When you hear people talk about creating new neural pathways, they are talking about potentiation; the increase in strength of nerve impulses along pathways which have been used previously, either short-term or long-term.
In neuroscience, long-term potentiation is a persistent strengthening of synapses based on recent patterns of activity. These are patterns of synaptic activity that produce a long-lasting increase in signal transmission between two neurons. It is one of several phenomena underlying synaptic plasticity, the ability of chemical synapses to change their strength.
From https://en.wikipedia.org/wiki/Long-term_potentiation
The more we use a neural pathway, the stronger it gets. So be intentional about the neural pathways you want to create in your brain, because it has consequences for your future wellbeing and happiness.