“The key here is really that last point in the highlights— ‘Sustained attention for negative stimuli may be an important target for depression interventions’,” Dainer-Best explained to PsyPost.
I couldn't understand the underlined part at all!!
"The key here is really X" means that X is the essential thing that is needed in order to explain or understand or achieve something. e. important points.
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"The key here is really X" means that X is the essential thing that is needed in order to explain or understand or achieve something.
"that last point in the highlights" means the final item in a list of highlights, i.e. important points. (The content of this final item is then quoted: "Sustained attention for negative stimuli ... blah blah".)