Lívia Simão referred to the similarities between her constructivist-semiotic-cultural psychological approach and Engelmann's two consciousness proposal. Nelson Coelho Jr. comments the similarities between Husserl and Merleau-Ponty approach and Engelmann's studies of consciousness. Nevertheless, despite the origin of the knowledge in himself, Coelho Jr. accept the reality of other people and the reality of the world. Arno Engelmann answered the arguments of the two commentators. In answering to Coelho Jr., he declared that he is faithful to a skeptic thesis. The reality of other people and of the world is an hypothesis, although a very high probability hypothesis.
constructivism; phenomenology; consciousness