Abstract
This paper explores how mental disorders of certain types might be explained based on mechanisms and processes of human motivation (including drives and goals) and action selection (as well as other related mechanisms and processes), within a generic, comprehensive computational cognitive architecture model. It is hypothesized that such mechanisms may capture the relative invariance within an individual in terms of behavioral inclinations (at different times and with regard to different situations, as well as the necessary variability of behaviors). The hypothesis results from the computational cognitive architecture CLARION. Several simulation tests have been conducted that demonstrate that the model is reasonable and captures some characteristics of certain mental disorders (such as certain types of addiction and obsessive-compulsive disorder). The work is a first step in showing the feasibility of integrating mental disorders modeling/simulation into a generic cognitive model (i.e., a cognitive architecture).
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Notes
Note that the selection probabilities may be variable, determined through a psychological process known as “probability matching”, that is, the probability of selecting a component is determined based on the relative success ratio of that component.
Note that a generalized notion of “drive” is adopted here, different from the stricter interpretations of drives (e.g., as physiological deficits that require to be reduced by corresponding behaviors; Hull, 1951). In our sense, drives denote internally felt needs of all kinds that likely may lead to corresponding behaviors, regardless of whether the needs are physiological or not, whether the needs may be reduced by the corresponding behaviors or not, or whether the needs are for end states or for processes. Therefore, it is a generalized notion that transcends controversies surrounding the stricter notions of drive.
Note that, in terms of the gain s parameter, averaging of the two gain s parameters may be used to handle those drives that are in both BIS and BAS.
Note that drive strengths actually could be a function of the above equation; in the simplest case, an identity function may be assumed, as shown above.
The deficit of a drive was “decayed” at each step using a multiplicative factor (decay d = 10%), when the agent was actively addressing the drive (i.e., when the agent’s goal corresponded to the drive). See Appendix for more discussions of this issue. The "decay" of the deficit of the corresponding drive was just a simplification for the sake of this particular simulation (decay of the deficit of the drive occurred only if the input state remained the same for this simulation).
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Acknowledgments
This work has been supported in part by the ARI grant W74V8H-05-K-0002 (to Ron Sun and Bob Mathews) and the ONR grant N00014-08-1-0068 (to Ron Sun). Thanks are due to Larry Reid and Paul Bello for their comments.
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Appendix
Appendix
Change of Drive Deficits
In general, we need a mechanism (i.e., the “deficit change module”, as discussed before) for reducing/increasing the deficit related to a drive that is affected by the current action under the current goal. The reduction/increase in deficits is outside the current specification of the MS in CLARION. This is because their causes are complex and varied; it may be physiologically determined sometimes (e.g., for “food deficit” usually), but may also be psychologically determined in a complex way some other times (e.g., for “dominance and power deficit”).
For instance, in a simplified simulation, one “winning” drive that gets to set the “winning” goal, will be impacted by subsequent actions; it may be gradually reduced. But in general, multiple drives may contribute to setting the “winning” goal (see the technical details in [26, 29]), and many of them may be impacted, if the actions performed lead to reducing (or increasing) the deficits related to these drives. (For example, eating solid food might lead to reducing both the food deficit as well as the water deficit.). Even other drives that did not contribute to setting the “winning” goal may also be impacted in some fashion, if the actions performed lead to reducing or increasing the deficits related to these drives.
Determining Avoidance Versus Approach Drives, Goals, and Behaviors
To decide whether a drive belongs to BIS or BAS, the following principles have been hypothesized:
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This determination is based on seeking positive rewards versus avoiding punishments (i.e., negative rewards).
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This determination does not involve complex reasoning, mental simulation, and so on because the processes of drives are reflexive and immediate [25].
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Some drives come with intrinsic positive rewards (e.g., food, reproduction, fairness/vengeance, dominance, affiliation, achievement—essentially all the drives in the BAS), while others do not have related intrinsic positive reward (e.g., sleeping, avoiding danger, avoiding the unpleasant; so, mostly, they are for avoiding negative rewards).
Based on the above, we can justify one by one why each drive should be in BAS, BIS, or both (details omitted). See Table 2 for the result of this determination.
To determine whether a goal is approach or avoidance oriented, we base the decision on its associations to approach or avoidance drives. Specifically, we sum the strengths of a goal (as determined by the goal strength equation of CLARION) taken over all of the scenarios for approach and avoidance drives, respectively. If the sum of strengths for a given goal is higher when coupled with approach drives than with avoidance drives, then, it is an approach goal. If the sum of strengths for a given goal is higher when coupled with avoidance drives than with approach drives, then, it is an avoidance goal.
We define behaviors as being either approach or avoidance oriented, based upon associations with approach or avoidance goals. We accomplish this by summing the values of each behavior (as determined by the trained bottom level of the ACS of CLARION) taken over all of the scenarios for approach and avoidance goals, respectively. If the sum of values for a given behavior is higher when coupled with approach goals than with avoidance goals, then the behavior is an approach behavior. If the sum of values for a given behavior is higher when coupled with avoidance goals than with approach goals, then the behavior is an avoidance behavior.
Some Additional Data Used in the Simulations
Some additional data used in the simulations can be seen below in Tables 17, 18, 19, 20. See also [32] for other related details and justifications.
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Sun, R., Wilson, N. & Mathews, R. Accounting for Certain Mental Disorders Within a Comprehensive Cognitive Architecture. Cogn Comput 3, 341–359 (2011). https://doi.org/10.1007/s12559-011-9099-y
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DOI: https://doi.org/10.1007/s12559-011-9099-y