Startle reflex, explained

JDancer

My DH has developed a very sensitive startle reflex. The slightest noise startles him. Sometimes it seems his body lifts off the chair (or bed). I read something that explains it. Most of us remember the sounds we hear throughout the day- the neighbors slamming a car door, the sound of the refrigerator, the cat jumping on the counter, etc. With dementia, people lose these memories. It's like hearing each sound for the first time, so many of the sounds are alarming and elicit a startle reflex. I agree with this interpretation, because my DH will often ask, "what was that?"

Iris L.

The startle reflex is actually a primitive reflex that we all have from infancy.  It's called the Moro Reflex.  Primitive reflexes diminish as we mature, but may return with some diseases.  Also the sucking reflex may return.  There are articles online about this.  

Iris L.

JDancer

My understanding of the Moro reflex is a specific arm/leg movement seen during infancy. This is not exactly what I'm talking about. 

I had forgotten about the suckling reflex. I remember learning that if the cheek of a person with advanced dementia is stroked, they will turn their mouth in that direction like an infant seeking a breast. I'm almost afraid to try that with my DH...

Iris L.

I'm sorry, I didn't explain it well.  If you're interested you can read more about retained primitive reflexes in adults.  

Iris