Mirror Neurons
Friday, August 20th, 2010I recently read Mirroring People The new science of how we connect with others by Marco Iacaboni
It’s got a lot of very interesting information about how our brain works. When I have more time I may write about the ideas in the book. for now I’m just presenting my notes:
As adults, our gestures can be divided into two categories:
Iconic – pretending to do the thing being described.
Beat – don’t reflect what’s said. Are usually rhythmic.
Iconic gestures stimulate mirror cells.
Broca’s Brain – a major language center, imitation, hand motor actions
Babkin Reflex - Press a newborn’s palm and they’ll open their mouth
Babie open mouth before hand arrives.
9-15 weeks old extending index finger co-occurs with opening mouth and even vocalization.
Speech–gesture mismatch, gesture more advanced.
Mirror Neurons (MNs) – imitation, intention, goals, vision & sound, self-recognition, can acquire new properties like tool use & goals), pre-motor cortex.
Premotor cortex is linked to primary motor cortex.
Gestures lead, speech follows.
Embodied cognition – our mental processes are shaped by our bodies.
Words activate MNs.
McGurk Effect - “Ba” heard, “Ga” seen in lips, “Da” is “heard.”
We hear talk and mirror talking, which is necessary for understanding speech.
We synchronize bodies & bodies, actions, and speech.
Empathy: mirroring others’ feelings.
With a pencil in the mouth, mimicry is restricted and then it’s harder to detect others’ facial changes
We mimic expressions before recognizing them. MNs send signal to the limbic (emotional) system and then we feel expressions’ emotion.
People liked others who copied their actions, gestures, and stances better than people who didn’t copy.
The more imitative, the more empathetic people are.
The Parietal Operculum (receives sensory info from hands) had higher activity during imitation compared to real movement (hands). No MNs there. It’s related to the sense of self.
MNs fire for actions of self and other, but more strongly for self.
We have some MNs at birth, but the MN system is shaped by imitative interactions between self and others.
The MT, the brain area that responds to motion, responds to still photos.
Autism may be a problem with MNs imitation helps them.
Mu Rhythm is reduced when motor regions are active. Also when thinking about actions.
Imitation adds up action and observation MN activity.
Individual cells remember a person: “Grandmother cells” and sometimes “associates” ( like Granny’s husband, friends, etc.).
People who thought of professors answered later questions consistently better than those who thought of soccer hooligans.
Super Mirror Neurons in the orbitofrontal cortex, anterior cingulate cortex & presupplementary motor area fire when an action is performed, but shut down while observing actions.
Studies show that people do imitate media violence.
How autonomous are we really?
“Thirst” & “Dry” encourage increased drinking
Asked about attractive faces (pics) then asked about the one not picked why it was picked, only 10% of people realized they hadn’t picked that one.
Men had similar brain reactions to women’s faces , as to sports cars.
Blindfolded people chose Pepsi unless told brand names, then they chose Coke. The evaluating part of the brain vs. the executive control part of the brain.
Super Bowl Ads – verbal reports didn’t match brain mapping.
Negative ads win elections.
Political sophisticates answered with their Default State Network which has higher activity when you’re doing nothing.
For many, social relations are the Default State.
Intersubjectivity – the sharing of meaning between people.
Our sociality is a limiting factor of our autonomy.