Thanks to Stephen Downes for taking the trouble to provide a critique of my review of the fourth chapter of John Medina’s book Brain Rules. Rather than see it languish unnoticed as a comment, I thought I’d post it separately. First a few provisos:
- Stephen is responding to the verbatim extracts that represent my personal selection of highlights from the chapter in question. I presented these out of context and without any of the supporting evidence found in the book. I’m sure John would enjoy taking up the challenge of responding to Stephen, but I am not in a position to do so.
- In making the posting I was operating in my familiar role as bridge between the academics and the practitioner. I am a critical reader but do not profess to have a wide knowledge of all the available research in this area.
- It is in my nature to look for certainties and ‘truths’ and I must confess to some disappointment when these prove elusive. Nevertheless, I’d much rather see a vigorous debate of a set of ideas than blind adherence to principles that prove to be false.
Stephen’s comments are interspersed with the extracts:
Really? Wait a minute. Are these things even true? They don’t strike me as being true at all.
"The more attention the brain pays to a given stimulus the more elaborately the information will be encoded - and retained."
Um, no. For two reasons: First of all, memory is not proportional to attention. Yes, attention can influence memory. But our sharpest memories depend most of all on salience - whether something was crucial, pivotal, hurtful, etc. Second, we don’t "encode" memories. I know, we see the term used a lot, to lull us into thinking we somehow convert our perceptions into some sort of symbolic representation. But we don’t.
"Before the first quarter of an hour is over in a typical presentation, people usually have checked out."
Um… what is the evidence for that? What is ‘checked out" and how was it measured? For that matter, what is a "typical" presentation? presumably not the author’s, right?
"Emotionally arousing events tend to be better remembered than neutral events."
"Emotionally arousing"? Is this a technical term?
"Emotional arousal focuses attention on the gist of an experience at the expense of peripheral details."
What constitutes the ‘gist’ and what constitutes ‘peripheral details’? Particularly since an intense experience will be remembered entire, intact - see, for example, Romeo Dallaire describing his memories from Rwanda - "The soldiers remember clearly, digitally clearly, the shot firing, the cartridge ejecting, the child’s head exploding…."
"Our brains tend to be filled with generalised pictures of concepts or events, not with slowing fading minutiae."
Again - what does that mean? Our brains are not filled with _generalizations_ — so what are "generalized pictures"? Archetypes? Prototypes? Why not say that, instead of something that suggests something else?
"Start with the key ideas and, in a hierarchical fashion, form the details around these larger notions."
Well, that’s just the ‘pyramid’ style of writing, rewritten as a brain rule. But there are innumerable principles for organizing thought, many of which are not hierarchical. Indeed, organizing all thought hierarchically would not only be very difficult - some things just don’t lend themselves to that - but also pointless.
"We can’t multitask. People who appear to be good at multitasking actually have good working memories, capable of paying attention to several inputs, one at a time."
Sure we can. I’m watching a ball game right now. Funny - as I’m typing these words, a home run has been hit. I kid you not. (Jason bey, Boston, against the Angels).
"Studies show a person who is interrupted takes 50% longer to complete a task. Not only that, he or she makes up to 50% more errors."
Studies show lots of things. What would convert this to actual knowledge?
"The most common communication mistakes? Relating too much information, with not enough time devoted to connecting the dots. Lots of force feeding, very little digestion."
One wonders what the evidence for this is, or what makes it a ‘mistake’. Telling a story, for example, requires a lot of attention to detail, and often the readers ought to be left to connect the dots in their own ways. That’s why I’m still thinking about ‘For Whom The Bell Tolls’, several weeks after reading it.
Source: Clive Shepherd