The brain’s building blocks are neurons: nerve cells that receive and transmit signals along neural pathways. Certain pathways are forged at birth. Others can be manipulated by learning. 

So when you’re stuck in a rut, your brain’s neurons could literally be stuck on a neural pathway you’ve carved out through your behavior. But you can get unstuck by choosing to make new connections.

Your brain is continually striving for predictability, and it can get pretty set in its ways. When a novelty appears, the dorsolateral prefrontal cortex (DLPFC) part of your brain is wired to review old rules and apply them to this new situation. It does not want to invent new ways if it can help it. This can hinder your creativity.

Combinatory play can help with quieting this part of the brain by relaxing your mind.

While applying old lessons to new situations can limit your creativity, the brain’s inclination for seeking patterns can encourage innovation, too.

Try a new activity within your field or related to it; you’ll expand your neural connections and strengthen your brain overall.

If you’re a novelist, try your hand at poetry. If you’re a painter, dabble in sculpting. If you’re a computer scientist, play around with web design.

Doing something boring, like showering, doesn’t require substantial cognitive effort, so our brains are free to wander. 

And a brain “at rest” isn’t really resting at all. Mind-wandering may allow the conscious to give way to the subconscious, so the brain can connect disparate ideas.

If you’re feeling stuck on a problem, try going to bed. You just might have a more creative solution in the morning.

When we’re in REM, our brains are better able to integrate unassociated information, which is essential to creative thinking (and can explain why dreams are so bizarre).

Get inspired by someone else’s creations:

• If you’re suffering from writer’s block, buy a pack of word magnets and rearrange them until you come up with creative phrases on your fridge.
• If you’re building a product and you're stuck in the design phase, search for competitors who have made similar products, find where their customers are unhappy, and design something new that solves the problems your competitors failed to address.

... use combinatory play to give your brain a boost:

• Participate in creative cross-training to expand your brain’s neural connections.
• Let your mind wander by doing something mundane, like taking a shower.
• Go to bed and let your subconscious mind connect the dots during REM sleep.
• Use another person’s work as a springboard for inspiration and improvement.