Radcliffe is seeing a psychologist for a new film role
The `Harry Potter` star is taking research for his new movie horror thriller `The Woman In Black` so seriously he is seeing a specialist with expertise in grief and loss to prepare as best he can, drawing on the loss of his own grandmother Elsie.
A source said: "The preparation has been difficult.
"Daniel is filming a mature, complex role and wants to understand his character`s emotion."
Daniel plays young lawyer Arthur Kipps in the movie, a young man who must visit the estate of a deceased client, later discovering he is not alone in the property.
The movie - based on the book by Susan Hill - is being adapted by `Kick-Ass` screenwriter Jane Goldman and `My Little Eye` scripter James Watkins.
Daniel, 21, previously admitted he was "excited" by the movie, his first since completing work on the `Harry Potter` series.
He said: "I am incredibly excited to be part of `The Woman In Black`. Jane Goldman`s script is beautifully written - both tender and terrifying in equal measure.
"It is thrilling to be working with James Watkins. From his brilliant work on `Eden Lake` and also having met him and heard his vision for the film, I know he will make a fantastic film."
The movie - which is being shot in 3-D - is due for release in 2011.