Find more projects

Stall Catchers, by EyesOnALZ

Main Project Information
Presented By Human Computation Institute
Goal Speed up Alzheimer's research
Task Report stalls, clogged blood vessels, in movies of mice's brains
Where Online only

Help scientists analyze movies from the brain affected with Alzheimer’s - are the blood vessels flowing or stalled?

Today, there is no treatment for Alzheimer's. Together with researchers at Cornell University, we have a goal to change that. We’re focusing on one aspect of the disease: reduced blood flow in the brain. It’s a symptom that has been known for years, but until now, nobody knew why it happens.

Our collaborators recently discovered that stalls (clogged blood vessels in the brain) are responsible for this blood flow reduction in mice with Alzheimer’s. By reducing the number of stalls, the lab was able to restore memory and reduce other cognitive symptoms in mice.

But to fully understand how stalls are contributing to Alzheimer’s and discover potential treatment targets, we need to get through lots of data. We need your keen eyes for that - even the most powerful computer technologies can’t do that accurately enough yet. Without the help of the crowd, this process could take decades.

In Stall Catchers we “catch” stalls by looking at movies from the brain of mice and scoring blood vessels as “flowing” or “stalled”. The game is easy enough to learn, and we help you out in the beginning! And even if you get a couple of questions wrong - don’t worry. Each vessel will be seen by other citizen scientists so we can figure out the right answers together.

With your help, we could potentially find an effective treatment for Alzheimer's disease in just a few years - quick enough to make a difference in the lives of people who have the disease now.

How to Join

Go to and click ‘Join now’.

Social Media
Android App URL
Special Skills Finding stalls is quick and easy and one could spend just a few minutes at a time on this while standing in line at the grocery store, though some people like to do this for longer periods.
Ideal Age Group Elementary school (6 - 10 years), Middle school (11 - 13 years), High school (14 - 17 years), College, Graduate students, Adults, Families, Seniors
Ideal Frequency Per week
Average Time Less than an hour
Spend the Time indoors
Type of Activity Exclusively online, While fishing, In the car, At home, At school, At night, At sports stadiums
Training Materials
Media Mentions
and Publications
Tags alz, alzheimer, alzheimer's disease, biomedical, blood vessels, brain, catchers, cell biology, circulation, circulatory system, citsci4alz, citscibio, citscigames, citscitrophy, classification, cognitive, crowdcloud, crowdpower, crowdsourcing, crushalz, cure, curriculum, dementia, disease, drugdiscovery, education, endalz, eyesonalz, gamers, games4good, gaming, hcomp, health, humancomputation, human computation institute, image recognition, informal learning, machine learning, middle school, neuroscience, online, online game, science learning, sofa projects, stallcatchers, stalls, steam, stem, visual skills
Project Updated 02/23/2019