Initiating the formalization of theories of cognitive aging.

Although the relevant knowledge base is still impoverished, the time may be appropriate to attempt to develop and investigate formal models of cognitive aging that incorporate explicit mechanisms to account for age differences frequently observed in measures of cognitive functioning. An initial model based on an associative network metaphor is described, in which age declines in fluid or process aspects of cognition are attributed to a reduction in either the number of simultaneously active nodes, the maximum allowable activation, or the rate of propagating activation between nodes. Results from a computer simulation are consistent at a first level of approximation with many cognitive aging phenomena, and the model is shown to provide a plausible account of age differences in an area that has previously resisted explanation. Although this particular model is only one of many that could be formulated at the present time, it is argued that more rapid progress in theoretical understanding of cognitive aging phenomena will be achieved by attempting to specify one's assumptions and hypotheses in a formal and explicit manner.

[1]  James L. McClelland,et al.  An interactive activation model of context effects in letter perception: Part 2. The contextual enhancement effect and some tests and extensions of the model. , 1982, Psychological review.

[2]  D. Madden.  Adult age differences in visual word recognition: semantic encoding and episodic retention. , 1986, Experimental aging research.

[3]  S. Kaplan.  The Physiology of Thought , 1950 .

[4]  R. Cattell,et al.  Age differences in primary mental ability factors. , 1966, Journal of gerontology.

[5]  Timothy A. Salthouse,et al.  Sources of Age-Related Individual Differences in Block Design Tests. , 1987 .

[6]  Timothy A. Salthouse,et al.  The Role of Processing Resources in Cognitive Aging , 1988 .

[7]  D. Burke,et al.  Semantic priming in young and older adults: evidence for age constancy in automatic and attentional processes. , 1987, Journal of experimental psychology. Human perception and performance.

[8]  D. O. Hebb,et al.  The effect of early and late brain injury upon test scores, and the nature of adult intelligence. , 1942 .

[9]  J. Cerella,et al.  Lexical Access and Age. , 1984 .

[10]  N. C. Waugh,et al.  Age-related differences in naming latency. , 1977, The American journal of psychology.

[11]  N. L. Bowles,et al.  The effect of age on speed of lexical access. , 1981, Experimental aging research.

[12]  Gary S. Dell,et al.  Positive Feedback in Hierarchical Connectionist Models: Applications to Language Production , 1988, Cogn. Sci..

[13]  B. Fairbank.  The Use of Presnloothing and Postsnloothing to Increase the Precision of Equipercentile Equating , 1987 .

[14]  D. Madden.  Age differences and similarities in the improvement of controlled search. , 1982, Experimental aging research.

[15]  D. Howard.  The effects of aging and degree of association on the semantic priming of lexical decisions. , 1983, Experimental aging research.

[16]  E. Lovelace,et al.  Free associations of older adults to single words and conceptually related word triads. , 1982, Journal of gerontology.

[17]  J. T. Puglisi.  Semantic encoding in older adults as evidenced by release from proactive inhibition. , 1980, Journal of gerontology.

[18]  T. Salthouse,et al.  Adult age differences in integrative spatial ability. , 1987, Psychology and aging.

[19]  T. Hess,et al.  Specific exemplar retention and prototype abstraction in young and old adults. , 1986, Psychology and aging.

[20]  James L. McClelland,et al.  An interactive activation model of context effects in letter perception: I. An account of basic findings. , 1981 .

[21]  James L. McClelland,et al.  Parallel distributed processing: explorations in the microstructure of cognition, vol. 1: foundations , 1986 .

[22]  Daniel Sabbah.  Computing with connections in visual recognition of origami objects , 1985 .

[23]  Jerome A. Feldman,et al.  Connectionist Models and Their Properties , 1982, Cogn. Sci..

[24]  T. Salthouse,et al.  Skilled performance: Effects of adult age and experience on elementary processes. , 1982 .

[25]  Horn Jl.  Psychometric studies of aging and intelligence. , 1975 .

[26]  D. Burke,et al.  Word associations in old age: evidence for consistency in semantic encoding during adulthood. , 1986, Psychology and aging.

[27]  Adult age differences in accessing and retrieving information from long-term memory. , 1983, Journal of gerontology.

[28]  T. Salthouse,et al.  Effects of aging on perceptual closure. , 1988, The American journal of psychology.

[29]  C. Spearman.  The nature of "intelligence" and the principles of cognition , 1926 .

[30]  D. Howard,et al.  Category norms: a comparison of the Battig and Montague (1969) norms with the responses of adults between the ages of 20 and 80. , 1980, Journal of gerontology.

[31]  Intelligence—Why It Grows, Why it declines , 1967 .

[32]  P. Baltes,et al.  Life-Span Developmental Psychology: Research and Theory , 1970 .

[33]  T. Salthouse.  The role of representations in age differences in analogical reasoning. , 1987, Psychology and aging.

[34]  Age and access time for different memory codes. , 1980, Experimental aging research.

[35]  Geoffrey E. Hinton,et al.  Parallel Models of Associative Memory , 1989 .

[36]  M. Byrd,et al.  Age differences in the retrieval of information from semantic memory. , 1984, Experimental aging research.

[37]  J. L. Mistler-Lachman.  Spontaneous.shift in encoding dimensions among elderly subjects. , 1977, Journal of gerontology.

[38]  C. Chiarello,et al.  Automatic and controlled semantic priming: accuracy, response bias, and aging. , 1985, Journal of gerontology.

[39]  Gary S. Dell,et al.  Positive Feedback in Hierarchical Connectionist Models: Applications to Language Production , 1988, Cogn. Sci..

[40]  James L. McClelland,et al.  An interactive activation model of context effects in letter perception: part 1.: an account of basic findings , 1988 .

[41]  M. McAndrews,et al.  Semantic priming of lexical decisions in young and old adults. , 1981, Journal of gerontology.

[42]  N. L. Bowles,et al.  Aging and retrieval of words in semantic memory. , 1985, Journal of gerontology.

[43]  L W Poon,et al.  Age and word frequency effects in continuous recognition memory. , 1980, Journal of gerontology.

[44]  T A Salthouse,et al.  Inferences about age impairments in inferential reasoning. , 1987, Psychology and aging.

[45]  James L. McClelland,et al.  Distributed memory and the representation of general and specific information. , 1985, Journal of experimental psychology. General.

[46]  W. Danziger,et al.  Age and the perception of incomplete figures. , 1978, Experimental aging research.

[47]  R. Cattell.  Theory of fluid and crystallized intelligence: A critical experiment. , 1963 .

[48]  H. E. Jones,et al.  The growth and decline of intelligence: a study of a homogeneous group between the ages of ten and sixty. , 1933 .

[49]  T. Salthouse.  A Theory of Cognitive Aging , 1985 .

[50]  Mark L. Howe,et al.  Cognitive Development in Adulthood , 1988 .

[51]  G. Stricker,et al.  Handbook of Developmental Psychology , 1982 .

[52]  C. Elias,et al.  Age and semantic and phonological encoding. , 1976 .

[53]  Donald H. Kausler,et al.  Reaction time as a function of age, anxiety, and typicality , 1980 .

[54]  L L Light,et al.  Memory for scripts in young and older adults , 1983, Memory & cognition.

[55]  O. G. Selfridge,et al.  Pandemonium: a paradigm for learning , 1988 .

[56]  P. Yee,et al.  Semantic Priming during Sentence Processing by Young and Older Adults. , 1984 .

[57]  J. Horn.  CHAPTER 16 – Organization of Data on Life-Span Development of Human Abilities , 1970 .

[58]  Jordan B. Pollack,et al.  Massively Parallel Parsing: A Strongly Interactive Model of Natural Language Interpretation , 1988, Cogn. Sci..

[59]  Age differences in the commonality of free associations. , 1986, Experimental aging research.

[60]  M. McAndrews,et al.  Semantic activation during memory encoding across the adult life span. , 1980, Journal of gerontology.

[61]  Donald A. Norman,et al.  Simulating a Skilled Typist: A Study of Skilled Cognitive-Motor Performance , 1982, Cogn. Sci..

[62]  M. Eysenck.  Retrieval from semantic memory as a function of age. , 1975, Journal of gerontology.

[63]  Raymond J. Shaw,et al.  Aging and the time course of semantic activation. , 1986, Journal of gerontology.