| More sophisticated tools, long-distance trade, language, and the earliest art accompanied the encephalization. |
| Ecology and energetics of encephalization in hominid evolution. |
| The resulting degree of encephalization is unique, and clearly causes some qualitative differences in language, tools and social organization. |
| Complex adaptations tend to evolve gradually, and the trend toward encephalization is no exception. |
| Moreover, a trend toward increased encephalization within many mammalian taxa is widely recognized. |
