While reading about George Sperling's research investigating visual sensory storage, Umar is surprised to find out that one particular factor caused a significant decline in participants' ability to remember what was seen. What was this factor?

a longer delay between when participants saw the 3 rows and when they had to report one of them.

Explanation:The longer the time it takes for us to be asked to recall information the high the chance of it to be no longer exact as how we restored it. Our memories are easily manipulated by many different factors such as what we saw after that memory or what we have heard after that or just the time alone, the longer we stay with the infomation the less likely it is for us to recall it as it is.

you should try adrenaline. it kicks in in situations like this.

could you go a bit more in depth with you question? it's quite hard to understand. as soon as you do that i will be glad to : )