A lone twin is someone who was conceived as a twin (or a multiple) but who was born alone. Due to advances (over the last thirty years) in medical science it has been discovered that up to 1 in 8 people are conceived as twins. Since only 1 in 30 are born as twins this means that a significant portion of the population (approx. 8-10%) are lone twins.
Here is a list of some of the psychological signs associated with being a lone twin:
There are many consequences to being a lone twin, some negative, some positive, but most of the negative ones arise from not knowing that you are a twin. The main advantage of knowing is that it explains many feelings and experiences that are inexplicable to others and that seem 'crazy'.I am hypersensitive, both physically and psychologically
I am highly intuitive and very empathetic
I think a lot about death and dying
I am a very emotional person
I am always very busy
I love two-ness
I have a strong, imaginary inner life
I have some kind of problem with food and eating
I feel different from other people
I have been told I have a “personality disorder”
I have been diagnosed with schizophrenia or autism
I find it hard to let go
I know I am not fulfilling my potential
I know that my deepest needs are not being met
I know I avoid getting close to other people
I feel as if I am a “suffering survivor”
The best website that I know of for information about the subject is Womb Twin.
A very good book on the whole subject is: The Twinless-Self by Jim Cogley. (It's a bit expensive, so I wouldn't recommend buying it, but if you saw it second-hand for a good price it would be worth checking out.)
Knowing that I am a lone twin has helped illuminate otherwise confusing and inexplicable experiences for me; my hope is that by bringing this phenomenon to more general attention others may benefit in a similar way.
ussusimiel.
[EDITS: to remove broken links and add a new one.]