates, often used in engineering, are jointly supervised by an employer and an academic, and are aimed at solving industry-based problems. Another innovation is PhD by publication, in which, instead of a final thesis on one or more research questions, the criterion for an award is a minimum number of papers published or accepted for publication. In some countries, doctoral students are increasingly being trained in cohorts, with the aim of providing a less isolating experience than that offered by the conventional supervisor–student relationship. PhD candidates are also encouraged to acquire transferable skills — for example, in data analysis, public engagement, project management or business, economics and finance. The value of such training would be even greater if these skills were to be formally assessed alongside a dissertation rather than seen as optional.

And yet, most PhDs are still assessed after the production of a final dissertation, according to a format that, at its core, has not changed for at least half a century, as speakers and delegates noted at an event in London last month on PhD assessment, organized by the Society for Research in Higher Education. Innovations in assessment that are common at other levels of education are struggling to find their way into the conventional doctoral programme.

Take the concept of learning objectives. Intended to aid consistency, fairness and transparency, learning objectives are a summary of what a student is expected to know and how they will be assessed, and are given at the start of a course of study. Part of the ambition is also to help tutors to keep track of their students’ learning and take remedial action before it is too late.

Formative assessment is another practice that has yet to find its way into PhD assessment consistently. Here, a tutor evaluates a student’s progress at the mid-point of a course and gives feedback or guidance on what students need to do to improve ahead of their final, or summative, assessment. It is not that these methods are absent from modern PhDs; a conscientious supervisor will not leave candidates to sink or swim until the last day. But at many institutions, such approaches are not required of PhD supervisors.

Part of the difficulty is that PhD training is carried out in research departments by people who do not need to have teaching qualifications or awareness of innovations based on education research. Supervisors shouldn’t just be experts in their field, they should also know how best to convey that subject knowledge — along with knowledge of research methods — to their students.

It is probably not possible for universities to require all doctoral supervisors to have teaching qualifications. But there are smaller changes that can be made. At a minimum, doctoral supervisors should take the time to engage with the research that exists in the field of PhD education, and how it can apply to their interactions with students.

There can be no one-size-fits-all solution to improving how a PhD is assessed, because different subjects often have bespoke needs and practices (P. Denicolo Qual. Assur. Educ. 11, 84–91; 2003). But supervisors and representatives of individual subject communities must continue to discuss what is most appropriate for their disciplines.

All things considered, there is benefit to adopting a more structured approach to PhD assessment. It is high time that PhD education caught up with changes that are now mainstream at most other levels of education. That must start with a closer partnership between education researchers, PhD supervisors and organizers of doctoral-training programmes in universities. This partnership will benefit everyone — PhD supervisors and doctoral students coming into the research workforce, whether in universities or elsewhere.

Education and training in research has entered many secondary schools, along with undergraduate teaching, which is a good thing. In the spirit of mutual learning, research doctoral supervisors, too, will benefit by going back to school.

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