Researcher: Experiences that are accompanied by increased secretions of adrenaline—a hormone produced in situations involving fear—tend to be remembered more clearly than experiences not so accompanied.
Conclusion (thus)
Non-frightening experiences are at least as memorable as frightening experiences.
Evidence
There's a correlation between higher levels of adrenaline and remembering events more clearly.
Adrenaline is produced in situations involving fear.
Evaluate
In this argument, there is a comparative relationship between types of experiences and their memorability, rather than a causal conclusion. The key idea is the correlation between adrenaline and memory. We know that experiences attached to adrenaline are more likely to be remembered.
Given that producing more adrenaline is associated with better memory and fear produces adrenaline, how could we argue that non-frightening experiences are at least as memorable as frightening experiences?
One way could be to suggest that other emotions or states, like excitement or pleasure, also raise adrenaline levels. If true, even non-frightening experiences could be memorable due to the same adrenaline boost.
We could also weaken by saying that there's something ELSE about frightening experiences, like trauma/repression, that makes it less likely that something will be remembered, counteracting the memory boost afforded by adrenaline.
Goal
Let's find an answer that posits other sources or situations that trigger adrenaline, thereby challenging the assumption that frightening experiences have the inside track to being memorable due to adrenaline, or an answer that tells us there's some component of frightening experiences that actually undermines the ability to remember them.