Google is a terrible tool to find scientific research. Rather use Google Scholar (https://scholar.google.com) or some of the fancy new AI-assisted literature survey tools such as Elicit (https://elicit.org). I used both to find these result:
- Gen Z and Millennials in the Workplace: How are Leaders Adapting to their Short Attention Span and How Will they Keep them from Leaving a Qualitative Study (https://digitalcommons.fiu.edu/etd/4800/)
- Short-term mindfulness intervention reduces the negative attentional effects associated with heavy media multitasking (https://doi.org/10.1038/srep24542)
- Caught in the Loop: The Effects of The Addictive Nature Of Short-form videos On Users’ Perceived Attention Span And Mood (http://essay.utwente.nl/95551/)
Disclaimer: this is not my field, and I only spent 15 minutes on this, so these may not be the best articles around. On the other hand, the post seems to mention quite a lot of research on this topic, so you could read that, too. To read more, check articles that cite, or were cited by, these. Also, for obvious reasons, there does not seem to be many studies available on long term effects.
- The effect of daily internet usage on a short attention span and academic performance (https://monami.hs-mittweida.de/frontdoor/deliver/index/docId...)
- Enhancing Cognitive Performance in Children by Decreasing Screen Time and Increasing Art Activities (https://www.proquest.com/openview/8f41dc5ed9fff23842acf88b16...)
- Gen Z and Millennials in the Workplace: How are Leaders Adapting to their Short Attention Span and How Will they Keep them from Leaving a Qualitative Study (https://digitalcommons.fiu.edu/etd/4800/)
- Does Media Use Have a Short-Term Impact on Cognitive Performance? (https://doi.org/10.1027/1864-1105%2Fa000038)
- Short-term mindfulness intervention reduces the negative attentional effects associated with heavy media multitasking (https://doi.org/10.1038/srep24542)
- Influence of Short Video Watching Behaviors on Visual Short-Term Memory (https://doi.org/10.2991/assehr.k.211220.314)
- Attention switching and working memory spans (https://doi.org/10.1080/09541440440000014)
- Caught in the Loop: The Effects of The Addictive Nature Of Short-form videos On Users’ Perceived Attention Span And Mood (http://essay.utwente.nl/95551/)
Disclaimer: this is not my field, and I only spent 15 minutes on this, so these may not be the best articles around. On the other hand, the post seems to mention quite a lot of research on this topic, so you could read that, too. To read more, check articles that cite, or were cited by, these. Also, for obvious reasons, there does not seem to be many studies available on long term effects.