Up until now, I’ve been using these almost interchangeably. But I think I understand the underlying difference now, and I’m beginning to understand some of the artifacts thereof.
Psychoticism (Eysenck, Charlton) comes from a relative overabundance of gray matter in the whole brain, vs. white matter. This is why we see it manifest heavily in both negroid personalities, which are exogenous, and thal personalities, which are endogenous. The primary difference between these two examples is that modern thal hybrids tend to have enough white matter to be in the 95th-99th percentile of NW European intelligence (IQ 125-200). White matter acts as a rationalizing heat sink for gray matter impulsiveness, instinct, and intuition.
Associative horizon is concerned with the white matter network, and its activation level. I’ve previously mentioned the reticular activating system as a possible candidate for determining activation level, but the important thing to understand is that each brain will have a general factor of activation potentials. This general factor is what I will hereafter refer to as associative horizon.
Since I finally picked up that Kahneman book, I suppose it makes sense to mention that psychoticism is concerned with System 1 subconscious cognition (perceptual, instinctive, intuitive) and associative horizon is concerned with System 2 conscious reasoning (step-by-step, rational, discrete).