Introduction

1. Penrose theory

2. Penrose-Hameroff theory of consciousness

3. Diosi-Penrose theory

4. Empirical test of Diosi-Penrose theory

Comparison with TGD based approach

1. TGD inspired quantum gravitational view about metabolism and nerve pulse conduction

2. The P-H theory and TGD

3. Could the space-time surfaces in the superposition correspond to different scalings?

4. Could the TGD analog of Orch-OR make possible an action potential for protocells?

5. How water blobs could have evolved into living organisms?

6. Could quantum criticality make microtubules very special?

Appendix: Quantum gravitational decoherence as a way to test the Diosi-Penrose model

1. Brief summary and criticism of Penrose-Diosi model

2. Could one measure the rate of gravitational quantum decoherence in the Penrose-Diosi model?

3. The approach of Donadi et al

4. Comparison with the TGD view

5. Could one measure the rate of gravitational quantum decoherence in the Penrose-Dionisi model?

6. The approach of Donadi et al

7. Comparison with TGD view