Unity3D / Google Cardboard Android app for viewing a model of the human brain
Available for free on Google Play
More info on the data at thyrd.info/brainvr
Brain VR uses the Takohi Games Text to Speech plugin, which is $2 from the Unity store:
https://www.assetstore.unity3d.com/en/#!/content/21772
Installing that package will create:
Assets/Plugins/Android/ttsunityplugin.jar
Assets/Plugins/UnityAndroidTTSPlugin.dll
Assets/Takohi/*
which should allow you to build Brain VR.