These unconscious actions and reactions to them may in part account for our 'feelings' and 'snap judgments.' (Para. 4)
Meaning: These unconscious actions of sending and receiving and reactions to them may partially explain the cause of our 'feelings' and `snap judgments'.
account for: explain and give information about
Can you account for your being absent last Friday? 你能说明上周五缺席的原因吗？
She was unable to account for over $1,000. 她无法解释1,000多美元的用途。