when the voltage of his happy circuit reaches the threshold, he neglects to pay attention to imminent personal danger, regarding it as someone else's responsibility
noun, countable also happy circuit board a brain neural circuit that makes you think that things will be better, easier, or more successful than is actually possible
"when the voltage of his happy circuit reaches the threshold, he neglects to pay attention to imminent personal danger, regarding it as someone else's responsibility" What is the definition of "happy circuit"?