Halliday & Matthiessen (1999: 599):
In a way … material reinterpretation [psychology] and ‘unconsciousness’ [psychoanalysis] are opposites: the first reconstrues sensing in terms that are more readily observable by scientific method (ie method other than introspection), while the other introduces a factor that is even less readily observable than conscious sensing: unconscious motivation. But they share the characteristic that they construct the ‘mind’ as remote from our everyday experience with sensing.