Search
-
- Glossary
Habenulae
The habenulae – literally translated as "the reins" – are part of the epithalamus (which is part of the diencephalon) and are primarily involved in the modulation of monoamine neurotransmitters (dopamine, serotonin).
-
- Glossary
Habituation
If stimuli are repeatedly presented without having any effect, habituation to these stimuli occurs. This weakens the response and, over time, it disappears completely.
-
- Glossary
Hammer
The first of the small ossicles in the middle ear. It is connected to the eardrum and transmits the vibrations caused by sound waves via the other two ossicles (incus, stapes) to the cochlea, where the stimulus is converted into a neural signal.
-
- Glossary
Haptics
Haptic perception is based on the sensory cells of the skin and depth sensitivity. It is an active process that allows the shape, structure, weight, temperature, etc. of an object to be explored. Haptics is the "science of touch."
-
- Glossary
Hebbian theory
Hebbian theory is the hypothesis postulated in 1949 by Canadian psychologist Donald Hebb that the synaptic connection between two neurons is strengthened when both are active at the same time. This principle forms a cellular basis for learning and memory. "Neurons that fire together, wire together" – they form a common connection.
-
- Glossary
Brightness
Brightness is one of the dimensions of visual perception: the perception of light intensity. It influences the size of the pupil.
-
- Glossary
Hemiparesis
In medicine, hemiparesis refers to incomplete paralysis of one side of the body. It occurs as a result of damage to the central nervous system, such as that caused by a stroke. Since nerve centers in the right hemisphere of the brain control movement of the extremities on the left side of the body and vice versa, hemiparesis typically occurs on the side of the body opposite to the site of the damage.
-
- Glossary
Hemisphere
The cerebrum and cerebellum each consist of two halves – the right and left hemispheres. In the cerebrum, they are connected by three pathways (commissures). The largest commissure is the corpus callosum.
-
- Glossary
Inhibition
Neuronal inhibition describes the phenomenon whereby a sender neuron sends an impulse to a receiver neuron, causing the latter's activity to decrease. The most important inhibitory neurotransmitter is GABA.
-
- Glossary
Heschl's gyrus
Heschl's gyrus is an area in the temporal lobe that was first described by Richard Heschl in 1855. It is the seat of the primary auditory cortex, i.e., the hearing center in the cerebral cortex.
