📋 EXAM INSTRUCTIONS
Time: 75 minutes total |
Materials: Closed book, closed notes, simple calculator allowed
Sections: Part I (Short Answer: 40 pts), Part II (Longer Answer: 20 pts)
Instructions: Answer ALL questions. Write clearly. Show your reasoning for partial credit on longer questions.
Total Points: 60
📚 Study Guide: Use the
Comprehensive Review Scaffold to prepare—all questions on this practice exam are directly drawn from the review material.
Coverage: Chapters 0-6 (What Is a Thought? → Sensation and Perception)
⚠️ Note: This is a PRACTICE exam. Use it to identify knowledge gaps and practice time management. The actual midterm will follow this same format with similar question types.
Instructions: Provide concise answers explaining mechanisms and relationships. Focus on how and why, not just what.
1.
Binding Problem (5 pts)
Why is it remarkable that we perceive a "red apple" as a unified object rather than separate features? What is the proposed neural mechanism for binding?
2.
Lateral Inhibition (5 pts)
Explain how lateral inhibition creates edge enhancement in visual processing and why this circuit motif has been conserved for 500 million years.
3.
Gut-Brain Axis (5 pts)
How do gut bacteria influence brain function and behavior? Include the role of the vagus nerve and what neurotransmitters are produced.
4.
Refractory Periods (5 pts)
Distinguish between absolute and relative refractory periods. What causes each, and why are they important for neural signaling?
5.
Short-Term Plasticity (5 pts)
Define facilitation and depression at synapses. Explain the role of residual Ca²⁺ in facilitation.
6.
Dendritic Spine Types (5 pts)
Describe the four types of dendritic spines and their functional roles in learning and memory.
7.
Spinal Cord Independence (5 pts)
Explain how the spinal cord can produce reflexes and even walking patterns without brain input. What does this reveal about hierarchical organization?
8.
Phantom Limbs (5 pts)
Explain how predictive processing accounts for phantom limbs, and how Ramachandran's mirror therapy treats phantom pain.
Instructions: Write integrated paragraphs connecting multiple concepts. Include specific mechanisms, researcher names, and clinical examples where relevant.
9.
Energy Constraints and Neural Evolution (10 pts)
The human brain operates on 20 watts yet is 650,000× more energy-efficient than supercomputers. Explain how energy constraints shaped neural evolution and architecture. Your answer should describe where energy costs are highest (maintaining resting potentials, action potentials, synaptic transmission), explain evolutionary solutions that reduce costs (myelination, sparse coding), analyze tradeoffs between speed and efficiency, and discuss what happens when energy systems fail (ischemia, stroke). Include specific numbers where relevant (5×10⁻²¹ joules/bit, 20% of body energy, etc.).
10.
Plasticity: The Stability-Flexibility Tradeoff (10 pts)
The brain must learn new things without forgetting old ones, adapt to change while maintaining identity. Explain how multiple plasticity mechanisms operating across different timescales solve this stability-plasticity dilemma. Include: STDP solving credit assignment (millisecond timing), LTP/LTD strengthening/weakening synapses (hours to days), structural spine changes (days to weeks), systems consolidation (months to years), and how complementary learning systems (fast hippocampus, slow cortex) prevent catastrophic forgetting. Provide specific examples from Bliss & Lømo's LTP discovery, Hubel & Wiesel's critical periods, or London taxi drivers.
📚 How This Practice Exam Maps to the Review Guide
Part I: Short Answers Cover:
- Chapter 0: Binding problem (Q1)
- Chapter 1: Lateral inhibition, gut-brain axis (Q2-3)
- Chapter 2: Refractory periods (Q4)
- Chapter 3: Short-term plasticity (Q5)
- Chapter 4: Dendritic spines (Q6)
- Chapter 5: Spinal reflexes (Q7)
- Chapter 6: Phantom limbs (Q8)
💡 Study Strategy: Use the
Comprehensive Review Scaffold to study each chapter's integrative paragraphs (showing how concepts connect) and concept boxes (listing specific details). Every question on this practice exam tests material explicitly covered in the review guide.
🎯 Part II Integration: Questions 9-10 test your ability to synthesize across multiple chapters—exactly what the "Integrative Themes" section of the review guide prepares you for. These questions require connecting energy constraints (Ch 1-2), plasticity mechanisms (Ch 3-4), and organizational principles (Ch 5-6) into coherent explanations.