Table 1.
Summary of immunofluorescence results.
| cell population | training phase | rostral VTA | caudal VTA | ||||
|---|---|---|---|---|---|---|---|
| SPRt | SPRu | RC | SPRt | SPRu | RC | ||
| FB+TH+c-fos+ | SA | — | — | — | ↑ | — | — |
| UA | — | — | — | — | — | — | |
| PL | — | — | — | — | — | — | |
| FB−TH+c-fos+ | SA | ↑ | ↑ | ↑ | ↑* | ↑* | ↑ |
| UA | — | — | — | — | — | — | |
| PL | ↑ | ↑ | ↑ | ↑ | ↑ | ↑ | |
| FB−TH−c-fos+ | SA | — | — | — | — | — | — |
| UA | — | — | — | — | — | — | |
| PL | — | — | — | — | — | — | |
Arrows indicate increased numbers of cells compared to cage control animals. Asterisks indicate significantly higher numbers in SPR rats than in reward controls. SA = successful acquisition; UA = unsuccessful acquisition; PL = plateau performance; SPRt = single pellet reaching, trained hemisphere; SPRt = SPR, untrained hemisphere; RC = reward control.