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re:[B]关于训练解读他人想法的能力的研究[...
关于训练解读他人想法的能力的研究
Ozonoff和Miller是最早研究是否可以训练解读他人想法能力这个课题的(1995)。对象是5个高功能自闭症或广泛发育障碍的青少年。早期的研究发现,少数自闭症患者通过训练可以完成诸如Sally-Anne这类任务的第一级心智测验(译者注:请参考《“雨人的秘密”--解读自闭症之谜》第72页:Sally有个篮子,Anne有个箱子。Sally把球放入篮子中,然后出去散步。 Sally外出期间,Anne从篮子中取出球,放入箱子中。Sally回来后,会到哪里去找球?自闭症儿童倾向回答到箱子里去找,因为他们不会站在Sally的角度想问题),高功能的甚至能通过第二级测验。由此我们可以乐观地相信,功能相对高一点的自闭症经过训练,有通过更高级的心智测验的潜力。在训练的前后,分别进行四个心智转换的任务测试,它们是:
1。 Smarties测试,“错误内容”(Perner: False contents task)
2。 第二级错误信念,“Mary认为John在想....”(Baron-Cohen)
3。 第二级错误信念,“外套大衣”(Bowler: overcoat task)
4。 第三级错误信念,“虚张声势”(Happe:Dobule bluff story)
教师和家长同时使用社交技巧衡量表(SSRS:Social Skill Rating Scale)对儿童社交技巧进行评估。(译者注:我对这个衡量表非常感兴趣,求之不得)
因为这个干预要经过相当长的时间(四个半月),重要的一点是要判断儿童的进步是否是自然发育的作用。 为此,4个年龄,智商,程度相仿的青少年(CARS打分相同)作为对比组,对比组也在开始和结束时参加同样的测试,只是中间没有参加特殊干预。
(以下部分先放上英文, 有时间再翻)
The first set of seven training sessions focused on teaching interactional and conversation skills such as how to begin and maintain topics of conversation, how to choose topics of interest to others, how to interpret and express non-verbal signals, and how to listen and express interest in others. The second set of sessions focused specifically on teaching theory of mind skills. The main focus of the training was role playing exercises with the emphasis on providing underlying problem-principles that might be applied to different situations. These sessions began with a role playing exercise in which children led a blindfolded trainer around an obstacle course. This was designed to teach the children how to take another person's visual perspective. Next the children were taught that what someone sees or hears indicates what they will know(i.e. the principle that 'perception influences knowledge'). Finally the children took part in a series of role-plays which mirrored the format of second-order false-belief tasks, although the specific content was different from the transfer tasks(e.g. Using different locations). For example, in one role-play children A,B,and C decide to go bowling together. After child A leaves to get changed at home, B and C revise the plan and decide to go to a film instead. B and C then go home separately. On the way home, B stops at A's house to tell him of the new plan. They agree to meet at the cinema and A leaves to go there. After changing, C stops at A's house and find he is not there. The groups members were asked to predict where C would think A had gone. After each of these scenarios the group discussed the underlying principle behind the role-plays. For example, for second-order false-belief role-plays, the principle was that 'since child C had not seen child B speak with A, he could not know that A knew of a revised plan.
Prior to training, the group scored an average of 6 out of a possible composite score of 13, although it it not clear from the results exactly which tasks the children were failing and which they were passing. When the children who had taken part in the training control group. However, the training appeared to have no effect on everyday social skills may have been because the SSRS did not provide a sensitive measure of the sort of skills one might expect to improve as a result of training. For example, the SSRS includes items such as 'is self confident in social situations' and 'is liked by other'. Alternatively, the improvement on the theory of mind task may have been the result of learning a specific non-mental rule which was applicable to some of theory of mind task in the battery, rather than learning to use mental-state terms. This is certainly possible given that the second-order role-plays involved the same scenarios as the second-order transfer tasks. This at least suggests that limited generalisation to different materials and characters can take place, even with a non mental-state rule. It is also possible that some children learned to infer mental states and to generalise this knowledge. A non mental-state rule learned for the second-order role-play scenario could not be used to pass the third-order double bluff task, and at least one child achieved this, since he achieved a maximum score after training. Unfortunately, since only composite score were presented we cannot be sure if any of the other children improved on task other than the second-order false-belief tasks. However, with this small sample of relatively high-functioning adolescents with autism the result were promising.
A group of less able children with autism(CA between none and ten years, VMA between five and six years) took part in training study conducted by Hadwin et al.(1996,1997). In this study the intention was to asses whether it would be possible to teach children with autism in one of three domains; (i)understanding of emotion;(ii)understanding of belief; or (iii)production of pretend play.
Thirty children with autism took part in the study. Prior to the training all the children were tested on tasks from each of the three domain. In each domain there were five tasks which were ordered into 'developmental levels', so that a level 1 task was the simplest and level 5 the most difficult. In the emotion domain the tasks were:(i)photographic face recognition; (ii)schematic face recognition;(iii)situation-based emotion understanding; (iv)desir-based emotion understanding; and (v)belief-based emotion understanding. In the belief domain the task were;(i)simple perspective taking; (ii)complex perspective taking;(iii)seeing leads to knowing; (iv)true belief understanding; and (v)false belief understanding. Finally, the five levels of play behaviour were:(i)sesorimotor paly; (ii)functional play(two or fewer examples); (iii)functional play (more than two examples);(iv)pretend play(two or fewer examples);(v)pretend play(more than two examples). For the pre-training assessment each child was presented with tasks in order from level 1 onwards until two consecutive levels were failed. The pre-training assessment therefore established a developmental level's score for each child in each domain.
Two additional assessments of conversation skills and use of mental-state words were also made before and after training. Children were asked to tell a story from a picture book and the frequencies of:(i)one-word answers; (ii)two or more sentences; (iii)echolalia; and (iv)unclear statements, were recored. Parents were instructed to ask questions and give prompts during the story telling in order to create a conversation-like interaction. The hypothesis was that improved theory of mind might help the child to understand that people know different things and that states of knowledge can be shared, so that theory of mind training would result in children expanding upon their 'conversation'. The frequency of mental-state words produced during this assessment was also recorded.
For the training itself, the children were divided into three groups, and each group was taught in a particular domain--emotion, belief, or pretence. The pre-training assessment indicated at which level teaching should begin for each child. For the emotion and belief groups each child was taugh on tasks in subsequent levels by question-and-answer with corrective feedback, and in addition was given a general principle governing the understanding of the mental state involved in the task. The teaching strategy in the pretence group, by contrast, was spontaneous and unstructured. The aim here was simply to encourage children to produce and participate in pretend play acts with a series of toys related to a theme(e.g shopping or dinner-time), and junk objects, using modelling and verbal guidance. Training took place over eight consecutive days with one half hour session per day.
The result showed that children in the emotion and belief groups improved in their performance on the task they were being trained on. For the children trained in pretence there was no significant improvement in performance. Of course this does not mean that pretending is therefore harder to train than emotion of belief understanding--the children may have failed to produce more pretending because of the materials used or the type of training used, etc. All we can conclude is that the children in this study did not learn to produce more pretend play acts as a result of this particular training technique.
When children from each group were re-tested on the task from all three domains following training, the results revealed that children trained in one domain did not improve in their performance on tasks from another domain. That is, there was no evidence of generalisation between theory of mind domains. The children also showed no significant change in the ability to expand on conversation, and no change in the number of mental-state terms used during conversion. Thus, despite improvement on theory of mind task used during training, there was no evidence of an improvement in conversation skills. However, the children did pass task similar to the ones they had learned to pass during training, but which used different materials. Whilst this suggests that a limited degree of generalisation was possible, it was still not clear what was being generalised--new knowledge about inferring mental state or a non mental-state rule for passing the tasks.
What we cannot tell from either Ozonoff and Miller's or Hadwin et al.'s studies is whether the failure to generalise to novel tasks is a problem specific to autism. It is possible that children without autism, but which the same mental age, would show the same problems in generalising if trained on the same tasks. One way to investigate this possibility is to include control groups who are trained on the same tasks as the children with autism and assessed in the same way.Swettenham attempted to do this by including eight children with autism, eight three-year-olds, and eight children with Down's Syndrome in a theory of mind training study. The aim was was to teach children from each group to pass the Sally-Anne false-belief task with repeated presentations of a computer version of the task. Generalisation was then assessed with five post-training false-belief tasks, all of which had been failed by all children proir to training. Two of these tasks involved the same scenario as the training tasks--a computer version without instruction and the Sally-Anne task with dolls--and were refered to as the close transfer tasks since they required minimal generalisation. The other three transfer tasks also assessed understanding of false belief but used different scenarios to the training task. These were two versions of deceptive-appearance false-belief task based on Perner et al. 1987; and the Tom(theory of mind) task, in which the child is told abouta character's fasle belief, and asked to predict to his behaviour. These tasks were referred to as distant transfer task as they required a greater degree of generalisation. Importantly, it was thought that the distant transfer tasks could not be passed by the use of a non mental-state rule learned during training.
In addition, the children were given four true-belief tasks before and after training. These computer presented tasks involved scenario in which the ball is not transferred from one location to another--for example, Sally hides the ball in location A, Anne removes the ball and then replaces it in the same location(A). All the children passed these true-belief tasks prior to training.
The computer version of the Sally-Anne task was mouse driven and include music,text, and animation, which characters hiding and retrieving a ball in one of two locations as in the conventional presentation. The initial hiding place for the task varied randomly. The child was instructed to click the mouse on characters, or on a door on the screen, in order to move through the sequences of the task. Throughout each presentation prompts appeared on the screen explaining what the characters were thinking. For example, after initially hiding the ball Sally says, "Now I think the ball is in the red/blue box", and, "I must rember to look in the red/blue box if I want my ball". When Anne transfers the ball she explains, and, "Sally hasn't seen me move her ball", "Sally will think that the ball is in the red/blue box". At the end of each presentation of the task the child was asked to select the container where Sally thinks her ball is. If the child is correct the character approaches the container, looks inside and exclaims,"Oh no, the ball is not there anymore." If the child choose incorrectlys,Sally replies,"I think the ball is in the red/blue box because that's where I left it."
Each child received a set number of 48 trials, divided into eight sessions over the course of week. All three groups showed a steady rate of increase in the number of correct trials per session--althrough, surprisingly, it was the group of children with Down's Syndrome who had the lowest mean score throughout training. The children with autism and the three-year-olds consistently passed 5 out of 6 trials per session earlier than the children with Down's Syndrome. Children from all three groups were able to pass the close transfer tasks following training, suggesting that they were all capable of generalising what they had learned to tasks similare to those used for training, but which involved different materials. In contrast, none of the children with autism passed any of the distant transfer tasks, whilst five of the three-year-olds and five of the children with Down's Syndrome passed at least one of the distant transfer tasks following training. The same results were found when the children were re-tested on the transfer tasks three month later.
Since the children with Down's Syndrome and the three-old-years were able to generalise what they had learned to pass tasks which involved different scenarios to the trained task, it seems likely that they had learned to infer mental states during training. Howeverm the children with autism failed to generalise what they had learned to help them pass the distant transfer tasks. One possible reason for this may have been that children with autism learned the simple rule;"Sally always thinks the ball is in the container that is empty'. This rule would alway lead to success on the Sally-Anne false-belief task. However, if this rule was then generalised to a rule-belief task, in which the ball is replaced in its original location, then the rule would lead to an incorrect answer. The results showed that children with autism continued to pass the true-belief tasks following training. This meant that either they had not learned that rule("Sally always think the ball is in the container that is empty") during training, or that they had not applied the rule to the true-belief task. So, this study showed that children with autism could learn to pass the false-belief task, but, unlike normal three-year-olds or children with Down' Syndrime, they were unable to generalise what they learned.
There is another method that tell us whether children with autism can learn to understand false-belief, rather than learn a non mental-state rule, without requiring evidence of generalisation. In order to learn a non mental-state rule during a training study, a child would have to be given the correct solutions to the trials. If children with autism can learn to pass false-belief tasks without being given information on or reinforcement for the correct response, then this would presumably be evidence that the children had learned to infer false belief.
Bowler and Stromm attempted to help children pass the Sally-Anne false-belief task without directly providing the correct answer on each trial. Instead, they provided action and emotional cues to the protagonist's false beliefs(based on Moses and Flavell 1990), and also gave the children the opportunity to experience their own false belief in a similar scenario. All the children in the study initially failed the Sally-Anne false-belief task. All the tasks were presented with real people playing the roles of Sally and Anne. [I](to be continued)[/I] |
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