Automated fMRI Feature Abstraction using Neural Network Clustering Techniques

An adjustable head mounted display apparatus includes an outer casing, an image display unit disposed in the outer casing for generating an image, and a reflection unit adjustably disposed to each side of the image display unit with a predetermined distance therebetween so as to reflect the image generated from the image display unit. The apparatus also includes a lens unit, which is disposed in front of the reflection unit to be adjustable with regard to a distance from the reflection unit, for magnifying the image reflected from the reflection unit, and an optical distance adjust means for adjusting a distance between the image display unit and the reflection unit and between the image display unit and the lens unit. The apparatus allows the optical distance adjust member to maintain a constant optical distance between the image display unit and the reflection unit and between the image display unit and the lens unit, or a focal point of the lens so as to provide a stable screen image and preventing eye fatigue.