Passage Summary: We're finding out that brain chemicals cause everything from serious mental illness to small personality quirks. Because of this, people will likely be nicer and more understanding toward those who act differently, since 'normal' just means having average brain chemistry.

Conclusion: The discovery that neurochemical imbalances cause a wide range of behaviors will lead to greater compassion and tolerance for mental differences.

Reasoning: Mental health is increasingly viewed as simply possessing the same neurochemical balance as the majority, rather than a moral or character trait.

Analysis: To identify the conclusion, look for the claim that the rest of the sentences are trying to prove. The first sentence provides the scientific context, while the second sentence uses the word 'since' to introduce a premise supporting the idea that compassion will increase. Focus on the shift from scientific fact to the social prediction about tolerance. In this case, the psychiatrist is using scientific progress to justify a change in social attitudes. It's a classic 'fact-to-value' transition that often signals the main point in these types of stimuli.