More “Trap Bias”

Whenever I read statistics about the “increasing rates of autism”, I heave a big sigh. Those statements invariable contain a whole number of assumptions, many of them flat-out wrong, or at least unexamined. In the epidemiological data, there are diagnostic issues and census issues and statistical issues and of course, the inevitable agenda issues in the reportage of the census results and analyses. I’ve previously discussed a number of these problems, including incidence versus prevalence, and correlation versus causality in the post, “Epidemics of Bad Science vs Epidemics and Bad Science”

What I would like to address today is a related issue with diagnostics and perceived prevalence, meaning, “How do we know who has autism or AD/HD or a learning disability, and how many such people are out there?”

In entomology (and in other zoological branches) we have a concept known as “trap bias”. There are a number of ways of taking a census of an animal population, including using traps. A “trap bias” means that the kind of trap you use to census a population will limit the responders to your census, and thus create unintended biases in the results.

Now, if a few synapses in your brain just fizzled from that wordy definition, let’s try a simple example. Read the rest of this entry »


Mystery Jam and Other Achievements

I lost a label. I don’t mean the sticky label missing from the jar of “mystery jam” in my pantry (the goo is yellow, so I’m pretty sure it’s last summer’s ginger-pear jam), but rather a diagnostic label. For many parents, one of the highlights or milestones in life is for their child to “lose the label”.

Once-upon-a-time the getting that label (or labels) was highly important, so everyone knew what the problem was (well, sorta) and so the child could get some kind of educational or therapeutic services. Getting the label was oft times a relief because it meant that Someone Official had recognised that the child’s problems were not due to bad parenting, moral failure, or general laziness on the child’s part. Usually parents suspected something was “off” for quite a while, so having that validated is a bit of a relief.

Of course, then once the suspicions are confirmed, there are often new kinds of feelings while adjusting to the new daily reality. Frequently there are skirmishes with school districts or other bureaucracies. Sometimes there’s a bit of a grieving process for not having the perfect little darlings imagined during pregnancy. Some families have issues with relatives not understanding, accepting or even “believing in” whatever problem with the child is dealing with. Nasty episodes can erupt in extended families if one of the parents is accused of “causing” the problem or bringing “bad blood” to the lineage.

And of course, a number of parents eventually realise that the child’s issues are echoes of some of their own issues. Going through these things is very complex, sometimes stressful, and often enlightening. Having a child with a disability does not automatically tear a family apart or make the siblings resentful; depending upon how the parents respond to the issues and to each other, it can strengthen the family members’ ties to each other, and lead people to be more compassionate and less judgmental.

So losing the label can mean that the family has (finally!) managed to get beyond a lot of those stresses. Or so it seems.

But what does it really mean to “lose the label”? It can mean a number of things. Read the rest of this entry »

How hard can it be?

A few years ago I had the pleasure of providing the annual Inservice training session for a university’s tutoring department. One of the themes I explored in brief was how tutees, especially those with various learning disabilities, may have processing difficulties. We have to take information in, make sense of it, retrieve information, and then be able to relay information back. Various kinds of learning disabilities interfere with steps in this process, and the interference can happen at more than one step, especially when a person has more than one kind of difficulty. (Learning disabilities and other physiological issues are often co-occurring, technically known by the dreadful-sounding term of “comorbid”.)

The upshot of all this is that any “speed-bumps” or “road-blocks” in the processing will result in slow processing (it takes longer to do things), or uneven processing (some days it’s more difficult to do things, not always for apparent reasons), or intermittent or chronic inabilities to do things (being able to do things on some days or in some hours, but not others, can be more frustrating than never being able to do them).

There are a variety of disabilities out there, but instead of describing how each one can affect a person’s ability to respond in educational efforts, I’m going to describe how processing works in general, and at which steps some disabilities become apparent.

Whenever we interact with the world, there is a whole series of steps that has to happen. Let’s take the subject of, “Answering a question asked of you”. Most people assume that this is really simple, and thus, easy. Hah! Read the rest of this entry »