Damasio, A.R., 1989. Time-locked multiregional retroactivation: a systems -level proposal for the neural substrates of recall and recognition. Cognition 33, 25-- 62.  Home/Search   Document Not in Database   Summary   Related Articles   Check

.... the brain region which most firmly associated with encoding in neuropsychological studies [29] It has been suggested that the hippocampus is crucial to memory formation; and has an important role in binding together neuronally distributed events that happen at the time of perception and encoding [6,29,20]. However two issues complicate a sim ple interpretation of the hippomcapal activation that we have observed in this study. First, the process of data analysis of PET rCBF images applies a smoothing filter to the raw data, in an effort to improve the signal to noise characteristics of the images ....

Damasio, A.R., Time-locked multiregional retroactivation: a systems -level proposal for the neural substrates of recall and recognition, Cognition, 33 (1989) 25-62.

....between category information and exemplar information. Roschs work on the basic object level marked basic level category knowledge as special, and distinct, from exemplar level knowledge [1] The work of Damasio further suggests that this distinction is physical as well as functional [2]. Furthermore, recent theorising on the nature of categories has highlighted the need for dynamic forms of representation to capture the flexibility inherent in human categorisation [3] Our model uses a integrated approach, in which category knowledge is an emergent property of the representation ....

Damasio, A.R.: Time-locked multiregional retroactivation: A systems-level proposal for the neural substrates of recall and recognition. Cognition. 33 (1989) 25-62

....than an amodal redescription of the perceptual event representing the bird, a perceptual simulation of previous experience represents it instead. Increasing empirical evidence from both the cognitive and the neuroscience literatures implicates perceptual simulations in conceptual processing (e.g. Damasio, 1989; Gainotti, Silveri, Daniele, Giustolisi, 1995; Glenberg, 1997; Glenberg Robertson, 2000; Humphreys Forde, in press; Pulvermller, 1999; Martin, Ungerleider, Haxby, 2000; Solomon Barsalou, 2000, in press; Stanfield Zwaan, in press; Warrington Shallice, 1984) For some time, analogous ....

Damasio, A.R. (1989). Time-locked multiregional retroactivation: A systems-level proposal for the neural substrates of recall and recognition. Cognition, 33, 25-62.

....of single mode sensor representations of concepts in the same neural architecture, connecting the di#erent implementations of the concept hierarchy at all levels and in a consistent fashion. This mathematical model appears to be compatible with a model of the primate brain proposed by Damasio[1]. We hope that others will find this model interesting and useful for neural network analysis and design. ....

A. Damasio. Time-locked multiregional retroactivation: A systems-level proposal for the neural substrates of recall and recognition. Cognition, 33:25--62, 1989.

....encoding of a predicate. All rules and facts that involve a predicate converge on its cluster, and all rules and facts involving a predicate can be accessed by fanning out from the predicate s cluster. This representation of a predicate is closely related to the notion of convergence zones (Damasio, 1989). Let us examine the semantic import of the enabler and collector nodes. Assume that the roles of a predicate P are dynamically bound to some fillers thereby representing a dynamic instance of P (we will see how, shortly) The concomitant activation of the enabler e:P means that the system 0 ....

Damasio, A. R. (1989) Time-locked multiregional retroactivation: A systems-level proposal for the neural substrates of recall and recognition. Cognition, 33, 25-62.

....higher uni modal associative area. The higher, more central areas, A 1 and A 2 , were bi directionally connected with a further associative structure, supposedly the hippocampus H (more generally, this could also be a higher cortical association area, maybe a convergence zone in the sense of Damasio, 1989). The model structure of the individual sub networks A 1 ; A 2 and H was virtually the same than that considered in earlier sections. External inputs to the sensory streams were static, simple geometrical linefigures for the visual and abstractions of tones or frequency combinations for the ....

....1 and A 2 and the global contextual information is stored in the cortico hippocampal loop. 4. 2 Associative Brain Models Several brain theories based on assembly or associative memory models as outlined above have been devised (Hebb, 1949; Braitenberg, 1978; Wickelgren, 1981, 1992; Palm, 1982; Damasio, 1989; McGregor, 1993; and more) Interestingly within such general frameworks the question whether persistent assemblies are supported in the brain by stochastic or correlated activity has also been discussed early (e.g. Hebb, 1949; Eccles, 1958) McGregor (1993) called the two alternatives ....

Damasio, A.R. (1989) Time-locked multiregional retroactivation: A systems-level proposal for the neural substrates of recall and recognition. Cognition, 33, 25-62.

....of a new object, an operation one may refer to as triangular binding. Composite objects can engage in further composition, thus giving rise to arbitrarily deep tree structured constructs. Physiological evidence of triangular binding in the visual system can be found in Sillito et al. 1994) Damasio (1989) describes an approach derived from neuroanatomical data and lesion studies that is largely consistent with the formalism described here. An important requirement for the neural representation of the tree structured objects used in our model is that the doing and undoing of links operating on some ....

Damasio, A. R. (1989) Time-locked multiregional retroactivation: a systems-level proposal for the neural substrates of recall and recognition, Cognition, 33:25--62.

....existence of feedback connections tuning the activity of F1 neurons such that they become more responsive to the presence of a target occuring anywhere in the visual field. This proposal fits well with previous hypotheses concerning the role of feedback connections (Ullman, 1991; Mumford, 1992; Damasio, 1989, 1990; Rolls, 1990; Finkel and Edelman, 1989; Tononi, Sporn and Edelman, 1992; Rockland, 1994) As stated for instance by Damasio (1989) these reciprocal connections may support a kind of locking (through synchronization) between behavioral expectancies and early perception. However, most of these ....

Damasio, A. R. (1990). Time-locked multiregional retroactivation: A systems-level proposal for the neural substrates of recall and recognition. In Eimas, P. D. and Galaburda, A. M. (Eds.), Neurobiology of Cognition (pp. 25-62). Cambridge, MA: The MIT Press.

....Compositionality 8 short, composite patterns will be constructed by suitably arranging constituent activities, thereby providing an explicit representation of parts and their relations. Productivity will then arise, fundamentally, from combinatorics in a space of neural activity patterns; see Damasio (1989) for a similar picture based on neuroanatomical data and lesion studies. Most compositional models to date follow a suggestion of von der Malsburg (1987) and use fine temporal structure of neural activity as the medium for expressing dynamical binding. One currently popular implementation of this ....

Damasio, A. R. (1989) Time-locked multiregional retroactivation: a systems-level proposal for the neural substrates of recall and recognition, Cognition, 33:25--62.

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Damasio, A.R., 1989. Time-locked multiregional retroactivation: a systems -level proposal for the neural substrates of recall and recognition. Cognition 33, 25-- 62.

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Damasio, A. R. (1989b). Time-locked multiregional retroactivation: A systems-level proposal for the neural substrates of recall and recognition.

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Damasio, A. R. 1989b. Time-locked multiregional retroactivation: A systems-level proposal for the neural substrates of recall and recognition. Cognition 33:25#62.

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Damasio, A. R. 1989b. Time-locked multiregional retroactivation: A systems-level proposal for the neural substrates of recall and recognition. Cognition 33:25--62.

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Damasio, A. R. (1989b). Time-locked multiregional retroactivation: A systems-level proposal for the neural substrates of recall and recognition. Cognition, 33:25--62.

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A. R. Damasio. Time-locked multiregional retroactivation: A systems-level proposal for the neural substrates of recall and recognition. Cognition, 33: 25--62, 1989.

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Damasio, A. R. (1989b). Time-locked multiregional retroactivation: A systems-level proposal for the neural substrates of recall and recognition. Cognition, 33:25--62.

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