Survivors of traumatic brain injury often lose their ability to use natural speech to communicate and then rely on augmentative and alternative communication (AAC) devices. Survivors may also have concomitant cognitive communication disorders that negatively impact memory and organization skills. AAC devices need to incorporate a word retrieval organization strategy that is fast and effective. The current study compared the conditions of topic, place, and alphabet for message recognition. The participants were asked a delayed recall question to elicit a communicative response. Results showed that alphabet is significantly more accurate than place and significantly faster than place and topic. However, participants chose to retrieve words using all three strategies.
In a conditional discrimination (matching-to-sample), a sample is followed by two comparison stimuli, one of which is correct, depending on the sample. Evidence from previous research suggests that if the stimulus display is maintained following an incorrect response (the so-called penalty-time procedure), acquisition by pigeons is facilitated. The present research tested the hypothesis that the penalty-time procedure allows the pigeons to review and learn from the maintained stimulus display following an incorrect choice. It did so by including a penalty-time group for which, following an incorrect choice, the sample changed to match the incorrect comparison, thus providing the pigeons with post-choice 'misinformation.' This misinformation group acquired the matching task significantly slower than the standard penalty-time group (that had no change in the sample following an error). Furthermore, acquisition of matching by a control group that received no penalty time fell midway between the other two groups, suggesting that the pigeons did not merely take more care in making choices because of the aversiveness of penalty-time. Thus, it appears that in the acquisition of matching-to-sample, when the stimulus display is maintained following an incorrect choice, the pigeons can review or acquire information from the display. This is the first time that such an effect has been reported for a nonhuman species.
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