Neuroscience and Brain Localization: Cortex, Hemispheres, and Functions

What are the three main cell types in the brain?

Neurons, glia, and blood vessels.

What is the primary function of the cerebral cortex?

It is important for perception, language, memory, planning, and executive function.

How many lobes does the brain have, and what are they?

Four lobes: Occipital, Temporal, Parietal, and Frontal.

What is the difference between gray matter and white matter?

Gray matter consists of cell bodies and synapses, while white matter consists of myelinated axons connecting distant neurons.

What is a sulcus?

A sulcus is a concavity or groove in the cortex.

What is a gyrus?

A gyrus is a convexity or bump in the cortex.

What role does the hypothalamus play in the brain?

It regulates body functions such as temperature and blood pressure, and controls the 'Four Fs': Feeding, Fighting, Fleeing, and Reproduction.

What are the basic functions modulated by the brainstem?

Functions such as heart rate, breathing, swallowing, and alertness.

What is phrenology?

An early theory that bumps on the skull corresponded to personality traits.

What modern method is used for brain localization?

fMRI scans, which depend on blood flow to create functional images of the brain.

What does the principle of modularity of mental functions suggest?

Mental functions can be divided into separate categories or independent processes.

What is the concept of localization of function in the brain?

Different cognitive functions are carried out by independent parts of the brain.

What is functional specialization in the cortex?

Different parts of the cortex serve different functions.

What is topographic organization in the brain?

Sensory and motor areas contain a map of the receptor surfaces or muscles.

What are contralateral connections in the brain?

The right side of the cortex is connected to the left side of the body and vice versa.

What are primary sensory areas?

Areas that receive direct input from sensory surfaces.

What is the primary motor area responsible for?

It sends axons to motor neurons in the brainstem and spinal cord, producing muscle twitches upon stimulation.

What are association areas in the brain?

Areas beyond primary sensory areas that receive inputs from other sensory areas.

What is the significance of the frontal areas of the brain?

They are important for initiating, planning, controlling, and assessing behavior.

What was the outcome of the Phineas Gage accident?

His behavior and personality changed, affecting his ability to plan and control behavior.

What does the Marshmallow Experiment study?

It studies delayed gratification and its correlation with future success.

What brain area is associated with better self-control in delayed gratification?

Greater engagement of the prefrontal cortex.

What is the role of the ventral striatum in delayed gratification?

It shows greater responsiveness to immediate rewards in low delayers.

What is the function of the occipital lobe?

It is primarily responsible for visual processing.

What is the function of the temporal lobe?

It is involved in processing auditory information and memory.

What is the function of the parietal lobe?

It processes sensory information related to touch and spatial awareness.

What is the function of the frontal lobe?

It is involved in reasoning, planning, problem-solving, and emotional regulation.

What influences the effects observed in fMRI studies of self-control?

Family and socioeconomic factors

What part of the brain shows greater engagement in high delayers?

Prefrontal cortex

What part of the brain shows greater activity in low delayers?

Ventral striatum

What is the nerve impulse also known as?

Action potential

What does synaptic transmission refer to?

The process of communication between nerve cells

What is the term for the part of space that a sensory neuron responds to?

Receptive field

What is the 'homunculus' in neuroscience?

Topographic maps of the muscles and body surface in humans

What does topographic organization in the brain refer to?

The mapping of sensory and motor areas to the receptor surface or muscles

What happens to sensory maps after finger denervation in monkeys?

They can move around, demonstrating plasticity

What is contralateral connection in the nervous system?

The right side of the cortex is connected to the left side of the body and vice versa

What is the role of the corpus callosum?

It connects the two hemispheres of the brain and facilitates communication between them

Which hemisphere is typically more important for language functions?

The left hemisphere

What is the significance of split-brain patients in neuroscience?

They provide insights into hemispheric specialization and communication

What does the right hemisphere excel at?

Spatial representation and non-verbal tasks

What is the phenomenon where input from one body part invades the area of another after sensory loss?

Phantom limb phenomenon

What does the term 'asymmetry of higher functions' refer to?

The specialization of functions in each hemisphere of the brain

In a split-brain experiment, what happens when an image is flashed to the left visual field?

The subject cannot verbally identify it but can select it by touch with the left hand

What is the primary function of the right hemisphere in split-brain patients?

It can see and feel stimuli but is mute and cannot generate speech

What is the relationship between the amount of cortex and motor control?

The amount of cortex corresponds to the fineness of motor control

What does 'plasticity' in sensory maps imply?

Sensory maps can change and adapt based on experience or injury

What is the role of the left hemisphere in interpreting behaviors?

It generates theories to explain behaviors based on sensory input

What happens when the right hemisphere is presented with a stimulus?

It can process the stimulus but cannot verbally report it

What is the effect of damage to the right motor cortex?

Inability to move muscles on the left side of the body

What is the effect of damage to the right somatosensory cortex?

Inability to feel sensations on the left side of the body

What is the significance of the left visual field in relation to the right hemisphere?

It is represented in the right hemisphere, which processes visual information

What is the primary function of the left hemisphere in split-brain patients?

It controls speech and language processing