Separate Cognitive Systems Research Articles

Persistent activity during working memory maintenance predicts long-term memory formation in the human hippocampus.

Working memory (WM) and long-term memory (LTM) are often viewed as separate cognitive systems. Little is known about how these systems interact when forming memories. We recorded single neurons in the human medial temporal lobe while patients maintained novel items in WM and completed a subsequent recognition memory test for the same items. In the hippocampus, but not in the amygdala, the level of WM content-selective persistent activity during WM maintenance was predictive of whether the item was later recognized with high confidence or forgotten. By contrast, visually evoked activity in the same cells was not predictive of LTM formation. During LTM retrieval, memory-selective neurons responded more strongly to familiar stimuli for which persistent activity was high while they were maintained in WM. Our study suggests that hippocampal persistent activity of the same cells supports both WM maintenance and LTM encoding, thereby revealing a common single-neuron component of these two memory systems.

Persistent activity during working memory maintenance predicts long-term memory formation in the human hippocampus.

Working Memory (WM) and Long-Term Memory (LTM) are often viewed as separate cognitive systems. Little is known about how these systems interact when forming memories. We recorded single neurons in the human medial temporal lobe while patients maintained novel items in WM and a subsequent recognition memory test for the same items. In the hippocampus but not the amygdala, the level of WM content-selective persist activity during WM maintenance was predictive of whether the item was later recognized with high confidence or forgotten. In contrast, visually evoked activity in the same cells was not predictive of LTM formation. During LTM retrieval, memory-selective neurons responded more strongly to familiar stimuli for which persistent activity was high while they were maintained in WM. Our study suggests that hippocampal persistent activity of the same cell supports both WM maintenance and LTM encoding, thereby revealing a common single-neuron component of these two memory systems.

Civility and Rejection: The Contextuality of Cosmopolitan and Racist Behaviours

Applying a dual-process framework to in-depth interviews and survey data, this article explores behavioural manifestations of intercultural attitudes for white majority Norwegians. The article builds upon established literatures on social cognition showing that humans operate with two separate cognitive systems. Affective ‘automatic’ heuristics often generate negative stereotypes, aversive emotions and behavioural responses to ethnic diversities. In contrast, the ‘discursive’ cognitive system, which stores cultural scripts, motivates predominantly egalitarian aspirations and performances. As people balance their behaviours according to contextual evaluations of costs and benefits, the article’s findings indicate a tendency to practise openness and civility in public and spatio-temporally bounded encounters, and to reject or exclude the Other in half or more of privately made selection decisions.

Chapter 4 - Developmental dyslexia: A new look at clinical features and brain mechanisms

Developmental dyslexia is the commonest "specific learning disorder" (DSM-5) or "developmental learning disorder with impairment in reading" (ICD-11). This impairment in reading acquisition is related to a defect in the installation of cognitive precursors necessary to master the grapheme-phoneme conversion. Its origin is largely genetic, but many environmental factors seem capable of modulating symptom intensity. Three types of presentation, roughly equal in occurrence, are useful to distinguish according to the associated disorders (language, attentional, and/or motor coordination), thus suggesting, at least in part, potentially different mechanisms at their origin. In adolescence and adulthood the clinical presentation tends to bear a more uniform pattern, covering a large range of severity depending on each person's ability to compensate for their deficit. Research has demonstrated dysfunction of specific brain areas during reading-related tasks (using fMRI), essentially in the left cerebral hemisphere, but also atypical patterns of connectivity (using diffusion imaging), further supplemented by functional connectivity studies at rest. The current therapeutic recommendations emphasize the need for multidisciplinary care, giving priority, depending on the clinical form, to the language, psychomotor, or neuropsychologic aspects of rehabilitation. Various training methods whose effectiveness has been scientifically tested are reviewed, emphasizing those exploiting the hypothesis of a lack of intermodal connectivity between separate cognitive systems.

Rational Versus Intuitive Processing

Abstract. This study explored two main theoretical propositions. First, we tested Hartmann’s (2011 , 2012 ) notion that video games are processed via two separate cognitive systems: System 1, the automatic system, and System 2, the rational system. Specifically, we used a cognitive load manipulation to test if intuitive moral responses such as guilt and anthropomorphism are processed in System 1. Second, we utilized moral foundations theory to test the effect of care salience on guilt and in-game aggression. Using an experimental design ( n = 94), the results indicate that under conditions of cognitive load, players had somewhat lower in-game aggression. Effects on guilt and anthropomorphism were in the same direction, albeit with small effects. In terms of moral foundations, we found that care salience was not negatively related to in-game aggression but was directly related to guilt, indicating that greater emphasis on the moral foundation of care resulted in greater guilt. Also, anthropomorphism was positively related to experienced guilt and negatively related to in-game aggression.

The Energy Landscape of Neurophysiological Activity Implicit in Brain Network Structure

A critical mystery in neuroscience lies in determining how anatomical structure impacts the complex functional dynamics of the brain. How does large-scale brain circuitry constrain states of neuronal activity and transitions between those states? We address these questions using a maximum entropy model of brain dynamics informed by white matter tractography. We demonstrate that the most probable brain states – characterized by minimal energy – display common activation profiles across brain areas: local spatially-contiguous sets of brain regions reminiscent of cognitive systems are co-activated frequently. The predicted activation rate of these systems is highly correlated with the observed activation rate measured in a separate resting state fMRI data set, validating the utility of the maximum entropy model in describing neurophysiological dynamics. This approach also offers a formal notion of the energy of activity within a system, and the energy of activity shared between systems. We observe that within- and between-system energies cleanly separate cognitive systems into distinct categories, optimized for differential contributions to integrated versus segregated function. These results support the notion that energetic and structural constraints circumscribe brain dynamics, offering insights into the roles that cognitive systems play in driving whole-brain activation patterns.

Aligning grammatical theories and language processing models.

We address two important questions about the relationship between theoretical linguistics and psycholinguistics. First, do grammatical theories and language processing models describe separate cognitive systems, or are they accounts of different aspects of the same system? We argue that most evidence is consistent with the one-system view. Second, how should we relate grammatical theories and language processing models to each other?

Familial Sinistrals Avoid Exact Numbers

We report data from an internet questionnaire of sixty number trivia. Participants were asked for the number of cups in their house, the number of cities they know and 58 other quantities. We compare the answers of familial sinistrals – individuals who are left-handed themselves or have a left-handed close blood-relative – with those of pure familial dextrals – right-handed individuals who reported only having right-handed close blood-relatives. We show that familial sinistrals use rounder numbers than pure familial dextrals in the survey responses. Round numbers in the decimal system are those that are multiples of powers of 10 or of half or a quarter of a power of 10. Roundness is a gradient concept, e.g. 100 is rounder than 50 or 200. We show that very round number like 100 and 1000 are used with 25% greater likelihood by familial sinistrals than by pure familial dextrals, while pure familial dextrals are more likely to use less round numbers such as 25, 60, and 200. We then use Sigurd’s (1988, Language in Society) index of the roundness of a number and report that familial sinistrals’ responses are significantly rounder on average than those of pure familial dextrals. To explain the difference, we propose that the cognitive effort of using exact numbers is greater for the familial sinistral group because their language and number systems tend to be more distributed over both hemispheres of the brain. Our data support the view that exact and approximate quantities are processed by two separate cognitive systems. Specifically, our behavioral data corroborates the view that the evolutionarily older, approximate number system is present in both hemispheres of the brain, while the exact number system tends to be localized in only one hemisphere.

Ostensive Cues Orient 10-Month-Olds’ Attention toward the Task But Delay Learning

The aim of this study is to investigate how ostensive cues modify infants’ visual attention to task demonstration, and the extent to which this enhances the performance in an imitative learning task. We hypothesized that ostensive cues would help orient infants’ attention toward relevant parts of the demonstration. We investigated the looking behavior of 41 10-month-old infants while observing an adult demonstrating a novel target action after having either provided ostensive cues or not. Infants’ looking behavior was measured using an eye tracker. Two areas of interest were analyzed: the targeted object and the adult’s face. Infants’ performance after demonstration was also analyzed. The results show that infants’ looking behavior varied across groups. When ostensive cues were not provided, infants looked mainly at the experimenter’s face. However, when ostensive cues were provided, infants oriented their attention toward the targeted object. These results suggest that ostensive cues help infants orient their attention toward task-relevant parts of the scene. Surprisingly, infants in the non-ostensive group improved their performance faster after demonstration than infants in the ostensive group. These results are discussed in terms of a video effect and dissociation between separate cognitive systems for social and non-social cognition.

Feedback interference and dissociations of classification: Evidence against the multiple-learning-systems hypothesis

Researchers have argued that different categorization problems are learned by separate and distinct cognitive systems. They propose that an explicit system is responsible for learning rule-based categories and that a separate implicit system learns information-integration categories. One source of supporting evidence involves experiments in which observers perform a concurrent memory-scanning task that interferes with the processing of feedback. Researchers have reported a dissociation in which this manipulation impairs learning of a rule-based category but not an information-integration category. In the present research, we test the hypothesis that the dissociation was the result of lowered perceptual discriminability in the rule-based structure in comparison with the information-integration one. We demonstrate an example of an alternate rule-based category with easy-to-discriminate stimuli in which performance is unaffected by the interfering memory-scanning task. Furthermore, we demonstrate that learning of an information-integration category with low perceptual discriminability is impaired by the memory-scanning task. These demonstrations of the reverse dissociation challenge the interpretation that rule-based and information-integration category structures are learned by separate cognitive systems.

Anomia and dyslexia in Chinese: A familiar story?

We report a study investigating the factors that predict the naming performance of four Chinese-speaking anomic patients. The results showed that the rated familiarity of an item predicts naming performance for all of the patients, a finding that is consistent with data from studies of English-speaking anomic patients. These data are discussed in terms of current models of spoken word production that have been developed largely on the basis of data from English speakers. We also investigated the relationship between anomia and dyslexia for each patient by presenting 232 items to name from pictorial input and from print. The results showed that there was a highly significant correlation between anomia and dyslexia for the same items among three of the four patients, a finding that is consistent with other studies of Chinese-speaking aphasic patients (e.g. Hu et al. 1983). However, for one patient there was a complete dissociation between naming and oral reading of the same items (impaired picture naming co-incident with flawless oral reading), suggesting that spoken word production and oral reading can proceed via separate cognitive systems. We offer a model of spoken word production and oral reading in Chinese that assumes picture naming and oral reading rely upon functionally separate pathways to account for these data.

A Developmental Investigation of Standard and Nonstandard English among Black and White Children

Data are reported and interpreted involving language imitation, comprehension, and free production of two English dialects. The major subgroupings of 360 subjects involved two races (black and white), sex, socioeconomic level (low SES and middle SES), and age (5, 8, and 10 years). Rate of improvement measures indicated that blacks improve at the same rate as whites in responding to standard English sentences. According to correlational results, the two dialect systems function behaviorally as separate cognitive systems. In a communication task, blacks and whites produce and comprehend messages of about the same quality