Sound externalization in Headphone

[Junfeng Li <junfeng@xxxxxxxxxxx>]

Dear list, 

Does anyone provide some information (e.g., sound samples) on sound externalization in headphone through binaural rendering/reproduction approach?

As I know, the sound externalization is a big problem for binaural sound reproduction with headphone. While, I have never heard the 'in-the-head' sound and 'out-of-the-head' sound which possibly processed by some signal processing algorithms. 

Could anyone comment on this issue and provide some sound samples to make me know the impression of in/out-the-head sound samples?

Thank you so much in advance.

Best regards,
Junfeng