Wallin's discourse encompasses: 

1. The musical consequences of cerebral functional asymmetry; 
2. The hierarchic and selective organization of perceptual-cognitive auditory processes; 
3. Reticular-limbic responses to musical stimuli interpreted as synapse-modifying mechanisms for long-term motivation and learning, as well as for phylogenetical "learning"; 
4. The question of remnants or retentions with roots in the sound-gestures of other vertebrates of a higher order (and not solely the non-human primates) being active in the innermost structure of music; 
5. Vocalization techniques, e.g., the "kolning" technique of the late Paleolithic herding culture of Europe, as paleobiological retention; 
6. The epistemological perspective of models of life-processes as discussed in recent scientific research.