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Do you believe everything you read!?

How Gullible are We?

Are you naturally gullible? Do you believe what the TV, the newspapers, and even blogs tell you?  Or are you naturally critical? All our minds seem to have the same first reaction to new information. What is it?


René Descartes believed that understanding and believing are separate processes. He argued that first people pay attention and take in some information, then they decide if they believe or disbelieve it. Descartes' view seems to be correct, or at least it seems to be the way we would like it to work.

Spinoza's Psychology

SpinozaBaruch Spinoza believed something quite different. He claimed that we believe all new information. He thought we could change our minds, but because it takes more effort to investigate and critique information we just believe it until it is pointed out to be untrue..
Spinoza's view is unattractive  because it suggests we have to spend our energy looking for falsehoods, whether by word of mouth, TV, the internet or any other medium .


Daniel Gilbert and his colleagues tested these two theories in a series of experiments to determine how we treat new information (Gilbert et al., 1993). In their  experiment participants read statements about two robberies then sentenced the robbers to prison. Some  statements made the crime seem worse, e.g. the robber had a gun, or to lighten it, the robber had to feed his starving children. But, only some of the statements were true. They were told that all the true statements were in green type, while the false ones in red. During the experiment half the participants were distracted while reading the false statements and the other half were not.

If Spinoza was correct then those who were distracted while reading the false statements wouldn't have time to discern that the statements were written in red and not true, and thus would be influenced by it when giving the jail term to the criminal. If Descartes was right the distraction would make no difference because they wouldn't have time to believe or not believe and it wouldn't make any difference to their sentencing.

What have we discovered ?

When the false statements made the crime seem worse, the interrupted participants gave the criminals almost twice as long in jail, 11 years instead of 6. The uninterrupted group managed to ignore the false statements. Consequently their jail terms had no significant differences on whether false statements made the crime seem worse or less serious.

Therefore, only when people had time to think could they behave as though the false statements were actually false. On the contrary, without sufficient time, people simply believed what they read. Gilbert and colleagues concluded that Spinoza was right. Believing is not a two-stage process. Understanding is believing; you believe the new information until you use your critical faculties to change your mind. Thus it is easier to believe than to not believe.

First You Believe

Gilbert's study also in part explains some other common behaviours of people:

  • Attribution bias: people's assumption that a person's behaviour reflects their personality, when in fact it only reflects the situation.
  • Truthfulness bias: people generally assume that others are telling the truth, even if and when they are lying.
  • The persuasion effect: distraction increases the persuasiveness of a message.
  • Hypothesis testing bias: when testing a theory, people tend to look for information that confirms it rather than trying to prove it wrong.  

Spinoza's claim that understanding is believing could explain some of the these biases  as a result of our tendency to believe first and not ask questions until later. Take the attribution bias: when you meet someone who seems nervous you probably assume they are a nervous personality. It seems an obvious inference to make. It may not  occur until much later that they were nervous because they were waiting for important test results.

Gilbert agreed that this seems like bad news. If people believe everything they see and hear, we may have to control what they see and hear.

The Benefits of the Spinoza Bias

Too much cynicism is not a good thing. You would then only believe things for which you had hard evidence. Everything else would be in a state of limbo until investigated. If we had to go around checking all of our beliefs all the time, we'd never get anything done and perhaps miss out on a lot of great opportunities.

If you follow Spinoza's model, you can believe new information as a general heuristic, then investigate the suspect information later. Yes, you will often believe things that aren't true, but it's better to believe too much and be tricked once in a while, than to be too cynical and miss out on so much that is actually true.

Perhaps I am being gullible. Perhaps we are all too gullible and too lazy to use our critical minds. What do you think?

The Black Boxes of our minds

Even to Ourselves

The stories we tell about our mental processes are logically appealing but fatally flawed more often than not.

We all have our own theories about how our minds work. Unfortunately evidence based psychology demonstrates that our theories are often wrong. The differences between how we think our minds work and how they actually work can be quite startling, especially when we try to judge others. What we think are important factors in others often are not at all, while what we think is unimportant can make all the difference.The black box of our mind

Social Psychology Study

In their classic study Nisbett and Bellows (1977) asked 128 women to judge if a person called Jill matched the requirements to work in a crisis centre. 'Jill', was a creation of the investigators, consisting of 3 pages of information: an interview transcript, answers to a questionnaire and a letter of recommendation.

The information presented to the women about Jill was the same except for 5 crucial factors which changed amongst the participants. The women were told that:

  • Jill has an attractive appearance or nothing about her looks
  • Jill's academic qualifcations are good or nothing about her studies
  • Jill had had a car accident before or not
  • Jill spilled coffee on the interviewer's desk or not
  • Jill would meet the women subjects soon or not

This meant that each woman saw a different combination of items in Jill's profile.They were then asked to judge Jill on how much:

  • sympathy she would have for others,
  • the women would like her,
  • flexibility she would have in problem solving,
  • intelligence she had.

The women were then asked to rate how much each of the above factors influenced  their rating on a scale of 1 to 7. The experimenters wanted to see whether the womens' judgements were controlled by factors they thought influenced them. In other words, do people know how their own minds work?

Poor judgement

The women turned out to be surprisingly poor at predicting the ratings of sympathy, likeability and flexibility and the effect of each on their own judgements. For example the women thought if Jill was good-looking she would be more sympathetic to others. But, it had the opposite effect; if Jill was described as good-looking the women thought others would find her less sympathetic.

They thought that the car accident would make Jill more likeable, but it made her less likeable. They thought the coffee-spilling would make her seem less flexible in problem solving; but those same women rated Jill as more flexible. And so on.

The interesting thing

All the women were wrong to the same degree. All the women probably used similar 'common sense' theories about how the mind works, which were mostly wrong. The results suggest that most of us have similar 'theories' about the way the mind works, from our culture or we worked it out from 'common sense'. The only area in which the women were accurate was intelligence. The women thought they could rely on the academic records to judge Jill's intelligence and, they could.

The weakness of introspection

This study shows how poor we are at understanding what will affect our judgement of another's personality, besides intelligence. People might know what they like, but they usually don't know why they like it. Similar results are repeated in other studies showing our lack of understanding of who we're attracted to, how we solve problems and where our ideas come from.

These results are a real challenge to psychologists like myself. The most important decisions in our lives, like choosing how we spend our time and with whom we spend it, are challenged. The stories we believe about ourselves are appealing, but are wrong more often than not.