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Attention > Sustained Attention

Private Eye

Screenshot of HappyNeuron Pro exercise Private Eye

Please note that you can only play the exercise once on this page. See the free trial section below for full access!

Attention > Sustained Attention

Private Eye

In this exercise, the user must locate a symbol in a grid full of intricate symbols and letters.

Brain Areas Engaged 

Learn more about this exercise:

The brain receives lots of sensory information and must choose what to focus on and what to ignore. Many neurological disorders—including schizophrenia, autism, and attention deficit hyperactivity disorder—involve problems concentrating and ignoring distractions. Scientists have long believed that a brain region called the prefrontal cortex (PFC) selects what information to focus on. The neocortex, the outermost layer of the brain, is found only in mammals and is responsible for humans’ ability to recognize patterns.

Primarily, this task exercises the user’s sustained attention and concentration skills. Individuals may use these same skills when proofreading a text message or email. They may also use these same skills when they are trying to see what is in stock and what they may need to order.

You can modify:

  • The type of help (with help, with an intruder, multi-symbols, or odd one out, or not)
  • The size of the grid (2×2, 4×4, 4×6, 4×8, 6×8, 8×8, 8×10, 8×12, 8×14, or 8×16)
  • The number of sequenced series (2, 4, 5, or 10)
  • The type of characters (letters and numbers or symbols)
  • The response time (unlimited, 120, 60, 30, 20, or 10 seconds)

Over 1,900 unique exercise configurations and significant data set depth.

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Other sustained attention exercises:

Find Your Way!

Sustained attention, planning

Ancient Writing

Attention, working memory

Displaced Images

Attention, working memory

Try printable versions of this exercise



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