If you are like most people, you were probably taught in your high school English classes that it is not okay to use the passive voice when writing.
The passive voice is that in which the subject of a sentence receives an action, while in the active voice, the subject performs the action.
An example of the difference between the active and passive voice:
Fred threw a snowball. (active voice)
A snowball was thrown by Fred. (passive voice)
The active voice is usually favored in writing because it is often more concise and requires fewer words. Consider the following example:
I want freedom. (active voice)
Freedom is wanted by me. (passive voice)
You probably wouldn’t shout “Freedom is wanted by me!” at a rally.
So why would anyone write in the passive voice?
In scientific articles, that is how it’s done.
When reporting scientific results, an author wants to distance the work from the people who performed the work. This is professionalism in the scientific world. The author emphasizes the reactants, products, results, and ideas, not their staff who mixed up reagents, cared for lab mice, created line and bar graphs, and typed up the results.
Consider the following paragraph, which is written in the active voice:
“Jamie centrifuged the suspension at 10,000 x g and aspirated the supernatant. Then she resuspended the pellet in phosphate-buffered saline, pH 7.4. Following this, she spread the suspension on an agar plate and put the plate in a 37°C incubator for 16 hours.”
Doesn’t this sound like I am telling a story or writing a novel? It seems like I am writing about Jamie’s life in the lab, not a scientific paper.
Now consider the same paragraph written in the passive voice:
“The suspension was centrifuged at 10,000 x g and the supernatant was aspirated. The pellet was resuspended in phosphate-buffered saline, pH 7.4 and the suspension was spread on an agar plate and incubated at 37°C for 16 hours.”
We don’t know who did this work…and scientists don’t care if it was Jamie or Jessie or Jenny who did. We do know the actions that were performed, and that’s what we are concerned with. Also, in this case, the paragraph written in the passive voice is more concise, which is important in scientific writing.
If you are a scientific editor, do you prefer the passive or active voice?
