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- Harald Atmanspacher, The Significance of Causally Coupled, Stable Neuronal Assemblies for the Psychological Time Arrow.Stable neuronal assemblies are generally regarded as neural correlates of mental representations. Their temporal sequence corresponds to the experience of a direction of time, sometimes called the psychological time arrow. We show that the stability of particular, biophysically motivated models of neuronal assemblies, called coupled map lattices, is supported by causal interactions among neurons and obstructed by non-causal or anti-causal interactions among neurons. This surprising relation between causality and stability suggests that those neuronal assemblies that are stable due to causal neuronal interactions, and thus correlated with mental representations, generate a psychological time arrow. Yet this impact of causal interactions among neurons on the directed sequence of mental representations does not rule out the possibility of mentally less efficacious non-causal or anti-causal interactions among neurons.In my reading list | Discuss this article | Edit | Categorize |My bibliography
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We have performed a set of experiments that correlate EEG spectral parameters with cognitive functions. The tasks (visual perception, supramodal object recognition, short-term memory) were chosen so that the cortical area involved extended over different length scales. The extent of the cognitive neuronal assemblies correlated inversely with the frequency where EEG synchronization was found. This provides a further relation between experiment and the theory put forward in the Nunez target article.
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| Discuss this article | Edit | Categorize | My bibliography | Export citation | Other links: dare.ubn.kun.nl dare.ubn.kun.nl:8080 ncbi.nlm.nih.gov ingentaconnect.com | Scholar | More..
| | Other links: dare.ubn.kun.nl dare.ubn.kun.nl:8080 ncbi.nlm.nih.gov ingentaconnect.com | Scholar | More.. In [Sch05a], it is argued that Boltzmann's intuition, that the psychological arrow of time is necessarily aligned with the thermodynamic arrow, is correct. Schulman gives an explicit physical mechanism for this connection, based on the brain being representable as a computer, together with certain thermodynamic properties of computational processes. [Haw94] presents similar, if briefer, arguments. The purpose of this paper is to critically examine the support for the link between thermodynamics and an arrow of time for computers. The principal arguments (...)
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Pulvermüller's discussion needs more explanation of how the proposed assemblies remain assembled after formation and how they can be accessed later among all the possible assemblies, many of which involve many of the same neurons. Alternative Hebbian strengthening mechanisms may provide additional information, and, developmental studies of the assemblies might provide insights into their evolution.
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