The corpus callosum is a wide set of nerve fibers that connects the two hemispheres of the human brain. Agenesis of the corpus callosum, a rare birth defect, results in impaired cognitive abilities (e.g. key processes like face processing and other socially-important skills).

Substantia nigra is named for it's darker appearance relative to its surroundings. It is dark because of high amounts of neuromelanins in its tissues—an apparent byproduct of dopamine production. The substantia nigra is subdivided into two functionally distinct sections: the pars compacta and pars reticulata.

In order to examine brain functions, researchers must examine living individuals, rather than the brains of cadavers. This poses several challenges. Sometimes, animal brains are studied using invasive techniques that would be unethical to perform on human subjects. In order to mitigate these challenges and study brain activities, researchers in psychology have developed several noninvasive techniques including PET scans, MRIs, and electroencephalograms. 

The correct answer is frontal lobe. The frontal lobe is responsible for reward, attention, short-term memory tasks, planning, and motivation. It is also the part that tells a person if they are making a good decision or not. If the frontal lobe is injured, people may not realize they are behaving socially unacceptably. The other choices are incorrect. The parietal lobe is responsible for processing sensory information from your environment. The occipital lobe is responsible for eyesight processing. The temporal lobe is responsible for hearing and memory input. Last, the anterior lobe does not exist.

The parietal lobe is responsible of the sensory integration of taste, temperature, and touch. If someone damages their parietal lobe, then they will experience difficulty with sensory integration.

The nucleus accumbens has long since been considered a key anatomical structure in the body's reward and reinforcement system. It is one of the key producers and regulators of neural dopamine, and has been linked to several different addictive behaviors—including addictive reinforcement from food, sex, drugs, music, and maternal behavior. It is considered part of the "pleasure center" for the brain due to its release of reinforcing dopamine.  

The rCBF refers to the regional cerebral blood flow, a noninvasive procedure that detects broad patterns of neural activity based on increased flow to different brain areas. CAT scans, PET scans, and MRIs are all computerized scanning techniques but not specialized to test blood flow in the brain.

The hippocampus—located in the brain's temporal lobe—is the center for making, storing, and retrieving memories. Damage to this particular area is likely to result in difficulty with one or all of these memory-related processes.

Acetylcholine or aka ACH is the neurotransmitter that is released from the axon terminal to through the neuromuscular junction across the synaptic cleft.

Physiological testing (e.g. blood screenings, radiologic scans and hormonal level measures) have shown that in male primates including humans, cortisol and stress levels have a moderate positive correlation, whereas this correlation is weakly negative in females of the same species.