Free Psychology Degree Biological Bases of Behavior Questions and Answers — Questions and Answers
Question 1: A patient experiences a stroke that results in expressive aphasia, characterized by difficulty in producing fluent, grammatical speech, while language comprehension remains largely intact. This clinical presentation is most indicative of damage to which specific area of the brain?
- Wernicke's area in the temporal lobe
- The primary motor cortex in the frontal lobe
- Broca's area in the frontal lobe (Correct answer)
- The angular gyrus in the parietal lobe
Correct answer: Broca's area in the frontal lobe
Broca's area, located in the frontal lobe of the dominant hemisphere (usually the left), is responsible for speech production, articulation, and grammatical structure. Damage to this area leads to Broca's aphasia, where a person struggles to form complete sentences but can still understand spoken language. Wernicke's area is for comprehension, the motor cortex controls muscle movement but not language formulation, and the angular gyrus is involved in processing language-related visual information.
Question 2: Which of the following physiological responses would be initiated by the parasympathetic nervous system?
- Increased heart rate
- Stimulation of digestion (Correct answer)
- Dilation of pupils
- Inhibition of salivation
Correct answer: Stimulation of digestion
The parasympathetic nervous system is responsible for the body's 'rest and digest' functions. It works to conserve energy and is antagonistic to the sympathetic nervous system. Stimulating digestion, slowing the heart rate, constricting the pupils, and promoting salivation are all parasympathetic responses. The other options are all functions of the sympathetic ('fight or flight') nervous system.
Question 3: A researcher wants to conduct a study that requires identifying the precise brain regions that become active, as measured by blood flow changes, when a participant solves a complex puzzle. Which neuroimaging technique offers the best spatial resolution for this purpose?
- Electroencephalography (EEG)
- Computed Tomography (CT)
- Functional Magnetic Resonance Imaging (fMRI) (Correct answer)
- Transcranial Magnetic Stimulation (TMS)
Correct answer: Functional Magnetic Resonance Imaging (fMRI)
Functional Magnetic Resonance Imaging (fMRI) is the most suitable technique for this scenario because it measures brain activity by detecting changes in blood oxygenation and flow. It provides excellent spatial resolution, allowing researchers to pinpoint specific structures and regions involved in a task. EEG has superior temporal (time) resolution but poor spatial resolution. A CT scan provides structural images but no information about function. TMS is a method for stimulating brain regions, not imaging them.
Question 4: The myelin sheath is a fatty substance that insulates neuronal axons. What is its primary function in the nervous system?
- To synthesize neurotransmitters
- To provide the neuron with metabolic energy
- To serve as the primary site for receiving signals from other neurons
- To increase the speed and efficiency of nerve impulse transmission (Correct answer)
Correct answer: To increase the speed and efficiency of nerve impulse transmission
The primary function of the myelin sheath is to act as an insulator for the axon, which dramatically increases the speed at which electrical signals (action potentials) travel along the neuron. This process, known as saltatory conduction, allows the impulse to 'jump' between the nodes of Ranvier, making transmission much faster and more energy-efficient. Neurotransmitters are synthesized in the cell body, energy is provided by mitochondria, and signals are received by dendrites.
Question 5: A person sees a threatening stimulus, and their brain almost instantaneously processes the danger and initiates a physiological fear response, such as an increased heart rate, even before they have consciously appraised the situation. This rapid, automatic emotional processing is primarily governed by which brain structure?
- Hippocampus
- Thalamus
- Amygdala (Correct answer)
- Cerebellum
Correct answer: Amygdala
The amygdala, part of the limbic system, is the brain's key center for processing emotions, particularly fear. It can receive sensory information rapidly and trigger an immediate 'fight or flight' response via its connections to the hypothalamus and brainstem, often before the cortex has had time for conscious processing. The hippocampus is mainly for memory, the thalamus is a sensory relay station, and the cerebellum coordinates movement.
Question 6: Which brain structure acts as the primary link between the nervous system and the endocrine system by controlling the pituitary gland, and is also central to maintaining the body's homeostasis?
- Pons
- Hypothalamus (Correct answer)
- Basal Ganglia
- Corpus Callosum
Correct answer: Hypothalamus
The hypothalamus is a crucial brain region that maintains homeostasis (a stable internal environment) by regulating functions like body temperature, hunger, and thirst. It serves as the main interface between the nervous and endocrine systems by producing releasing and inhibiting hormones that control the actions of the pituitary gland, often called the 'master gland' of the endocrine system.
Free Psychology Degree Biological Bases of Behavior Questions and Answers
A patient experiences a stroke that results in expressive aphasia, characterized by difficulty in producing fluent, grammatical speech, while language comprehension remains largely intact.
This clinical presentation is most indicative of damage to which specific area of the brain?