Soervill J W, Somervill C Z
Percept Mot Skills. 1977 Oct;45(2):391-7. doi: 10.2466/pms.1977.45.2.391.
A visual cliff was constructed so that patterns could appear below the centerboard as "shallow" and "deep" or vertical to the centerboard as "near" and "far". Preference for the shallow side was significant only for chicks. Preference for the vertical pattern was significant for both chicks and rats. These findings indicate that both rats and chicks will descend to the nearer of two patterns in a non-cliff situation.
构建了一个视崖，以便图案可以在中央板下方呈现为“浅”和“深”，或者与中央板垂直呈现为“近”和“远”。仅雏鸡对浅侧有明显偏好。雏鸡和大鼠对垂直图案都有明显偏好。这些发现表明，在非悬崖情境中，大鼠和雏鸡都会朝着两种图案中较近的一种下降。
