The following post is about AU1 – inner brow raiser, driven by the medial part of the frontalis muscle. It covers: anatomisk variation, gemensam misstag, och ger ren referenser. 

 

Vad är jagnner Brow Raiser?

Inre ögonbrynen höjs, eller AU1, är en System för kodning av ansiktshandlingar (FACS) action unit (AU). Its function is to raise the medial brow/forehead area, and its action is triggered by the contraction of the medial region of frontalis. It can difficult find clean references inre ögonbrynshöjare. When building FACS references, many sources fail to:

1. Find actors who can voluntarily trigger their medial frontalis without also contracting the lateral area of frontalis or corrugator supercilii. 
2. Rikta modeller på rätt sätt to perform medial frontalis contraction.

In our everyday lives, most of us can effortlessly raise our inner brows without thinking twice; however, when commanded to, many people struggle to isolate this motion.

FACS referenser och felaktig information

I recently (2020) critiqued a set of FACS shapes for a client and noticed his inre ögonbrynen höjs form hade en del wellpapp (från ögonbrynssänkare) som av misstag blandats in.

Client’s Inner Brow Blendshape + My Notes:

Lägg till en wellpappemaskin till inre ögonbrynen höjs är ett mycket vanligt misstag. Detta beror delvis på att: Bra referenser är svåra att hitta!

Even my client – an established industry artist with a great portfolio and CV – unknowingly added corrugator features to his model, because he trusted a tainted reference. The reference he used was from a prominent anatomy and facial expression book: Anatomi av ansiktsuttryck. Many art students and professionals use this textbook. It is a great textbook, but some of its FACS shapes are inaccurate.

Reference used by client:

See the vertical and wavy lines in the center of the forehead in the images below? Those vertical lines are from a brow knitting muscle known corrugator supercilii.

To view some clean examples of medial brow raising, observe the GIFs below. Read about the primary and secondary effects of inre ögonbrynen höjs och hur dess egenskaper kan variera mellan olika individer.

Clean AU1 - Exempel på inre ögonbrynshöjare

example i

example ii 

For more information se: Det hemliga livet för den inre ögonbrynsresenären.

For a full and structured FACS deep dive, see my online course, the: FACS Cram Session.