ADHD

Updated 12 June 2017

ADHD may affect boys and girls in different ways

New research has found differences in the white matter microstructure of the brains of boys and girls, which might explain behavioural differences between boys and girls with ADHD.

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Attention-deficit/hyperactivity disorder (ADHD) manifests itself differently in the brains of girls than in the brains of boys, new research suggests.

The results may help scientists better understand how ADHD affects boys and girls in unique ways, the researchers said.

Neurological differences

"The findings showed differences in the white matter microstructure between boys and girls," said study co-author Lisa Jacobson, a paediatric neuropsychologist at the Kennedy Krieger Institute, in Baltimore. White matter helps different regions of the brain communicate with each other.

"These structural differences were associated with observed behavioural differences," Jacobson said. "Taken together, our findings provide preliminary evidence for unique differences in the brain's white matter structure and function between boys and girls with ADHD."

Kathryn Moore, a psychologist at Providence Saint John's Child and Family Development Centre in Santa Monica, California, said, "Females are more likely to present with the inattentive symptoms of ADHD, while males are more likely to present with hyperactive and impulsive features of ADHD."

Read: What is ADHD?

Moore, who was not involved with the new research, noted that the study authors could not explain the reasons for their findings. ADHD is also diagnosed in boys at about twice the rate as in girls, she said, but this study does not necessarily explain why that is.

"The most striking finding in this study is that there are differences in brain functioning between boys and girls with ADHD," Moore added. "Perhaps the disorder of ADHD is caused by these neurological differences, or perhaps ADHD causes these neurological differences."

For the study, 120 children between the ages of 8 and 12 had a type of MRI called diffusion tensor imaging, which allows researchers to see neurological differences in the brain. Half of the children had been diagnosed with ADHD. The children without ADHD were matched to the children with ADHD, based on age, IQ and handedness (being left- or right-handed). Each of the groups, with and without ADHD, had 30 boys and 30 girls.

Rates of maturation

The researchers found several differences in the white matter of children with ADHD compared to those without ADHD, but the variations showed up in different parts of the brain based on gender.

In boys with ADHD, the differences showed up in the primary motor cortex, a part of the brain responsible for controlling basic motor functions. In girls with ADHD, the differences appeared in the prefrontal regions of the brain, which control motivation and ability to regulate emotions, the study authors said.

Read: Symptoms of ADHD

It's possible that the differences seen relate to how the different sexes mature, suggested Dr Glen Elliott, chief psychiatrist and medical director of Children's Health Council in Palo Alto, California.

"Boys and girls differ in a number of different ways, obviously including rates of maturation," Elliott said. He added that differences in the brains of males and females are present even during foetal development.

"Certainly some aspects of these findings might be reflective of previous studies done by other researchers showing that ADHD is associated with a delay in maturation, especially of frontal brain structure," Elliott said.

Moore explained that the differences seen in the brain functioning of people with ADHD, regardless of sex, is generally in the same larger region of the brain, the frontal lobe. The frontal lobe controls executive functioning, which involves "impulse control, decision-making, cognitive flexibility and planning", she said.

Additional interventions

Elliott said: "Possibly more relevant are the findings that, as they move through their teens into adulthood, boys with ADHD tend to get into trouble with externalising problems, such as conduct disorder and reckless behaviours, while girls with ADHD have, in general, a more internalising presentation, with depression, anxiety, eating disorders and self-harm."

But none of this might make a difference in how the disorder is treated, Elliott said.

Read: Treating ADHD 

"The 'why' of these differences remains unclear and could well be associated with quite distant other parts of the brain that connect to the regions being studied," Elliott said. "Similarly, the findings do not really suggest unique treatment options."

The primary first-line treatment for ADHD is still medication, usually stimulants, Moore said.

"Most psychologists would also advocate for additional interventions, such as using rewards and consequences to shape behaviour, learning better problem-solving skills and increasing effective communication between parents and the child," Moore added.

The study findings were published in the Journal of the American Academy of Child and Adolescent Psychiatry.

Read more: 

ADHD harder on women

Girls with ADHD faces the risk of suicide  

Could ADHD be a visual problem?


 

Ask the Expert

ADHD Expert

Dr Renata Schoeman has been in full-time private practice as a general psychiatrist (child, adolescent and adult psychiatry) since 2008, currently based in Oude Westhof (Bellville). Renata also holds appointments as senior lecturer in Leadership (USB) and as a virtual faculty member of USB Executive Development’s Neuroleadership programme. She serves on the advisory boards of various pharmaceutical companies, as a director of the Psychiatric Management Group (PsychMG) and is the co-convenor of the South African Society of Psychiatrist (SASOP) special interest group for adult ADHD, and co-founder of the Goldilocks and The Bear Foundation (www.gb4adhd.co.za) She is passionate about corporate mental health awareness and uses her neuroscience background to assist leaders in equipping them to become balanced, healthy and dynamic leaders that take their own and their team’s emotional, intellectual, social health and physical needs into account. Renata is academically active and enjoys research and collaborative work, has published in many peer-reviewed journals, and has presented at local and international congresses. She is regularly invited to present at conferences and to engage with the media. During her post-graduate studies, she trained at Harvard, Boston in neurocognition and neuroimaging. Her awards include, amongst others, the Young Minds in Psychiatry award from the American Psychiatric Association, the Discovery Foundation Fellowship award, a Thuthuka award from the NRF, and a MRC Fellowship. She also received the Top MBA student award and the Director’s award from USB for 2015. She was a finalist for the Businesswomen’s Association of South Africa’s Businesswoman of the Year Award for 2016, and received the Excellence in Media Work award from SASOP during 2016.

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