“Women are more likely than men to predominantly use the left hemisphere of the brain, while men are more likely than women to predominantly use the right hemisphere of the brain.”

Males had greater rightward lateralization of brain connectivity in superior temporal (short- and long-range), inferior frontal, and inferior occipital cortices, whereas females had greater leftward lateralization of long-range connectivity in the inferior frontal cortex. The male brain was more rightward lateralized than the female brain. The lateralization of short-range connectivity was stronger for males than for females (rightward lateralized), whereas lateralization of long-range connectivity was stronger in some regions for females (leftward) and in others for males (rightward).

The results establish that male brains are optimized for **intrahemispheric** and female brains for **interhemispheric** communication. Males had a higher HCR in the frontal, temporal, and parietal lobes bilaterally, indicating a higher connection within the hemisphere and within lobes. In females, both of the values indicated across-hemispheric lobar connections. Greater interhemispheric connectivity in females would facilitate integration of the analytical and sequential reasoning modes of the **left hemisphere** with the spatial, intuitive processing of information of the **right hemisphere** (citing behavioral differences where females outperform on attention, word/face memory, social cognition, and males on spatial processing).

Sex differences were also prominent on all major brain parameters, including higher rates of cerebral blood flow, higher percent of gray matter tissue and higher **inter-hemispheric connectivity** in females compared to higher percent of white matter and greater **intra-hemispheric connectivity** in males. In men the percentage of GM was higher in the **left hemisphere**, the percentage of WM was symmetric, and the percentage of CSF was higher in the **right hemisphere**. Behaviorally, males are on average better at tasks requiring spatial processing and motor speed whereas females outperform males on tasks requiring verbal and facial memory and social cognition.

Neuroscientists would be well-advised to take the null hypothesis seriously: that men and women's brains are fundamentally similar, or “monomorphic”. The idea that men and women have fundamentally different brains has prevailed among scientists and non-scientists alike. MRI studies have been grappling with this for more than three decades but yet to find distinct features that define the “male brain” versus “female brain” across the human species.

The pattern of predominantly right hemisphere lateralization for men and left hemisphere lateralization for women may even generalize beyond traditional 'limbic' regions such as the vmPFC and amygdala. In conclusion, there is growing evidence that the functional lateralization of emotion and decision-making in regions such as the vmPFC and amygdala is significantly modulated by sex, such that right-sided lesions in men and left-sided lesions in women cause the greatest impairments.

These differences in lateralization have been attributed to an increased cooperation between the hemispheres in women due to sex hormone actions on inter-hemispheric connectivity along the female menstrual cycle. Building on previous studies, we hypothesize stronger activation in the overall verbal fluency network, particularly the left IFG and stronger lateralization of brain activation during verbal fluency, for men compared to women.

No differences were found between the sexes in lateralization of activity in any region of interest or in intrahemispheric cortical activation patterns. Functional MRI (fMRI) was used to examine gender effects on brain activation during a language comprehension task. A large number of subjects (50 women and 50 men) was studied to maximize the statistical power to detect subtle differences between the sexes.

University of Utah researchers have debunked that myth through identifying specific networks in the left and right brain that process lateralized functions. ... finding no relationship that individuals preferentially use their left-brain network or right-brain network more often. "It's absolutely true that some brain functions occur in one or the other side of the brain. ... But people don't tend to have a stronger left- or right-sided brain network."

Our results suggest that gender differences are encoded in both brain structure and brain function, but in different manners. The univariate analyses revealed that gender differences were detected in both structural (i.e., GMV) and functional (ReHo or FC) imaging measures, mainly manifested as greater values in females than in males in regions of the frontal, parietal, occipital lobes and cerebellum. Importantly, there was little overlap between the differences detected in GMV and those detected in ReHo and FC.

There is a popular myth that claims that men and women's brains process information differently... However, scientific research does not support the distinction between the “male” and “female” brain. This idea is a myth that society uses to perpetuate gender norms and stereotypes. ... more recent research found that there is no significant sex difference in the extent of left hemisphere lateralization.

Meta-analysis of studies that assessed handedness in males and females yielded a higher prevalence of left-handedness in males, with a mean weighted odds ratio indicating sex-related differences in lateralization patterns.

Women showed more bilateral activation of a brain region during the language tasks than the males, who were more lateralized to the left side of their brain. Meanwhile, the opposite was true during the visual-spatial task — with men showing more bilateral activation in another area while processing visual information than females, who were more lateralized to the right side.

Reviewing over 20 years of neuroscience research into sex differences in brain structure, a Cambridge University team has conducted the first meta-analysis of the evidence... Males on average had higher brain volume (adjusted for total intracranial volume) in bilateral ventral temporal and occipital regions, and larger volumes in left transverse temporal gyrus (Heschl’s gyrus), left posterior cingulate, left precuneus, right anterior cingulate, right thalamus, right putamen, right caudate, right precentral gyrus, right superior temporal gyrus, right inferior frontal gyrus, right medial frontal gyrus, right orbitofrontal cortex, right medial frontal gyrus, right superior frontal gyrus, right precentral gyrus, right postcentral gyrus, right paracentral lobule, right superior parietal cortex, right angular gyrus, right supramarginal gyrus, right precuneus, right cuneus, right lingual gyrus, right fusiform gyrus, right cerebellum.

In studies examining connections within the brain, it has been found that **women tend to have stronger connections side to side**, which could lead to better intuitive thinking, analyzing, and drawing of conclusions. **Men, on the other hand, tend to have stronger connections from front to back**, which can result in heightened perception and stronger motor skills. That said, women have been found to use more **white matter**, which connects processing centers, while men use more **grey matter**. This could explain why men tend to excel at task-focused projects, while women are more likely to excel at language and multitasking.

The research examining sex-specific brain mechanisms finds variability in structure, neurotransmitters, and the expression of specific genes in males and females. Many people assume that brain differences between men and women result from sex hormones like estrogen and testosterone. This is not true. In fact, increasing numbers of studies find large reliable distinctions between the sexes.

Neuroscience research consistently demonstrates that while both sexes show hemispheric specialization, women tend to exhibit more bilateral representation of cognitive functions (particularly language), whereas men show stronger lateralization with greater right-hemisphere dominance for certain spatial and emotional processing tasks. However, these are statistical tendencies with substantial individual variation and overlap between sexes.