What is the simplified art style called that is often used when a character is emotional? If there's even a name for it?

I saw this question that explains why but I'd love to know if there's a name for it. The linked question mentions superdeformed but I figured there's a Japanese name, if there's anything.

They do it in many anime (and manga) and it's used with the character is embarrassed, sometimes it's when they're tired, annoyed, or confused.

It reminds me of chibi but it's even simpler than that and doesn't really make them look like kid-versions.

From Fullmetal Alchemist: Brotherhood:
The so-called "simple background" is essentially a montage of a particular mental landscape. Sometimes referred to as "kouka haike" (効果背景, lit. effect background) or "kouka back" (効果バック, lit. effect back), referring to a simple effect background.

The particular lines in the scene are likely some variant of "taresen" (たれ線) meaning "dripping lines". Sometimes it is also generically referred to as "tatesen" (縦線), or "vertical lines". 

They both refer to the depiction of parallel vertical lines (sometimes squiggly or uneven to represent a distressed state) in a background or on a particular character's face. The lines typically of a dark blue or purple hue (they can vary by artist and context) is indexed to express how a particular character or scene feels depressed, sad, disgusted, or anguished, amongst other negative feelings.

The term is likely derived from 垂れる, referring to how the emotions of the scene or character are "dripping".