The actress - who played Vivien Harmon in the FX drama's first season - told Vulture that she has only seen a few episodes.
"I couldn't watch a lot of American Horror Story - I'm not proud of [being scared]," she admitted. "I just had to pick an episode to submit for the Emmys. I was scrambling.
"I texted [executive producers Ryan Murphy and Brad Falchuk] and said, 'I'm really sorry, guys, I haven't really seen this show, so can you give me some guidance?' They helped me choose."
Britton revealed that she ultimately chose the season's eighth instalment, 'Rubber Man', as her Emmy selection.
"That's when I watched it," she explained. "It was scary! I said to Brad, 'I just watched Rubber Man - our show was really good!'"
The second season of American Horror Story - airing on FX in the UK this autumn - will feature new characters in a new setting, with Jessica Lange playing the head of a criminal asylum.
> American Horror Story casts Bourne Identity's Franka Potente
> American Horror Story casts Carnivàle's Clea Duvall for season two
Watch a trailer for season one of American Horror Story below: