Neuroscience: Nervous System, Neurons, and Sensory Processing

What system controls and coordinates most bodily functions?

The nervous system.

What is the approximate number of neurons in the human brain?

100 billion neurons.

How many synapses do neurons make in the brain?

100 trillion synapses.

What is the typical speed of action potential conduction in myelinated axons?

About 10 m/s.

Who was the first to reliably measure the speed of neural conduction?

Hermann von Helmholtz.

What is a synapse?

The junction between neurons that permits information transfer.

What is a neurotransmitter?

A chemical substance used in neuronal communication at synapses.

What does the concept of localization of function refer to?

Certain parts of the brain are specialized to perform specific functions.

Who formulated the doctrine of specific nerve energies?

Johannes Müller.

What does the doctrine of specific nerve energies state?

The nature of a sensation depends on which nerve fibers are stimulated.

What are cranial nerves?

Twelve pairs of nerves that originate in the brain stem and reach sensory organs.

What is the role of sensory organs in relation to the brain?

They feed information to the brain.

What is neural representation of a sensory stimulus?

The pattern of neural activity that corresponds to a sensory stimulus.

What is neural encoding of a stimulus?

The process by which a sensory stimulus gets represented in the brain.

What is decoding of a neural representation?

Figuring out what sensory stimulus is present based on neural activity.

What is parallel processing in the context of sensory stimuli?

Considering different aspects of a stimulus simultaneously.

What do sensory representations include beyond the external stimulus?

Cognitive, physiological, and emotional information.

What is the significance of sensory representations?

They build a model of the world combining various types of information.

What can limit the decoding approaches in neuroscience?

The complexity of neural representations and the variability of stimuli.

What is the relationship between sensory activity and neural activity in the brain?

Sensory activity drives neural activity.

What is the implication of brain damage on sensory function?

It can disrupt sensory function.

How do neuroscientists decode neural activity?

Using machine learning approaches to gain insight into neural representation.