Which of the following cognitive skills has not been demonstrated by non-human animals according to current research in cognitive psychology?

• A. Solving novel problems through insight
• B. Using tools to obtain food
• C. Demonstrating basic numerical abilities
• D. Using complex language with grammar and syntax equivalent to human language

Answer: (D)

Verified step by step guidance

1. Step 1: Understand the question is asking which cognitive skill has NOT been demonstrated by non-human animals according to current research in cognitive psychology.
2. Step 2: Review each option and consider evidence from animal cognition studies: animals have shown the ability to solve novel problems through insight, use tools to obtain food, and demonstrate basic numerical abilities.
3. Step 3: Recognize that while animals communicate, the use of complex language with grammar and syntax equivalent to human language has not been demonstrated in non-human animals.
4. Step 4: Conclude that the cognitive skill not demonstrated by non-human animals is the use of complex language with grammar and syntax equivalent to human language.
5. Step 5: Understand that this distinction highlights the unique complexity of human language compared to animal communication systems.