| The upper (cerebral) left A | analytical, mathematical, technical and problem solving. |
| The lower (limbic) left B | controlled, conservative, planned, organised and administrative in nature. |
| The lower (limbic) right C | interpersonal, emotional, musical, spiritual and the "talker" modes. |
| Upper (cerebral) right D | imaginative, synthesising, artistic, holistic and conceptual modes. |