NEUROPSYCHOLOGY L7

n case of a shutdown of the left hemisphere, ipsilateral (homolateral) an apraxia of the left hand can occur.

apraxia is: not being able to execute a movement, in the presence of an intact sensori-motor system. 

Why can in case of a shutdown of the left hemisphere, ipsilateral (homolateral) an apraxia of the left hand  occur ?

An apraxia of the left hand occurs as the right hemisphere needs the left hemisphere for getting information about motor programs (also paraphrased as motor engrams).  In other words, the left hemisphere is dominant for fine motor functions, for motor engrams.  In other words, you need the left hemisphere for fine motor programs (engrams), on both sides, also on the left side. Is this issue clear to you all now?

motor engrams =fine motor functions

- the ( right/left) hemisphere is dominant for fine motor functions, for motor engrams

- the (right/left) hemisphere needs information about motor engrams

Another issue was the difference between the left and right hemisphere concerning their 'overall' organization.

The ( right/left) hemisphere has a more 'specialized' organization whereas the (right/left) hemisphere has a more diffuse organization. Particularly this diffuse organization is ideal for visuospatial information processing; after all, visuospatial information processing also has a more 'diffuse' character. Similarly, the (right/left) hemisphere is dominant for arousal. Indeed, arousal is not something that takes place at a certain location in the brain, arousal holds fore the whole brain, more diffuse thus.

(right/left) hemisphere  has more specialized organization

- dominant for language

(right/left) hemisphere  has more

- diffuse organization

- ideal for visuospatial information processing

- dominant for arousal

language (is/is not) an exclusive function of the left hemisphere; also the right hemisphere (has/ has not) a language function, e.g. comprehension of language.

the (left/right) hemisphere is dominant for language, the (left/right) hemisphere is dominant for visuospatial information processing. 

With respect to gender difference in brain function:

there is some support that (females/males) have a stronger left hemisphere, and (females/males) have a somewhat stronger right hemisphere.

Please note: those studies concern GROUPS and not individuals.