Writing and Reading

{The passage is about Attention Restoration Theory, or ART}
      [1] ART suggests that exposure to nature improves cognitive functioning and overall wellbeing. [2] The theory is based on research that separates attention into two components: involuntary and voluntary attention. [3] Involuntary attention occurs in natural environments where there are inherently intriguing stimuli, while voluntary or directed attention is typically required in urban environments filled with elements that invoke cognitive-control processes. [4] ART proposes that nature appeals to involuntary attention, thereby allowing depleted levels of directed attention to recover. [5] Directed attention is important in cognitive and emotional functioning, but it can become overtaxed.

To make this paragraph most logical, sentence 5 should be placed: