1. Blackouts common, causes numerous, by Anita Srikameswaran (Post-Gazette Staff Writer). 2. The hypothesis would be; Blackouts are caused by vasovagal reflex (what happens when a needle needs to be inserted into the skin to draw blood). 3. The independent variable would be the vasovagal reflex. 4. The dependent variable would be the percentage of blackouts caused by vasovagal reflex the independent variable. 5. This article has many control groups: Seizures which is caused by overactivity of neurons in the …showed first 75 words of 289 total…

…showed last 75 words of 289 total…people with hypoglycemia and do these tests more than once. Also, conducts these tests with people who do not blackout or have never had any episodes of fainting spells to see their condition of their heart. The people could be babies, teenagers, children, young adults, older adults, and those with fainting spells. Ways to improve the accuracy of the results would be to have a majority of diverse people with good and bad heart problems.