The Hidden Side of Your Brain: Fast Type 1 Thinking

February 2012

in Self-awareness

There is a large, hidden side to our brains. Understanding how it works and what it does is key to improving our thinking and deciding.

We have this amazing ability to think without thinking. Not literally think without thinking, but thinking without thinking that we’re thinking.

Let’s try that again. We are often thinking, but because we can’t feel or notice this thinking, we’re not aware of it.

While walking down a street and chatting with a friend, you’re not thinking, “Right foot, left foot, right foot – stay balanced! – left foot, right foot…” Yet you walk without difficulty, taking thousands and thousands of steps without fault, and you’re keeping a conversation, and you’re aware that your friend is in a good mood, and you notice a car approaching from the corner of your eye. All of this is the furthest thing from an effortful task. How much could your brain really be doing if you don’t feel anything happening in there? 

A Few Examples

Take a look at the following:

What is 2 + 2?

Assuming you didn’t have any difficulties with that, let me ask: Why not? Why was it so easy?

Now take a look at the picture on the right.1

When glancing at this picture there is a flurry of activity in your brain. You had a bunch of automatic thoughts and reactions. For starters, you instantly recognized that this woman’s hair is dark, and that she is angry. She is probably about to say something unpleasant, and probably in a loud voice. This thought process was fast and intuitive.

Here’s one more example. Take a look at the following sentence but do not think about the meaning behind it.

The sky is green.

Several things just happened almost instantly in your brain. First, you were able to recognize, process, and understand all of the words in the sentence, whether you wanted to or not. You couldn’t not understand the words in the sentence, even if you tried! Second, you understood that I was attributing a colour to the sky. Third, you recognized that green is an odd colour to claim about the sky.

In all of these cases, your reaction is fast. You don’t consciously reason, “Hmm, this is rather unpleasant, I would like to look away now.” It just happened, and shortly afterward you realized you had turned your head.

What are the similarities?

There are some key similarities in the above situations and examples. In every case, your thinking is:

  1. Autonomous – This is the most defining characteristic; everything happens “behind the scenes”, as though it has a mind of its own, separate from your consciousness. You see it as much as you see the back of your head, and it doesn’t matter how hard you try. It just happens, whether you want it to or not; it is beyond your control. It is as automatic and unstoppable as your beating heart.
  2. Fast – The answer or reaction comes to mind in a fraction of a second. This is the sports car of thinking.
  3. Effortless – You don’t have to think hard to make it happen, it just happens, all on its own; you didn’t have to concentrate or focus. In terms of effort, it is like taking a casual stroll.
  4. Simultaneous – You can process many things at once, in parallel. As you walk while holding a conversation you’re not just automatically placing one foot in front of the other; you’re also processing language, emotions, balance, and distance, all at the same time. You’re like a juggler with ten balls simultaneously in the air.

In fact, the type of thinking that shares these features has been grouped in the scientific literature into a single category.

What is this kind of thinking called?

This type of thinking – autonomous, fast, effortless, simultaneous – has many different common folk terms, such as “intuition”, “instinctive” thought, or subconscious thinking.

Scientists tend to avoid these vague words so they can be more precise. However, for a long time there was no single consistent or common word for this sort of thinking. Various words have been used, such as tacit thought processes, modular processes, reflexive system, associative processing/system and automatic processing. The term heuristic is one of the oldest and most popular.2

Keith Stanovich (1999) suggested the generic System 1 as a general term for all the types of thinking presented in the above examples – particularly that which is autonomous, but also fast, low-effort, and parallel. This is intentionally nondescript, so that it won’t needlessly confuse the thinker or associate this thinking with a single word like “automatic”. This has become a popular term used in psychology today.

However, several people, including Stanovich, have since discussed why this name isn’t ideal. It’s not because of how ‘nondescript’ it is, but rather because “System 1” sounds like you’re referring to a specific, single system in the brain, but this isn’t so.3

The type of thinking you used in the examples from this post aren’t from a single system in the brain, they are from a collection of systems. Calling it “System 1” can cause accidental confusion. For this reason, Type 1 processing/thinking is a better word.4 This emphasizes that we’re talking about various parts of the brain that all perform a similar form or type of thinking – specifically, thinking that is autonomous (automatic and hidden), fast, effortless, and simultaneous.

What else is there?

You may be wondering: What other types of thinking is there? What about my conscious awareness?

Take a look at the following:

24 x 37

You know, instantly, that it is a multiplication problem, and that the answer is definitely more than 10 and definitely less that 1,000,000. That’s your Type 1 (automatic) thinking at work.

Now spend a minute and try solve the problem, by hand.

This is an example of the other type of thinking: Type 2 processing. Notice how completely different your experience was compared to all of the other examples in this post! It was not autonomous. It was slow and deliberate, it took time, you had to concentrate, you were conscious of all that was happening, and effort was required.

I won’t get into Type 2 thinking here, that’s for the next post. For now, recognize that there clearly is a different type of thinking than the autonomous Type 1, and recognize just how different performing the multiplication problem was from all the other examples.

In short…

Much of your thought happens beyond your awareness. Type 1 processing is totally automatic. If I say “elephant” it is impossible for you to not think of an elephant. In general, Type 1 thinking is:

  • Automatic like your beating heart.
  • Hidden like the back of your head.
  • Fast like a sports car.
  • Effortless like a casual stroll.
  • Simultaneous like a juggler.

We may recognize what our Type 1 thinking did after the fact, but not while it’s happening. It’s too fast! Your conscious awareness (Type 2 processing) needs time to process and recognize it, but by then you have already made a disgusted face, caught your balance, or noticed your mother is angry.

Remember how completely unaware you are of your Type 1 thinking as it happens.

This will play an important role in much to come. Type 1 and Type 2 processing interact in interesting and illuminating ways. Recognizing the key characteristics of our Type 1 thinking will help us understand both how our minds work and how to improve our thinking and deciding.



Evans (1984). Heuristic and analytic processes in reasoning. British Journal of Psychology, 75, 451-468.

Evans (1989). Bias in human reasoning: Causes and consequences. Hove, UK: Lawrence Erlbaum Associates.

Evans (2006). The heuristic-analytic theory of reasoning: Extension and evaluation. Psychonomic Bulletin and Review, 13, 378-395.

Evans (2008). Dual-process accounts of reasoning, judgement and social cognition. Annual Review of Psychology, 59, 255-278.

Evans (2009). How many dual-process theories do we need? One, two, or many? In J. Evans & Frankish (Eds.), In Two Minds: Dual process and beyond (pp. 33-54). Oxford: Oxford University Press.

Kahneman (2011). Thinking, Fast and Slow. Canada: Doubleday Canada.

Stanovich (1999). Who is rational? Studies of individual differences in reasoning. Mahwah, NJ: Erlbaum.

Stanovich (2004). The robot’s rebellion: Finding meaning in the age of Darwin. Chicago: University of Chicago Press.

Stanovich (2011). Rationality and the Reflective Mind. New York, NY: Oxford University Press.

Car image by Damian Morys Foto
Heart image by yaba.
Walking image by o5com.
Juggling balls by Callum McKain

  1. Image and description adapted from Kahneman (2011), Chapter 1. Image is originally from Paul Ekman Group, LLC. []
  2. See Stanovich (2011), Table 1.1 for a thorough list; see Evans (1984, 1989) for a discussion of the term heuristic. []
  3. Stanovich (2004), Evans (2006). []
  4. Evans (2008, 2009). []