It seems you are right. From export_descr_character_traits.txt
Code:
Trait PhilosophySkill
Characters family
ExcludeCultures barbarian
NoGoingBackLevel 4
AntiTraits Ignorance
Level Philosophically_Inclined
Description Philosophically_Inclined_desc
EffectsDescription Philosophically_Inclined_effects_desc
Threshold 2
Effect Management 1
Effect BribeResistance 2
Level Philosopher
Description Philosopher_desc
EffectsDescription Philosopher_effects_desc
Threshold 4
Effect Management 2
Effect BribeResistance 5
Level Abstruse_Philosopher
Description Abstruse_Philosopher_desc
EffectsDescription Abstruse_Philosopher_effects_desc
Threshold 8
Effect Management 3
Effect BribeResistance 10
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