Dimitris Bolis

@dimitrisbolis.bsky.social

Postdoctoral researcher studying social interaction and the self, with a focus on neurosocial minorities. Website: https://sites.google.com/site/dimitrisbolis/

Validating dynamic time warping as a measure of gesture form similarity. New paper by @shoakamine.bsky.social , @dingemansemark.bsky.social & @asliozyurek.bsky.social doi.org/10.3758/s13428-026-02975-5

Validating dynamic time warping as a measure of gesture form similarity - Behavior Research Methods

Dynamic time warping (DTW) is a well-known algorithm used to assess the similarity between signals of varying lengths. Initially developed for automatic speech recognition, DTW has found applications in psycholinguistics, particularly in analyzing gesture form similarity. An open question in this domain is how effectively DTW captures gesture form similarity. Here, we validate DTW against human annotations of gesture form similarity across two multimodal interaction corpora and explore its utility as an automatic, continuous measure of gesture form similarity. Our findings reveal weak to moderate correlations between DTW distance and the number of similar gesture features – such as handshape, movement, orientation, and position – suggesting that DTW serves as a useful proxy for gesture form similarity. Additionally, we highlight the importance of qualitative analysis of raw data and DTW predictions in enhancing DTW’s predictive accuracy. Our study offers a rigorous validation of DTW as a measure of gesture form similarity and presents a detailed framework for preprocessing motion tracking data and calculating DTW distance. While none of the methods is perfect, the combination of automatic and manual measures provides a comprehensive approach to understanding and measuring gesture form similarity.

doi.org

Happy to report that our survey study on the diversity with which people seem to experience their mental imagery is now published in RSOS :) doi.org/10.1098/rsos... I posted a longer thread summarising the findings some months ago when we first put out the preprint: bsky.app/profile/samp...

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Sam Schwarzkopf@sampendu.bsky.social · 10mo ago

Long time in the making: our preprint of survey study on the diversity with how people seem to experience #mentalimagery. Suggests #aphantasia should be redefined as absence of depictive thought, not merely "not seeing". Some more take home msg: #psychskysci #neuroscience doi.org/10.1101/2025...

📢 New preprint from the lab🧠 ▶️doi.org/10.64898/2026.03.12.710517 What does fMRI connectivity actually reflect at the neural level? The natural intuition is: more neural activity = more connectivity! Using cortical perturbations we show this is not necessarily the case: sometimes less is more! 👇🧵

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Using ecological momentary assessment and multilevel timeseries models, this study quantifies loneliness inertia and its links to perceived social threat and social behavior, identifying dynamic patterns that help explain persistence of chronic loneliness. www.nature.com/articles/s44...

Loneliness modulates social threat detection in daily life - Communications Psychology

Using ecological momentary assessment and multilevel time-series models, we quantify loneliness inertia and its links to perceived social threat and social behavior, identifying dynamic patterns that ...

nature.com

How do we deal with rich, multilevel, and multimodal data? In a new preprint, @rachaelkee.bsky.social and I sketch an answer! For all the details, and the preprint link, see Rachael’s thread. Be sure to give her a follow, especially if you’re interested in neuroscience, sleep, and media!

Three-panel infographic illustrating Marr’s Levels of analysis in a study of repeated exposure to crime media.
(a) At the top left, a diagram labeled “Marr’s Levels” shows three stacked boxes: 1. Computation (why / problem) in orange, 2. Algorithm (what / rules) in coral, and 3. Implementation (how / physical) in dark red.
(b) At the top right, an illustration of a person looking at a smartphone surrounded by social media icons, a warning symbol, and a clock, labeled “Repeated exposure to crime media.”
(c) The bottom row maps each level to research methods: Computation shows a person with checklist icons and the text “EMA/ESM surveys, in-app surveys, pop-up questionnaires.” Algorithm shows a smartphone social media interface with the text “Digital trace data, smartphone usage logs, screen time APIs.” Implementation shows a person interacting with a smartwatch and the text “Wearable biometric sensors (e.g., smartwatches, Oura ring), consumer-grade EEG (e.g., MUSE headbands), eyetracking devices (e.g., Gazepoint GP3).”
Rachael Kee@rachaelkee.bsky.social · 5mo ago

🚨 New Preprint Alert 🚨 Communication science has no shortage of data. But what do we do with all of it? Experience sampling, sensors, digital trace, location aware observations are growing in popularity and scale.

"To encompass in research the process of a given thing’s development in all its phases and changes—from birth to death—means to discover its nature, its essence, for it is only in movement that a body shows what it is."

1/6 Excited to share the call for posters & registration for the 2nd XSCAPE Workshop: "Varieties of Externalism" ! 📅 Friday, April 10th, 2026 — Gallery Room, Bramber House, University of Sussex Registration is free but places are limited. 🧵

Poster for the call. All relevant information is in thread