Read this the other day and it made me giggle, for anyone with interest/knowledge of fMRI.
Read this the other day and it made me giggle, for anyone with interest/knowledge of fMRI.
About four years ago I proof read a book for my psychology teacher from my high school. It’s now available to download, for a very reasonably small price (it’s worth tons more, so you’re really getting a great deal buying it now!)
It’s a brilliant novel, and I’d highly recommend it to anyone who has an interest in fantasy, the afterlife, philosophy, or for those who just enjoy a good book!
Feedback about it is encouraged, I’d love to know what others think. It’s rare to read something that others haven’t and I want to be able to talk about it with like minded individuals.
Listening to this on iplayer right now. Science: From Cradle to Grave. About longitudinal studies in medicine and health. It’s presented by the lovely Dr. Ben Goldacre, with his wonderful voice.
My sister has cerebral palsy and additional brain damage (mostly to her right hemisphere) that has caused her to have severe learning difficulties and epilepsy. When she was adopted as a baby my mom was told she never learn to speak, let alone read or write. As she grew older the hours of speech therapy definitely paid off, and at 21 she can have as coherent a conversation as anyone (although she does sometimes need to repeat herself to people who don’t know her so well). However, whilst she has always been very chatty, her ability to read and write has wavered. I remember us being at school together (she is only a year below me in school years) and she’d be sent home with reading books aimed at 5 year olds when she was around 9 years old. It would seem as though she was learning to read quite well after you’d gone through the book a few times. She seemed able to read entire story books like Bif and Chip, if someone had gone through the book with her first, but it soon transpired that if you covered up the pictures, or made her attempt to read a randomly chosen page out of order then she was stumped. She’d memorise the books and regurgitate verbatim what someone had read out to her previously! I think this is a ‘trick’ common amongst young children learning to read, particularly because those story books are boring and repetitive.
For as long as I can remember her idea of handwritten words resembled something a 2 or 3 year old might scrawl when pretending to do “grown up writing”. A series of p’s that looked a bit like this:
With the arrival of a computer in our house it must be said that her ability to write single words did begin to develop but again she was merely mimicking what someone had shown her. It wasn’t uncommon to find a Word document saved under a name like ‘fsddh’ and open it to be faced with a list of ‘words’ such as Dog, Bog, Mog, Fog, Sog, Rog. It was a while before she began to put words together into sentences. The first one she wrote with no supervision is annoyingly burned into my memory.
It simply read: “ Olana is a fat pig”
She’d gone around the house asking different people to write down a single word from the sentence so she could copy it and put it together as a surprise.
Reading and writing has always been a part of her education, although I’d say it was never the main focus. Basic numeracy, social and ‘life’ skills were possibly the more important aspects, once she’d mastered writing her own name by hand. She still struggles with counting money but is more than capable of using a calculator for difficult sums if she needs to, she can also read time quite accurately these days.
In the past two years something rather different has happened when it comes to writing. She is now twenty one, and lives full time at an independent living centre for disabled adults, where she attends many different classes including numeracy and literacy lessons which are taught as an outreach class through the local college. In these she is slowly learning to put together her own words for the first time ever. I think one of the most useful things she has done in conjunction with these lessons is to have joined facebook. It’s turned out to be a perfect medium for her to practice putting together full sentences. The last part of this post will be made up of direct quotes from her posts and private messages she has sent me. As you will see it is almost as if she has developed her own way of writing, whilst it may not be correct in terms of spelling and punctuation most of the time, it is still readable to those who know what to look for.
Here is the first message she ever sent:
i ded not no nat d es on face book now
This isn’t too hard to understand if read aloud as if phonetically, it says ‘I did not know that D is on facebook now’. (D is our brother). The problem with reading out loud as if phonetically is that due to her cerebral palsy she doesn’t always pronounce words correctly, so she often spells them the way she says them, not as how they ‘should’ be said. For example a Remote Control is called a ‘remoke’ in our house.
I’ve tried looking at theories of language to find comparisons between the way my sister writes and development of reading skills but to very little avail. I have noticed that when she talks she often falls into the trap of over generalising a rule to words that are not regular. So that she will say things like ‘we drived home’ instead of ‘drove’, which is something younger children only begin to do once they start learning to read and write at school, but never did previously.
There are certain consistencies in my sisters use of language when writing that we’ve learnt to interpret (and although we have tried to correct her on these they have remained). Examples of these are things like always writing ‘Pes’ instead of ‘Please’, which makes some sense if you hear how she pronounces please in speech. The most persistent and confusing of all however is her use of ‘ec’ instead of ‘ing’, so ‘going’ is always ‘goec’.
i am goec to bed naw can i toc to u at 11pm pes
(I am going to bed now can I talk to you at 11pm please)
I’ve tried to work out why ‘ec’ has replaced ‘ing’ in her mind, some ideas are that when she pronounces ‘ing’ she is making a ‘cah’ or ‘kuh’ sound at the end so puts a ‘c’, or that on a keyboard capital G and C look quite similar so she’s confusing the two letters. It could even be a bit of both I suppose. If it is that she’s confusing G and C on a keyboard you would expect this confusion to occur in other words where g is replaced with c. I have found a few examples of this:
can you pes gum up
(can you please come up)
i am up set be gos alex hos goc naw
(I am upset because alex has gone now)
It seems that she will replace G’s with C’s when the G occurs in the middle or ending of the word, and will replace C’s with G’s if the word begins with a C. However, she does know that ‘Ch’ makes a different sound to a C on its own as is demonstrated in this example:
i am sore fo chuteg a wa
(I am sorry for shouting at you)
Here she doesn’t stick with her usual ‘ec’ to replace ‘ing’ either. She’s made shouting into two distinct sounds created from ‘chu’ and ‘teg’, usually she never misspells ‘you’. Words ending in ‘y’ often become words ending in ‘e’ or ‘i’.. so Happy will be ‘hape’. I believe this is a common error made by young children when learning to write.
My favourite message from her was sent very early on and reads:
olana can u sop tacec the nec at of me i dot lic et won u sa i cut rit pes
(Olana can you stop taking the Mick out of me, I don’t like it when you say I can’t write, please)
I know it’s wrong that this made me laugh, but I never really took the Mick out of her (promise!)This referred to a private message she’d sent to our Mom asking her if she could get a new computer but she didn’t write the word ‘computer’ she instead wrote ‘cum pot’! In all seriousness though, I think it’s fantastic that she’s doing as well as she is despite having suffered such severe brain damage, she continues to exceed ours and the medical professionals expectations daily.
Her ability to put together sentences is growing, although the words aren’t spelt all that well they are usually easy enough to decipher. We went to see Tim Minchin perform in December last year and her status became ‘I lic tim minchin’ (lic is like, although she probably wouldn’t say no to licking him either!) She also wrote this message on his facebook fan page:
faku tim fo a gut cho nysnat i am gated theat i cud not met you i wech you cyt ta ta am fran can you dot
(Thank you Tim for a good show last night, I am gutted that I could not meet you. I wish you could *something I don’t understand* can you do)
As you can see sometimes the messages aren’t always all too clear, and I still struggle to understand everything she writes. The problem we then have is she can’t read her own words back, whilst she has no trouble constructing her little sentences if you ask her to read what she has written say a day later she won’t be able to tell you. Such as ‘i cum sot paec tec toc doc’ My best guess with this one is something like ‘I can’t stop playing tic tock doc?’ but I’ve no idea really.
She is also getting better at writing by hand, although her letters can still be quite big, she now spaces words out a lot clearer and will attempt capital letters where necessary.
The oddest thing about all of this I find is her comparably low ability to read despite her continued progress in her writing skills. Her brain-damaged being mostly right-sided is consistent with the suggestion that language and writing abilities are predominantly processes controlled by the left hemisphere. However, reading is also thought to be dominantly a right-sided processes, the strangest thing here is her inability to not only read ‘proper’ sentences but also failing to read back things that she herself has written. I hope that she can continue to develop her literacy abilities as she gets older, although at 21 I’m not sure how far she can progress or what is already set in stone, I guess only time will tell but for now she’s doing just fine.
so even more apologies for a lack of blogging in recent months. Lifes become hectic, who’d have thought a full time job would actually take up so much time!? I do love it though, but am missing writing LOTS.
So, I have 12 days off over the christmas period, and my pre new years resolution is to write at least three blog posts that have been waiting to be written for an age.
Will endeavor to do this in amongst stuffing my face with Terry’s chocolate oranges and watching Doctor Who (all the important things about christmas time).
Merry Christmas to everyone out there!
I couldn’t imagine loosing any of my senses, least of all my sight. To go blind slowly over time must be one of the most challenging illnesses a person can have to face. Knowing that there is nothing that can stop a hereditary degeneration of your sight must be heartbreaking, to say the least. Just imagine having the memory of what a flower covered in morning dew looked like as a sunbeam touched the tip of the petal, or being able to recall how you used to look in a mirror but can no longer see yourself, to know that there are wonders beyond most peoples own imaginations that are possible to observe in a sunset and to have all of that knowledge, that discover, taken from you along with your independence has to be one of life’s most unfair consequences of genetic illnesses.
Like any disability that worsens over time you’d hold on to the hope that one day science will find a cure, but it would seem an unfathomable wish for them to cure blindness. This is why the news that came out this week of a microchip that has the potential to restore at least the basic functions of sight seems almost too good to be true.
Some forms of blindness are caused by a degeneration of the photo-receptors within the eye. These are the cells that allow us to interpret light signals into meaning, by building on signals received about colour and brightness. With this information our brain is then able to construct the images that allow us to perceive the world around us. Clever, clever nature.
In people with degenerative eye conditions such as retinitis pigmentosa (RP) the optic nerve is left mostly intact. There are two ‘treatment’ options available at the moment, the first involves forms of gene therapy and other protective factors, which have been shown to slow degeneration in people with this and similar conditions. However, this has to be received at an early enough stage of the degeneration. The second option is what this current research focused on, and sounds more like something from a science fiction film than reality. They invoke electrical stimulation of the surviving retinal networks to try to produce some form of visual experience in people who’s level of degeneration is beyond that which might be helped by the other form of ‘treatment’. More specifically in this case a microchip is implanted under the transparent retina to act as electronic man-made ‘replacement’ photoreceptors.
The chips are able to sense light and create signals from this at many pixel locations. This is achieved using “microphotodiode arrays” or MPDA’s. There are 1500 pixel generating arrays on a chip, and each acts independently as a light sensitive electrode, this is subsequently able to provide an electrical stimulus to the neurons nearby. In this way it is unique to other approaches, within each element is the electrode set allowing for the electrical stimulation of neurons to be caused by the reception of light. There are also photodiodes found within the chip which allow for varied amplifications to be transmitted based on the level of light reception.
With the chip in place within the eye, the photodiodes are able to capture an image each, several times a second, simultaneously.
Illustration from the original paper found here . It gives a better demonstration of the set up of the microchip with the electrodes and MPDAs, and also a nice picture of an eye is always a winner. (I can remember dissecting an eye in alevel bio, it was fascinating)
It’s enough to make your head hurt to think about, I mean really. There are 1500 elements able to transmit signals from the photodiodes, which are able to capture an image in a ridiculously small time frame and transfer this into meaningful information by way of electrical impulses to the bipolar cells that would have originally received information from the rods and cones of the eye. With the amount of current that is sent by each electrode determinable by the brightness recorded by each photodiode. Oh, did I also forget to mention that the chip that all of this occurs on is a mere 4mm square in size!
In this trial study of ‘the chip’ three people with hereditary degenerative blindness were given the implant. They were tested 7 to 9 days after the implant with some psycho-physical tests. If they achieved well on these they went on to be tested for recognition of everyday objects. Due to the electrical nature of the chip it was possible for two test conditions to be employed for all these tests, a chip ‘on’ and chip ‘off’ baseline condition, which allowed for statistically significant results to be acquired.
All three patients were able to detect single electrode single pulse simulations, the perception of this varied slightly between patients but they all reported seeing the stimuli.
They went on to distinguish letters from one another, patient one begin able to tell the difference between U and I, and patient three going further by successfully distinguish four letters presented at random. Patients were also tested on pattern recognition, two of the three were able to correctly distinguish the direction of grid patterns, showing that the chips have high spatial resolution capacities.
Patient two show better recognition in further tests, and interestingly was the only patient of the three to have the chip placed in a slightly different part of the eye. In these cases the patient, identified as Miikka, was able to name objects presented in an unknown dining table situation, including distinguishing between a fork and spoon, as well as an apple and banana. In subsequent optional tests he went on to read his name (a clip that many will have seen on the news) and pointed out the fact that they’d made a spelling mistake!
The fact that they’d only had the chips in place for just over a week and this was having an impact on their perception of light is impressive enough, but for one participant to go on to read their own name is quite incredible for a first trial.
It’s difficult to find fault in this study, you could say it only worked very successful on one subject, but that wouldn’t be fair at all. It seems promising that all of the patients were able to respond to light stimuli in the first instances. There are any number of individual differences that might account for the relative different levels of impact that the chip had on all three participants. One might try to say the media exaggerated the findings in some way but the majority of the reports I saw were very careful to give a full background of the type of blindness that this is appropriate for, as well as the fact that it is very new technology and that it doesn’t ‘restore full sight’.
No questioning then that the results are truly remarkable, and although the success wasn’t replicated in all three subjects, all involved had slight improvements above the level of vision that they had previous to the implant. This research is clearly going to continue to develop into something more and more complex throughout its research future and I hope it can go on to be offered to people with RP more widely in years to come.
It is not often that there is a developement of such magnitude that I’d feel comfortable ending on such a hopeful and positive note but I really do think that this will one day be able to improve the everyday lives of those who have degenerative eye sight. I hope that it’ll go on to allow them to regain the independence that has been taken from them by their conditions and also relieving some of the demands on the carers who have to become their replacement eyes at the moment.
The original paper is:
Subretinal electronic chips allow blind patients to read letters and combine them to words
Eberhart Zrenner, Karl Ulrich Bartz-Schmidt, Heval Benav, Dorothea Besch, Anna Bruckmann, Veit-Peter Gabel, Florian Gekeler, Udo Greppmaier, Alex Harscher, Steffen Kibbel, Johannes Koch, Akos Kusnyerik, Tobias Peters, Katarina Stingl, Helmut Sachs, Alfred Stett, Peter Szurman, Barbara Wilhelm, Robert Wilke.
and a full free PDF can be found here !
Long time no bloggage. I am most sorry.
I have some notes on Barley to type up and some diagrams etc, and then mom has the odd video we can put up.
Not sure how conclusive my little tests have been, but as far as I know her ‘symptoms’ are pretty much the same as before, some days leaving food and other days eating it all.
I’ll be cracking on with some more thorough blogging soon. Have found a potential phd place to go for and will maybe write more about that soon as I want my blog to be part of my application in some way.
Ciao for now blogsphere.