Dudkin Elizabeth A, Peiffer Teri, Burkitt Benjamin, Neeb Christopher N, Gruberg Edward R
Biology Department, Pennsylvania State University, 25 Yearsley Mill Rd, Media, PA 19063, United States.
Behav Processes. 2011 Jan;86(1):138-42. doi: 10.1016/j.beproc.2010.11.002. Epub 2010 Nov 16.
Frogs are able to respond to a prey stimulus throughout their 360° ground-level visual field as well as in the superior visual field. We compared the likelihood of frogs choosing between a more nasally located, ground-level prey versus a more temporally located ground-level prey, when the prey at the nasal location is further away from the frog. Two crickets were presented simultaneously at 9 pairs of angles that included both crickets in the binocular visual field, both crickets in the monocular visual field, or one cricket in the binocular field and one in the monocular field. Frogs chose the more nasally located prey at least 71% of the time when the more temporal prey was in the monocular field; and 64% of the time when both prey were in the binocular field. Frogs tended to choose the more nasally located prey, even though it takes the frog longer to reach the prey. In addition, when given a choice between a prey located at ground level versus a prey located in the superior field, frogs tend to choose the prey at ground-level. These results suggest that there is a neural mechanism that biases frogs' responses to prey stimuli.
青蛙能够在其360°的地面视野以及上方视野中对猎物刺激做出反应。我们比较了青蛙在选择位于更鼻侧的地面猎物与位于更颞侧的地面猎物时的可能性，此时鼻侧位置的猎物离青蛙更远。同时在9对角度呈现两只蟋蟀，包括两只蟋蟀都在双眼视野中、两只蟋蟀都在单眼视野中，或者一只蟋蟀在双眼视野中而另一只在单眼视野中。当更靠颞侧的猎物在单眼视野中时，青蛙至少71%的时间会选择更靠鼻侧的猎物；当两只猎物都在双眼视野中时，这一比例为64%。尽管青蛙到达更靠鼻侧的猎物花费的时间更长，但它们倾向于选择该猎物。此外，当在地面的猎物和上方视野的猎物之间进行选择时，青蛙倾向于选择地面的猎物。这些结果表明存在一种神经机制，使青蛙对猎物刺激的反应产生偏差。
