Knowledge of the External World

Knowledge of the External World

1. Naive/Direct Realism

   • Def: Tree in Forest
   • CRIT
     • Perceptual Error
     • Lag in Time
     • Hallucinations
       • RES: Testimony of Others
         • CRIT: Matrix
     • Circular Justification

2. Qualities

   • Primary (Measurable)
     • Essential
     • Colorless Apple
   • Secondary (Subjective)
     • Non-Essential
     • Batchelor's Hair

3. Representative Realism

   • Agrees with D.R.
   • Primary Q are Real
   • Secondary Q are Illusions
   • Sense Data
   • Useful
     • Mapping Contours
     • Molecules
   • CRIT: Veil of Perception
     • (no real access to World)
     • RES: Survival Uses
       • Evil Daemon

4. Idealism

   • Dependance on the Mind
   • Berkeley (Sense Impressions as Ideas
     • Blind Colours example
     • Existence in Perception
   • CRIT: Continued Existene e.g. Apple
   • CRIT: Regularity of the Universe
     • RES: God (planting of ideas)
       • CRIT: Weak Defence
         • RES: Equal to D.R.