phelimb @phe-lim.bsky.social · 09/09/2026Today we launched The Signal, Prolific's new podcast on research evidence, not research tools or trends. David and Andrew discussed what research quality looks like once you remove the human from the process. Give it a watch! 011
phelimb @phe-lim.bsky.social · 08/09/2026Our team recently tested whether AI can replace human survey respondents, using simulated LLM personas against a real US survey (N = 996). Turns out demographic personas make it worse, idiographic information helps a little, and output format is the biggest lever of all. 1/2 100
phelimb @phe-lim.bsky.social · 24/08/2026Can an LLM fake being a human survey respondent? We tested it on 996 real people using a poll plus a 10-minute qualitative interview (via Outset). New paper: "Do Richer Personas Improve LLM Survey Simulation? A Fidelity Paradox" 111
phelimb @phe-lim.bsky.social · 01/07/2026When we started @joinprolific.bsky.social, we were motivated by the question "what if MTurk was actually good"? It's sad to see Mturk closing it's doors, but it's not a surprise. It’s the result of years of degrading data quality and an unhealthy marketplace. 121
phelimb @phe-lim.bsky.social · 18/06/2026Just launched labs.prolific.com. Our AI research team (PAIR) have been busy - working on science of evaluation: how to measure AI systems well, grounded in real human judgement at population scale. Check out the work that’s live, but there’s much more to come!labs.prolific.comProlific AI ResearchProlific AI Research (PAIR) — papers, notes, and field logs on how AI systems are measured through human experience. 000
phelimb @phe-lim.bsky.social · 12/06/2026This one's been a long time coming! Longitudinal projects are live now on @joinprolific.bsky.social, a dedicated way to run multi-wave research from start to finish. 021
phelimb @phe-lim.bsky.social · 05/06/2026Myra Cheng, a @stanford.edu PhD student, has contributed to two important studies on AI sycophancy within months of each other. I think it's worth recognising. Quick thread below: 100
phelimb @phe-lim.bsky.social · 19/05/2026The data quality problem isn't going away anytime soon. About a month ago we announced Prolific's 100% Human Guarantee, but the real work is in the systems that stop threats from getting through in the first place. I've shared more thoughts here: www.prolific.com/resources/ai... 000
phelimb @phe-lim.bsky.social · 21/04/2026Researchers from @harvard.edu find that LLMs claiming "human-like" performance actually reflect a very specific subset of humanity. They cluster closest to WEIRD populations (Western, Educated, Industrialized, Rich, Democratic), diverging as psychological distance increases (r ≈ -0.70) 👇🏻 110
phelimb @phe-lim.bsky.social · 01/04/2026AI pollution in human data samples is a hot topic. Some great work from @andrewgordon.bsky.social et al. showing that concerns here are (generally) overblown, with the majority of platforms empirically showing low levels of AI pollution. osf.io/preprints/ps...osf.ioOSF 031
Reposted by phelimbAndrew Gordon @andrewgordon.bsky.social · 01/04/2026New preprint out today (osf.io/preprints/ps...). We tested whether AI agents are actually infiltrating online surveys. Spoiler alert: they aren't Thread 🧵 [1/9]osf.ioOSF 213162
phelimb @phe-lim.bsky.social · 31/03/2026As of today, if an AI agent is detected in your Prolific study, you'll get twice the cost of that participant back. We’re calling this our 100% Human Guarantee. Years of investing into @joinprolific.bsky.social's system has made us confident in data integrity. www.prolific.com/100-human-gu... 032
phelimb @phe-lim.bsky.social · 30/03/2026New working paper on online research data quality, led by @univie.ac.at, reveals that pass rates on quality checks vary wildly by source. Pretty interesting. Prolific: 90% | Lab: 80% | Bilendi: 73% | Moblab: 55% | MTurk: 9% | AI agents: 0% github.com/survey-data-... CC @jyusof.bsky.social 121
phelimb @phe-lim.bsky.social · 09/03/2026Lots of hard work from the Prolific team to achieve the lowest rate of AI misuse detected in this study. More to do to get this to 0, though! 020
Reposted by phelimbBrendan Nyhan @brendannyhan.bsky.social · 08/03/2026The sky is not falling; high-quality platforms (Prolific, Verasight, CR Connect) have low rates of apparent bots. osf.io/preprints/ps... But also not zero; vigilance is very much needed! 212857
phelimb @phe-lim.bsky.social · 26/02/2026We ran a controlled study of 125 verified humans vs 5 AI agents. Can agents reliably be detected? Here's what we found: www.prolific.com/resources/au...prolific.comAuthenticity checks detect AI agents best | ProlificHow we tested the most accurate method for identifying agentic AI 011
phelimb @phe-lim.bsky.social · 11/02/2026Frontiers episode 1: Jerome Wynne from @Prolific in conversation with Crystal Qian, from Google DeepMind, talking about Deliberate Lab: a platform for running online research experiments on human + LLM group dynamics. www.youtube.com/watch?v=5vyi... 000
phelimb @phe-lim.bsky.social · 04/02/2026AI agents are becoming a serious threat to research data quality. Today we’re rolling out Bot authenticity checks on @joinprolific.bsky.social, detecting agentic AI with 100% accuracy in testing. Comes with a native Qualtrics integration! More info: www.prolific.com/resources/in... 2137
phelimb @phe-lim.bsky.social · 10/12/2025Fresh HUMAINE results are here. Gemini 3 is still first, but Mistral Large 3 and Deepseek v3.2 are making things interesting. Opus 4.5 didn't dominate, but Antropic is likely prioritizing complex reasoning/coding over the conversational fluency that this benchmark favors. prolific.com/humaine 010
Reposted by phelimbAndrew Gordon @andrewgordon.bsky.social · 19/11/2025Lots of chatter about this paper currently. Its a stark warning, but at present I see this as a stark warning of what might come, not what is happening now. As a research community we need to see it as a call-to-arms to develop new strategies, NOT a call to abandon online sampling. Reasoning below 153
phelimb @phe-lim.bsky.social · 19/11/2025Without minimising the seriousness of the threat raised in this paper, I'm more optimistic. This is just the latest challenge in online integrity of online research. We've been proactively adding to our suite of authenticity tools - more every week - including many of Sean's recommendations:prolific.comProlific sets standards for authentic human data collection | ProlificDiscover how Prolific's data quality system, Protocol, sets industry standards for authentic human data collection 1112
