Percent damage to amygdala and orbital prefrontal cortex in the four operated subjects
| Case | Amygdala | Orbital prefrontal | ||
|---|---|---|---|---|
| Hemisphere | Percent damage | Hemisphere | Percent damage | |
| Op1 | L (first) | 42.9 | R (second) | 65.5 |
| Op2 | L (second) | 34.9 | R (first) | 73.3 |
| Op3 | R (first) | 95.3 | L (second) | 57.1 |
| Op4 | R (second) | 28.4 | L (first) | 41.1 |
| Mean | 50.4 | 59.3 | ||
The hemisphere in which each lesion was placed (left, L; right, R) and the order in which the surgeries were conducted are indicated. For example, case Op1 received a neurotoxic amygdala lesion in the left hemisphere before beginning behavioral testing and a lesion of the orbital prefrontal cortex in the right hemisphere, with forebrain commissurotomy in the same surgery, to complete the disconnection. See Figure 1 for a schematic of the behavioral testing sequence.