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A Step to VAR: The Vision Science of Offside Calls by Video Assistant Referees

The Video Assistant Referee (VAR) system has had a major impact on decision-making in professional association football. However, offside decisions remain a major area of dispute and debate, with over 34 goals ruled out in the first season of VAR in the Premier League. Evidence in vision science poi...

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Detalles Bibliográficos
Autor principal: Mather, George
Formato: Online Artículo Texto
Lenguaje:English
Publicado: SAGE Publications 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7734242/
https://www.ncbi.nlm.nih.gov/pubmed/33183153
http://dx.doi.org/10.1177/0301006620972006
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author Mather, George
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description The Video Assistant Referee (VAR) system has had a major impact on decision-making in professional association football. However, offside decisions remain a major area of dispute and debate, with over 34 goals ruled out in the first season of VAR in the Premier League. Evidence in vision science points toward two problems with the application of the offside law in VAR, due to their use of a live TV video feed in reviews. First, due to physical and perceptual limits on spatial resolution, there is a significant probability that the spatial positions of the ball and players as judged by VAR will be several centimetres to one side of their true positions. Second, the 50 Hz TV update rate means that judgements of the time-of-contact between player and ball will on average be 10 ms too late, which translates into an increased likelihood of offside calls in fast-moving play. Suggestions are made for how to compensate for these problems during decision-making.
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spelling pubmed-77342422021-01-08 A Step to VAR: The Vision Science of Offside Calls by Video Assistant Referees Mather, George Perception Short and Sweet The Video Assistant Referee (VAR) system has had a major impact on decision-making in professional association football. However, offside decisions remain a major area of dispute and debate, with over 34 goals ruled out in the first season of VAR in the Premier League. Evidence in vision science points toward two problems with the application of the offside law in VAR, due to their use of a live TV video feed in reviews. First, due to physical and perceptual limits on spatial resolution, there is a significant probability that the spatial positions of the ball and players as judged by VAR will be several centimetres to one side of their true positions. Second, the 50 Hz TV update rate means that judgements of the time-of-contact between player and ball will on average be 10 ms too late, which translates into an increased likelihood of offside calls in fast-moving play. Suggestions are made for how to compensate for these problems during decision-making. SAGE Publications 2020-11-13 2020-12 /pmc/articles/PMC7734242/ /pubmed/33183153 http://dx.doi.org/10.1177/0301006620972006 Text en © The Author(s) 2020 https://creativecommons.org/licenses/by-nc/4.0/ This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).
spellingShingle Short and Sweet
Mather, George
A Step to VAR: The Vision Science of Offside Calls by Video Assistant Referees
title A Step to VAR: The Vision Science of Offside Calls by Video Assistant Referees
title_full A Step to VAR: The Vision Science of Offside Calls by Video Assistant Referees
title_fullStr A Step to VAR: The Vision Science of Offside Calls by Video Assistant Referees
title_full_unstemmed A Step to VAR: The Vision Science of Offside Calls by Video Assistant Referees
title_short A Step to VAR: The Vision Science of Offside Calls by Video Assistant Referees
title_sort step to var: the vision science of offside calls by video assistant referees
topic Short and Sweet
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7734242/
https://www.ncbi.nlm.nih.gov/pubmed/33183153
http://dx.doi.org/10.1177/0301006620972006
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