• Question: Hi, I was just wondering what causes speech impediments? If everybody’s biology is the same why do some people have lisps or stammers?

    Asked by to Suzanne, Sophie, Nadine, Ioannis, Daniel, Carolyn, Alyssa on 8 Jan 2018. This question was also asked by .
    • Photo: Sophie Scott

      Sophie Scott answered on 8 Jan 2018:

      There’s probably not one single reason – sometimes it’s to do with anatomy (e.g. having one paralysed vocal cord can make your voice sound very ‘different’). More commonly there are brain systems implicated – for example in stammering – and sometimes there are genetic issues (for example some spoken language disorders have a hereditary component), which will likely still be having it’s effects in the brain.