Marketing Metric

Which brain (reptilian or rational) will need to be measured with respect to the use of color and why?

How can marketers measure the reaction to different colors?

What are issues in measuring the acct of colors in marketing  or how people react to them?

 https://video.search.yahoo.com/yhs/search?fr=yhs-sz-001&hsimp=yhs-001&hspart=sz&p=measuring+the+affects+of+colors+on+the+brain+video#id=4&vid=cfd83514922eb12fae371973d3a21b22&action=click 

 https://www.corporateaxtion.com/importance-of-neuromarketing/