Interdisciplinary Center for Neural Computation, Hebrew University, Jerusalem, Israel. kalon@post.tau.ac.il|Interdisciplinary Center for Neural Computation, Hebrew University, Jerusalem, Israel. kalon@post.tau.ac.il|Interdisciplinary Center for Neural Computation, Hebrew University, Jerusalem, Israel. kalon@post.tau.ac.il|Interdisciplinary Center for Neural Computation, Hebrew University, Jerusalem, Israel. kalon@post.tau.ac.il|Interdisciplinary Center for Neural Computation, Hebrew University, Jerusalem, Israel. kalon@post.tau.ac.il