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The Lateral Preference Inventory Coren (1993) developed an inventory for lateral preference (The Lateral Preference Inventory). Several items concerned ear preference. I found the choice of items to be quite interesting. See below for the items concerned with ear preference. Based on a large adult normative sample, a total score was created for the four ...


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You shouldn't. It is one of those stubbornly persistent myths. It is almost entirely false. It is true that in some tasks one half of the brain is more prominent (although even in supposed classic cases like speech both halves are actually involved, just one half more than the other). But the idea that one half of the brain is logical and the other ...


5

First, biological features do not always arise from some intrinsic benefit. They can also be byproducts of other adaptations, or spandrels. That being said, one example of a possible benefit is specialization. For instance, birds will develop asymmetries in their visual system based on light inputs to their outward-facing eye (one eye faces the eggshell, ...


4

It may have to do with language. The idea that language influences thought is called Linguistic Relativity: The more accepted weak version claims that linguistic categories and usage only influence thoughts and decisions. Lera Boroditsky summarizes research on the influence language has on direction and time: English speakers tend to talk about ...


4

Alien hand syndrome (AHS) is an extremely rare disorder. It is so rare, there appears to be no available prevalence studies. In the AHS literature, case studies are therefore nearly universal. For all intents and purposes, it is reasonable to say that AHS appears to be a disease so rare that the empirical prevalence rates are in every listed case ...


4

Short answer An animal study did not reveal any effects on the synchronization of the cerebral hemispheres after callosotomy, as based on EEG recordings. When one hemisphere showed sleep patterns on the EEG, the other half would show similar activity. Background If intact commissures are needed between the two hemispheres to synchronize the two halves of ...


3

The formal name for crossing in biology is decussation. It is thought to be a result of anatomical development as well as a recovery mechanism. Essentially, it's an emergent result of negotiations between genetics, development, and environment. I've emphasized the relevant sentences in two abstracts below. Abstract: The crossing of nerve tracts from ...


3

Short answer: Probably not. Let's first keep in mind that very few split-brain patients have ever been studied. Add to this that inner speech is not a well studied area in general. As the resulting Venn diagram suggests, there is next to nothing known about inner speech in split-brain patients. Second, remember that one of the key reasons why inner speech ...


3

Alright, so I'll give this question a go... Admittedly, I'm not really familiar with theories of emotion lateralization, but let's look at some meta-analyses for insight!!! As a quick theoretical note, a single study cannot confirm emotion-related lateralization. The representation of emotions or affect in the brain can change from context to context, ...


3

What is the dominant hemisphere in the first place? I found the following definition (source: Medical Dictionary): [The] dominant hemisphere [is] [t]he left half of the brain in almost all right-handed people and 85% of left-handed people. This is the hemisphere concerned with language and logical thought and containing the motor areas for voluntary use ...


1

Given how dynamic the interplay of systems involved in creating one’s experience of somatosensory perception is, as well as the rich neurobiological of individuals, I would say the answer to your question depends on the ‘we’ in question, as well as what might constitute a discernable difference in experience across the two sides of the body. That being ...


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Dichotic listening task can be helpful to identify if someone has right ear advantage (REA) or LEA.


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I've asked this question about dominance of brain hemispheres. in the question there are examples of drawings made by split brain patients using only one hand and eye at a time. I don't know if using both eyes while drawing produces different results, but the images suggest that the ability to process memory of objects is impaired:


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Basically the same as a normal two-halved brain. Circumstances in which function is altered are fairly limited. For details, see case reports on Wikipedia's split-brain page, and this episode of Scientific American Frontiers that features Mike Gazzaniga's research, as mentioned here. Gazzaniga's research was reviewed in a Nature news feature (Wolman, 2012), ...


1

From split brain studies I find it might be possible that the right and left hemisphere differences are caused from reading top down left to right. So perhaps learning a written language that reads right to left would prove beneficial. But from what I found walking also increases the corpus callosum. But walking is found to benefit the brain density in ...


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