Biomedical subjects

Jerker Rönnberg

Publications and source records attributed to Jerker Rönnberg.

7 recordsLinked to original sources

PubMed2006

What people believe about memory.

Two representative samples of adult Norwegians (n=2000) were asked a set of general and specific questions regarding their beliefs and opinions about human memory. The results indicate that on many questions, such as time of the earliest memories, inhibiting effects of collaboration, and memory for dramatic versus ordinary events, the views of the general public concurred with current research findings, and people in general had realistic views about their own memory performance. On other questions, such as the reliability of olfactory as compared with visual and auditory memory, the memory of small children in comparison with that of adults, the likelihood of repression of adult traumatic memories, and on more general questions such as the possibility of training memory and the capacity limitations of long-term memory, a large proportion of the participants expressed views that are less supported by scientific evidence. Implications of these findings are briefly discussed.

Adult↗

PubMed2006

The face you recognize may not be the one you saw: memory conjunction errors in individuals with or without learning disability.

Memory conjunction errors, that is, when a combination of two previously presented stimuli is erroneously recognized as previously having been seen, were investigated in a face recognition task with drawings and photographs in 23 individuals with learning disability, and 18 chronologically age-matched controls without learning disability. Compared to the controls, individuals with learning disability committed significantly more conjunction errors, feature errors (one old and one new component), but had lower correct recognition, when the results were adjusted for different guessing levels. A dual-processing approach gained more support than a binding approach. However, neither of the approaches could explain all of the results. The results of the learning disability group were only partly related to non-verbal intelligence.

Adult↗

PubMed2005

Reversing spoken items--mind twisting not tongue twisting.

Using 12 participants we conducted an fMRI study involving two tasks, word reversal and rhyme judgment, based on pairs of natural speech stimuli, to study the neural correlates of manipulating auditory imagery under taxing conditions. Both tasks engaged the left anterior superior temporal gyrus, reflecting previously established perceptual mechanisms. Engagement of the left inferior frontal gyrus in both tasks relative to baseline could only be revealed by applying small volume corrections to the region of interest, suggesting that phonological segmentation played only a minor role and providing further support for factorial dissociation of rhyming and segmentation in phonological awareness. Most importantly, subtraction of rhyme judgment from word reversal revealed activation of the parietal lobes bilaterally and the right inferior frontal cortex, suggesting that the dynamic manipulation of auditory imagery involved in mental reversal of words seems to engage mechanisms similar to those involved in visuospatial working memory and mental rotation. This suggests that reversing spoken items is a matter of mind twisting rather than tongue twisting and provides support for a link between language processing and manipulation of mental imagery.

Acoustic Stimulation↗

PubMed2005

Compensating strategies in collaborative remembering in very old couples.

This study investigates collaborative memory performance in very old married couples working in two types of participant constellations, and with two types of memory tasks, i.e. working as couples, or as individuals in episodic or semantic memory tasks. Sixty-two old married couples were a priori classified as high or low on two dimensions suggested to be important for successful collaboration, i.e. responsibility (how division of responsibility was organized) and agreement (how they mutually agreed on each other's view). The episodic memory task was immediate recall of short stories. The semantic memory tasks were to answer questions about names, places, and concepts. The results suggested that: (1) groups outperformed a single individual, but (2) groups in general suffered from collaboration relative to the predicted potential in episodic tasks only, thus replicating earlier results. Nevertheless, (3) the couples scoring high on division of responsibility achieved the same productivity as nominal pairs (i.e. the predicted potential); (4) the couples scoring high on the agreement dimension showed that they were not as affected by collaboration, but then performed less well in "absolute" performance. Finally, the results were discussed in terms of optimal compensation strategies, especially for elderly couples.

Aged↗

PubMed2004

Neural correlates of working memory for sign language.

Eight, early bilingual, sign language interpreters participated in a PET study, which compared working memory for Swedish Sign Language (SSL) with working memory for audiovisual Swedish speech. The interaction between language modality and memory task was manipulated in a within-subjects design. Overall, the results show a previously undocumented, language modality-specific working memory neural architecture for SSL, which relies on a network of bilateral temporal, bilateral parietal and left premotor activation. In addition, differential activation in the right cerebellum was found for the two language modalities. Similarities across language modality are found in Broca's area for all tasks and in the anterior left inferior frontal lobe for semantic retrieval. The bilateral parietal activation pattern for sign language bears similarity to neural activity during, e.g., nonverbal visuospatial tasks, and it is argued that this may reflect generation of a virtual spatial array. Aspects of the data suggesting an age of acquisition effect are also considered. Furthermore, it is discussed why the pattern of parietal activation cannot be explained by factors relating to perception, production or recoding of signs, or to task difficulty. The results are generally compatible with Wilson's [Psychon. Bull. Rev. 8 (2001) 44] account of working memory.

Adult↗

PubMed2003

Cognition in the hearing impaired and deaf as a bridge between signal and dialogue: a framework and a model.

This paper focuses on the role of cognition in visual language processing in the deaf and hard of hearing. Although there are modality-specific cognitive findings in the literature on comparisons across speech communication modes and language (sign and speech), there is an impressive bulk of evidence that supports the notion of general modality-free cognitive functions in speech and sign processing. A working-memory framework is proposed for the cognitive involvement in language understanding (sign and speech). On the basis of multiple sources of behavioural and neuroscience data, four important parameters for language understanding are described in some detail: quality and precision of phonology, long-term memory access speed, degree of explicit processing, and general processing and storage capacity. Their interaction forms an important parameter space, and general predictions and applications can be derived for both spoken and signed language conditions. The model is mathematically formulated at a general level, hypothetical ease-of-language-understanding (ELU) functions are presented, and similarities and differences from current working-memory and speech perception formulations are pointed out.

Cognition↗

PubMed2002

Exploring the perceived world of the deaf-blind: on the development of an instrument.

In the present interview study on a sample of 13 deaf-blind participants (eight Usher patients and five with other diagnoses), all but one with some remaining visual function and all but two with a pure-tone average (PTA) exceeding 100 dB HL, an instrument was developed to assess discovery and localization abilities (DILO), compensatory use of sensory information, emotional and cognitive aspects of communication, and the preferred use of technical aids. Both qualitative and quantitative data were collected, and it was found that (1) the importance of early discovery of events and persons is rated high, (2) vision ranks higher than other sensory information, and airflow, smell and residual hearing come next in the perceptual world of this sample, (3) cognitive aspects of communication correlate with the importance of discovery and localization, and (4) technical aids dominated by vision and vibratory senses are preferred. It is concluded that even a small remaining visual function could be of significant importance in rehabilitation. Finally, in the deaf-blind group of subjects with some remaining visual function, utilization of remaining vision was felt to be more important than utilization of other sensory modalities.

Acoustic Stimulation↗