Neuroscience Foundations and Neural Mechanisms

Question 1

A patient with a split-brain surgery reads a paragraph with the left hand while the right hand holds a book. Which outcome best explains the observed behavior?

Accepted Answer

The left hemisphere processes the reading but cannot control the left hand.

Answer

The right hemisphere reads the text and directs the left hand to turn pages.

Answer

The corpus callosum still transmits visual information to the left hand.

Answer

Both hemispheres share the reading task, causing simultaneous hand movements.

Question 2

During a visual‑blindness experiment, a subject can navigate around obstacles without conscious sight. Which neural system primarily accounts for this behavior?

Accepted Answer

The primitive visual system shared with reptiles that guides eye movements.

Answer

The evolved mammalian visual system that provides detailed object recognition.

Answer

The somatosensory cortex that reconstructs visual images.

Answer

The auditory system that compensates for loss of vision.

Question 3

A researcher applies a strong depolarizing current to a squid giant axon and observes a rapid rise to +40 mV followed by a brief hyperpolarization. Which statement best describes the ionic events underlying the hyperpolarization phase?

Accepted Answer

Voltage‑gated Na⁺ channels inactivate while K⁺ channels remain open, allowing K⁺ efflux.

Answer

Na⁺ channels stay open longer than K⁺ channels, sustaining the positive peak.

Answer

Cl⁻ channels open, causing an influx of negative ions that drives the membrane below rest.

Answer

Ca²⁺ channels close, preventing further depolarization and causing the dip.

Question 4

In a neglect patient with right parietal damage, which of the following statements is most accurate regarding their perception of left‑side stimuli?

Accepted Answer

They can detect left‑side tactile inputs but often fail to attend to them behaviorally.

Answer

Both tactile and visual left‑side inputs are processed normally and reported accurately.

Answer

They are completely unable to feel any stimulus presented on the left side of the body.

Answer

Their visual field is narrowed, preventing any left‑side objects from being seen.

Question 5

Which of the following best explains why myelinated axons conduct action potentials faster than unmyelinated ones?

Accepted Answer

Myelin increases membrane resistance, reducing current leakage and enabling saltatory conduction.

Answer

Myelin provides a continuous extracellular fluid pathway that speeds ion diffusion.

Answer

Myelin adds more voltage‑gated Na⁺ channels along the axon, boosting depolarization speed.

Answer

Myelin shortens the refractory period, allowing successive spikes to follow more quickly.

Neuroscience Foundations and Neural Mechanisms

A patient with a split-brain surgery reads a paragraph with the left hand while the right hand holds a book. Which outcome best explains the observed behavior?

During a visual‑blindness experiment, a subject can navigate around obstacles without conscious sight. Which neural system primarily accounts for this behavior?

A researcher applies a strong depolarizing current to a squid giant axon and observes a rapid rise to +40 mV followed by a brief hyperpolarization. Which statement best describes the ionic events underlying the hyperpolarization phase?

In a neglect patient with right parietal damage, which of the following statements is most accurate regarding their perception of left‑side stimuli?

Which of the following best explains why myelinated axons conduct action potentials faster than unmyelinated ones?

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A researcher applies a strong depolarizing current to a squid giant axon and observes a rapid rise to +40 mV followed by a brief hyperpolarization. Which statement best describes the ionic events underlying the hyperpolarization phase?

Your next click
starts here.