visualization
Like I always say, the goal of ear training is to be able to hear something and see it on the neck.
Once you accomplish that, you can then imagine something and see it on the neck.
The final result is to play whatever you imagine...
With that in mind, here are some exercises designed to get you to imagine the fingerboard when you hear intervals.
Diatonic Intervals
These 6 examples are diatonic (in 1 key).
Don't use your bass!
Each example has 9 intervals. What you'll do is imagine the fingering for the intervals you hear.

Imagine a major scale (notes in a key) from your second finger on your left hand.
All the intervals will be from notes in that key (major scale)

There are 9 intervals.
Each successive interval starts with the last note of the previous interval.
for instance C to E, then E to G

The first note you hear and the last note you hear will be the same note (2nd finger)
(if you finish on your second finger, you got all of them right)

Important!
Be sure to use the pause button in between intervals
 
 
 
 
 
 

next:
Chromatic Intervals