JEANNE's VISIONS

1)  1424 - She heard the voice for the first time on her right in the direction of the Church of St. Remy and every time the voice was accompanied by a light that came from the same side as the voice

2)  The visions she saw felt as real as seeing another person and were always accompanied by a light and St. Michael with other angels. 

3)  These visions and voices made her religiously inclined, and she spent a lot of time confessing in the Church about the same and she did not tell anyone about this until 1428 when the voices asked her to seek an audience with the Dauphin

4) First of the visions was St. Michael that she saw before her eyes accompanied by many angels from heaven. St. Michael told her that Saint Catherine and Saint Margaret would come to her to instruct her

6) These mystical visions started when she was 12 years old

7)  Joan's visions may have been the result of epileptic fits.  Petit mal seizures  control the arousal and attentional status of the brain, and during which, behaviour is beyond control. Stored behavioural programmes are being "read out" and favours the victim's assumption that an invisible entity has "taken over." Visual and auditory hallucinations interweave with the surroundings as Hearing voices and seeing visions.

Sources

http://www.biographyonline.net/women/joan-of-arc.html 

http://www.joan-of-arc.org/joanofarc_life_summary_visions.html

http://ed5015.tripod.com/PaJoanArc87.htm