David E. Copeland

Situation models and aging

Younger and older adults were tested for their ability to process and retrieve information from texts. The authors focused on the construction and retrieval of situation models relative to other types of text representations. The results showed that during memory retrieval, younger adults showed superior memory for surface form and textbase knowledge (what the text was), whereas older adults had equivalent or superior memory for situation model information (what the text was about). The results also showed that during reading, older and younger adults were similar in their sensitivity to various aspects of the texts. Overall, these findings suggest that although there are age-related declines in the processing and memory for text-based information, for higher level representations, these abilities appear to be preserved. Several possibilities for why this is the case are discussed, including an in-depth consideration of one possibility that involves W. Kintschs (1988) construction-integration model.

Walking through doorways causes forgetting: Situation models and experienced space

We investigated the ability of people to retrieve information about objects as they moved through rooms in a virtual space. People were probed with object names that were either associated with the person (i.e., carried) or dissociated from the person (i.e., just set down). Also, people either did or did not shift spatial regions (i.e., go to a new room). Information about objects was less accessible when the objects were dissociated from the person. Furthermore, information about an object was also less available when there was a spatial shift. However, the spatial shift had a larger effect on memory for the currently associated object. These data are interpreted as being more supportive of a situation model explanation, following on work using narratives and film. Simpler memory-based accounts that do not take into account the context in which a person is embedded cannot adequately account for the results. This research was supported in part by a grant from the Army Research Institute, ARMY-DASW01-02-K-0003 and by funding from J. Chris Forsythe of Sandia National Laboratories.

Working memory and situation model updating.

Situation model updating requires managing the availability of information as a function of its relevance to the current situation. This is thought to involve some aspect of working memory. The present study assesses the relation between updating ability and various measures of working memory span or capacity. In addition, a primitive general measure of situation model processing, a situation model identification test, and its relation to updating ability was also assessed. The present experiment used a version of a paradigm developed by Glenberg, Meyer, and Lindem (1987) to assess updating. Although updating was observed in both anaphoric reading time and recognition test accuracy measures, the reading time measure was relatively weak. Importantly, the updating effect on the recognition test was unrelated to working memory capacity. In contrast, updating was related to performance on the situation model identification task. Specifically, people who were good at model processing were better able to keep associated objects available than were people who were less adept. There were no differences in the maintenance of dissociated objects. These results suggest that the relationship between situation model processing and working memory capacity is relatively weak.

Working memory and syllogistic reasoning

The purpose of this study was to examine the relation between working memory span and syllogistic reasoning performance. In addition, performance for the reasoning task was compared to predictions made by mental model theory and the probability heuristics model. According to mental model theory, syllogisms that require the use of more mental models are more difficult. According to the probability heuristics model difficulty is related to the number of probabilistic heuristics that must be applied, or (for invalid syllogisms) inconsistencies between the derived and correct conclusion. The predictions of these theories were examined across two experiments. In general, people with larger working memory capacities reasoned better. Also, the responses made by people with larger capacities were more likely to correspond to the predictions made by both mental model theory and the probability heuristics model. Relations between working memory span and performance were also consistent with both theories.

Aging and Situation Model Updating

The aim of this study was to investigate age differences in narrative comprehension and memory, with a focus on the updating of situation models during comprehension. While there are large effects of aging on memory for propositional textbase information, there is very little evidence that older adults have difficulty at the situation model level. Because described events are often dynamic, a comprehender must consistently update their situation model to make it consistent with the new information. The current experiments investigated whether there are any age differences associated with the ability to update a situation model along the spatial and temporal dimensions. Although updating effects were observed, they were largely not influenced by age. The relation of these findings to an understanding of older adults’ language comprehension and memory performance is discussed.

Phonological similarity in working memory.

That phonologically similar words in a short-term memory test are more difficult to recall than phonologically dissimilar words is a well-known phenomenon. This effect is thephonological similarity decrement. In the present study, we examined whether this phonological similarity decrement is present when additional semantic information is available, as in a reading span test, as compared with a standard presentation, or in the context of an operation span test. The results revealed a phonological similarity facilitation. Phonologically similar words were remembered better than phonologically dissimilar words.

Reading Times and the Detection of Event Shift Processing

When people read narratives, they often need to update their situation models as the described events change. Previous research has shown little to no increases in reading times for spatial shifts but consistent increases for temporal shifts. On this basis, researchers have suggested that spatial updating does not regularly occur, whereas temporal updating does. The current study looked more deeply into this reading time pattern for spatial updating. If the prior interpretation is correct, then the absence of a reading time increase reflects a failure to update the situation model. Two experiments evaluated this claim by assessing whether other indicators of updating, namely memory probes, converge on a similar interpretation as that derived from the reading time data. Our results showed that, in contrast to previous accounts, although there was no change in the pattern of reading times, spatial updating was occurring and was extensive. As a comparison, we also looked at temporal updating. Unlike spatial updating, the temporal shifts had an influence on reading time but did not have as extensive an influence on memory probe performance. (PsycINFO Database Record (c) 2009 APA, all rights reserved).

Functionality and spatial relations in memory and language.

We examined whether the functionality of spatial relations affects the construction and memory of information in situation models. A functional relationship involves the interaction of entities that is implied by either typical use or contextual demands. Previous research has shown that spatial relations are less likely to be encoded during comprehension unless there is extensive prior knowledge, explicit instructions to attend to spatial information, or a clear emphasis on spatial information. If the construction of a situation model is guided by a need to understand the functional structure of a situation, then functional spatial relations should be more likely to be encoded. The results of our study showed that sentences with functional spatial relations were read faster and remembered better in both recall and recognition tests than sentences with nonfunctional spatial relations.

Working memory span and situation model processing.

This study looked at how comprehension and memory processing at the situation model level is related to traditional measures of working memory capacity, including the word span, reading span, operation span, and spatial span tests. Issues of particular interest were the ability to remember event descriptions, the detection and memory of functional relationships, the detection of inconsistencies, sensitivity to causal connectivity, and memory for surface form, textbase, and situation-specific content. There was little evidence that traditional measures of working memory span were directly related to processing at the situation model level. However, working memory span was related to our few textbase-level tests.

A Novel Study: Investigating the Structure of Narrative and Autobiographical Memories

In two experiments we assessed the degree to which memory for events are similar or differ depending on whether they were narrative or autobiographical events. Consistent with previous research on autobiographical memory, memories for events captured the sequential order of events. However, in contrast to autobiographical memory research, ratings of importance did not appear to be related to retrieval speed. An analysis of causal connectivity of the recalled events was significantly related to retrieval speed. Issues of narrative comprehension and memory, autobiographical memory, and their overlap are discussed.