The mind-body problem how many ossible solutions? 3. Idealism Berkeley 4. Panpsychism(Leibniz, Hegel) 5. Neutral monism Ernst Mach)The Mind-body problem: how many possible solutions? • 3. Idealism (Berkeley) • 4. Panpsychism (Leibniz, Hegel) • 5. Neutral monism (Ernst Mach)