THE TWIN EFFECT

BIRTH ORDER

• First born: Reliable, conscientious, structured, cautious, controlling, achievers
• Middle child: people-pleaser, social, peacemaker, easygoing
• Last born: outgoing, self-centered, manipulative, fun-loving

"Families within Families"
"Since twins are perceived as a single unit, they separate themselves from the traditional family and revel in their special opinion." (Leman)

DEFINING YOURSELF
"Defining my identity and working on individuation has taken a lot of energy"- Liz Keliher
"Being a twin has made it harder for me to have my own clear sense of self"
- Derek Beckwith

RELATIONSHIPS
"Being a twin is having a bond that lasts forever"
- Dhyanna Noble
"I have more of a sense of home"
- Anne Keliher

SPONTANEOUS OTOACOUSTIC EMISSIONS: continuous, essentially tonal sounds produced by normal cochleas

Generally, females exhibit more of these than men. However, females with a male co-twin exhibited half the average number of SOAEs than in female non-twins and same-sex female twins. (McFadden)

mental rotation tasks

Usually men score higher on mental rotation tasks. However, a study was done (by Vuoksimaa) showing that females with a male co-twin had high scores than females with a female co-twin.

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