Sentence:  Since emotional reactions in the higher <WSD>vertebrates</WSD> depend on individual experience and are aroused in man , in addition , by complex symbols , one would expect that the hypothalamus could be excited from the cortex . 
Meaning of the word marked with <WSD> tags:  animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium