The negativity bias is so dominant for a very good reason. In fact, mankind has relied on this trait to keep us safe for thousands of years and it has allowed us to emerge as the dominant species.
The bias is likely the result of thousands of years of evolution, where paying greater attention to negative (and thus potentially dangerous) threats was literally a matter of life and death. Those who were more instinctively attuned to imminent danger were more likely to avoid it.
It is far less consequential to overestimate a threat than to underestimate it (overestimate it and you may miss out on a meal. Underestimate it and you may end up being the meal!). It is survival of the fittest at its finest.
Although just a theory, science has evidence to support it. Neuroscientific experiments, where the brain’s response to negative stimuli was measured through event-related brain potentials (ERPs), showed that the brain’s response to specific negative stimuli elicited a larger neural response than that derived from positive stimuli.
This indicates that the brain is hardwired to be stimulated by negative emotions to a greater degree than positive ones. To fight this would be to fight every natural instinct inherent in us.
In a similar study conducted by psychologist John Cacioppo, participants were shown pictures of either positive, negative, or neutral images.
The researchers then observed electrical activity in the brain in a similar manner. Negative images elicited a much stronger response in the cerebral cortex than did positive or neutral ones, further inferring the brain’s tendency to react more readily to negative information.
Further anecdotal experiments have also revealed this biological law. A hypothetical medical procedure was presented in two opposing manners to willing participants.
The first identified the medical procedure as having a 70 percent chance of success, of which the majority concluded that it was a good procedure, whilst the second group had the procedure presented to them as a 30 percent chance of failure, of which the majority identified as risky. The exact same experiment presented from two different opposing manners significantly changed the participants’ view of it.
The second part of this experiment was even more interesting. When the group who were previously happy with the 70 percent chance of success were then explicitly told of the 30 percent chance of failure, the majority changed their view of the procedure and thought it risky (as the group who originally viewed it as negative did).
Conversely, when the group who were originally told of the 30 percent chance of failure were then told it was a 70 percent chance of success, they did not change their minds. The negative viewpoint had already stuck with this group and a positive redirection was not enough to change it.
The key finding here is that it is easy to switch from a positive to a negative mindset and more difficult and slower to shift away from a negative one. Although simply anecdotal, these findings reinforce that which has been found through neuroscientific research. The brain is hardwired to fixate more on the negative, and it is more difficult to switch a viewpoint from positive to negative than it is the other way.
The swings and moods of the economy is also a telltale sign of this bias in action. When the economy suffered from the great depression, public confidence in the economy dropped exactly in line with it.
Yet when the economy started to recover, public confidence also increased alongside its rise as it did with the drop, but there was a significant and noticeable lag, indicating a prolonged feeling of negativity among the public despite the economy’s improvement.