Since the beginning of 2013, shares of Tesla, Netflix, and 3D Systems have soared higher as investors began to realize the incredible potential of each of these three very different businesses.

Along the way up, many investors riding the wave proclaimed to be long-term investors and ready to stomach any volatility. However, over the past three months, shares of all three companies are sitting in the red. Is it time to panic or time to buy more of these industry-changing companies?

In the following video, Motley Fool analysts David Hanson, Morgan Housel, and Matt Koppenheffer discuss the psychological impacts on investors and why "timing" the right time to buy these stocks is extremely difficult.

David Hanson has no position in any stocks mentioned. Matt Koppenheffer owns shares of Morgan Housel has no position in any stocks mentioned. The Motley Fool recommends 3D Systems,, Netflix, and Tesla Motors. The Motley Fool owns shares of 3D Systems,, Netflix, and Tesla Motors. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.