this is something much more complex than i thought it was. there are many theories about this, heres a chart with some.
http://www.personalityresearch.org/b.../plutchik.html
<TABLE BORDER=1 CELLSPACING=2><TR><TD><P><B>Basic Emotions</B></TD><TD><P><B>Basis for Inclusion</B></TD></TR><TR><TD><P>Acceptance, anger, anticipation, disgust, joy, fear, sadness, surprise</TD><TD><P>Relation to adaptive biological processes</TD></TR><TR><TD><P>Anger, aversion, courage, dejection, desire, despair, fear, hate, hope, love, sadness</TD><TD><P>Relation to action tendencies</TD></TR><TR><TD><P>Anger, disgust, fear, joy, sadness, surprise</TD><TD><P>Universal facial expressions</TD></TR><TR><TD><P>Desire, happiness, interest, surprise, wonder, sorrow</TD><TD><P>Forms of action readiness</TD></TR><TR><TD><P>Rage and terror, anxiety, joy</TD><TD><P>Hardwired</TD></TR><TR><TD><P>Anger, contempt, disgust, distress, fear, guilt, interest, joy, shame, surprise</TD><TD><P>Hardwired</TD></TR><TR><TD><P>Fear, grief, love, rage</TD><TD><P>Bodily involvement</TD></TR><TR><TD><P>Anger, disgust, elation, fear, subjection, tender-emotion, wonder</TD><TD><P>Relation to instincts</TD></TR><TR><TD><P>Pain, pleasure</TD><TD><P>Unlearned emotional states</TD></TR><TR><TD><P>Anger, disgust, anxiety, happiness, sadness</TD><TD><P>Do not require propositional content</TD></TR><TR><TD><P>Expectancy, fear, rage, panic</TD><TD><P>Hardwired</TD></TR><TR><TD><P>Anger, interest, contempt, disgust, distress, fear, joy, shame, surprise</TD><TD><P>Density of neural firing</TD></TR><TR><TD><P>Fear, love, rage</TD><TD><P>Hardwired</TD></TR><TR><TD><P>Happiness, sadness</TD><TD><P>Attribution independent</TD></TR></TABLE>