Talking while looking: On the encapsulation of output system representations

The idea that the human mind can be divided into distinct (but interacting) functional modules is an important presupposition in many theories of cognition. While previous research on modularity predominantly studied input domains (e.g., vision) or central processes, the present study focused on cognitive representations of output domains. Specifically, we asked to what extent output domain representations are encapsulated (i.e., immune to influence from other domains, representing a key feature of modularity) by studying determinants of interference between simultaneous action demands (oculomotor and vocal responses). To examine the degree of encapsulation, we compared single- vs. dual-response performance triggered by single stimuli. Experiment 1 addressed the role of stimulus modality under dimensionally overlapping response requirements (stimuli and responses were spatial and compatible throughout). In Experiment 2, we manipulated the presence of dimensional overlap across responses. Substantial performance costs associated with dual-response (vs. single-response) demands were observed across response modalities, conditions, and experiments. Dimensional overlap combined with shared spatial codes across responses enabled response-code priming (i.e., beneficial crosstalk between output domains). Overall, the results are at odds with the idea of strong encapsulation of output system representations and show how processing content determines the extent of interdependency between output domains in cognition.     

Trauma is not the whole story: Trajectories of responses to childhood disasters intertwining with Life following the Indian Ocean tsunami

In an era of global threats, understanding the implications of disasters on young people's life course is of central importance. A particular emphasis should be placed on non-Western economically developing societies that are considered as vulnerable and are less studied, and on social groups within these societies that are underrepresented. The present study focuses on young Sri Lankan women who experienced the 2004 Indian Ocean tsunami as children. Thirteen young women generated their life stories in semi-structured interviews, 12 years after the disaster had elapsed. Holistic narrative analysis revealed new variations and in-depth meanings in disaster response trajectories and presented the intertwining courses of the responses to the Potentially Traumatic Event (PTE) with ecological aspects throughout development, as in Trajectories intertwining with Life (TiL). This study provides empirical, methodological, conceptual and practical innovations to the study of human development throughout the life course, within the interdisciplinary fields of trauma and disasters.

Highlights

• This research is interested in how childhood disaster response trajectories among an understudied population are understood through an ecological-developmental perspective.
• Life stories uncover Trajectories intertwining with Life (TiL) among Sri Lankan women who were children during the Indian Ocean tsunami.
• The TiL unique outcomes, integrating trauma responses as inseparable from ecological and developmental aspects, offer various theoretical and applied implications.

     

Using neural response properties to draw the distinction between modal and amodal representations

ABSTRACT

Barsalou has recently argued against the strategy of identifying amodal neural representations by using their cross-modal responses (i.e., their responses to stimuli from different modalities). I agree that there are indeed modal structures that satisfy this “cross-modal response” criterion (CM), such as distributed and conjunctive modal representations. However, I argue that we can distinguish between modal and amodal structures by looking into differences in their cross-modal responses. A component of a distributed cell assembly can be considered unimodal because its responses to stimuli from a given modality are stable, whereas its responses to stimuli from any other modality are not (i.e., these are lost within a short time, plausibly as a result of cell assembly dynamics). In turn, conjunctive modal representations, such as superior colliculus cells in charge of sensory integration, are multimodal because they have a stable response to stimuli from different modalities. Finally, some prefrontal cells constitute amodal representations because they exhibit what has been called ‘adaptive coding’. This implies that their responses to stimuli from any given modality can be lost when the context and task conditions are modified. We cannot assign them a modality because they have no stable relation with any input type.

Abbreviatons: CM: cross-modal response criterion; CCR: conjuntive cross-modal representations; fMRI: functional magnetic resonance imaging; MVPA: multivariate pattern analysis; pre-SMA: pre-supplementary motor area; PFC: prefrontal cortex; SC: superior colliculus; GWS: global workspace