FIGURE 39.1 Two personality dimensions Mapmakers can tell us a lot by using two axes (north–south and east–west). Two primary personality factors (extraversion–introversion and stability–instability) are similarly useful as axes for describing personality variation. Varying combinations define other, more specific traits (from Eysenck & Eysenck, 1963). Those who are naturally introverted, such as primatologist Jane Goodall, may be particularly gifted in field studies. Successful politicians, including former U.S. President Bill Clinton, are often natural extraverts.

Jean-Marc Bouju/AP Photo; Andrew Innerarity/Reuters/Landov