Episodic and semantic memory in accounts of food intolerance

It was hypothesized that accounts of occasions of eating followed by adverse symptoms (i.e. perceived food intolerance) would contain greater detail when based on recall of actual events, using episodic memory. Where accounts lacked detail it was hypothesized that recalled events were based on knowledge about food intolerance, without personal experience of a plausible incident. These hypotheses were tested by categorizing the contents of interviews of respondents to a randomized survey of the electorate in the Birmingham area, who attributed one or more adverse symptoms to one or more foods. The majority of interview records provided evidence for semantic memory rather than recall of actual episodes of food ingestion followed by symptoms(s). Vagueness of recollection correlated negatively with patho‐physiological plausibility of the perceived food intolerance. Greater detail and specificity in accounts of food‐symptom episodes was positively correlated with plausibility. Rareness of food‐symptom(s) contingencies also correlated with detail and specificity in accounts of episodes and with plausibility of food intolerance. Detail and specificity of accounts of the eating of foods followed by symptoms, when coupled with rareness of the contingency of that food being followed by those symptoms, may prove to be a better predictor of physically diagnosed food intolerance than plausibility by patho‐physiological criteria alone. Copyright © 1999 John Wiley & Sons, Ltd.     

Yours or mine? Ownership and memory

An important function of the self is to identify external objects that are potentially personally relevant. We suggest that such objects may be identified through mere ownership. Extant research suggests that encoding information in a self-relevant context enhances memory (the so-called 'self-reference effect'), thus an experiment was designed to test the impact of ownership on memory performance. Participants either moved or observed the movement of picture cards into two baskets; one of which belonged to self and one which belonged to another participant. A subsequent recognition test revealed that there was a significant memory advantage for objects that were owned by self. Acting on items (i.e., moving them) had no impact on memory. Results are discussed with reference to the importance of self-object associations in cognition.     

Emergence and Causal Powers

This paper argues that the non-reductive monist need not be concerned about the ‘problem’ of mental causation; one can accept both the irreducibility of mental properties to physical properties and the causal closure of the physical. More precisely, it is argued that instances of mental properties can be causally efficacious, and that there is no special barrier to seeing mental properties whose instances are causally efficacious as being causally relevant to the effects they help to bring about. It is then shown that the causal relevance of mental properties is consistent with there being no downward causation, so the dilemma of ‘epiphenomenalism or reduction’ can be avoided. Non-reductive monism lives on as a viable position in the philosophy of mind.

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A rate measure of the relative aversiveness of signalled vs unsignalled shock

Five rats were trained on a two-component multiple schedule with each component consisting of a two-link chain schedule. Differential response suppression in the initial links of the chain schedules was used as a measure of the relative aversiveness of events introduced into the subsequent terminal links. When unsignalled shock was scheduled in one terminal link and signalled shock in the other (in addition to equal numbers of food reinforcers), responding was suppressed to a greater degree in the initial link preceding the unsignalled-shock condition. Reversing the terminal-link positions of unsignalled shock and signalled shock led to a reversal of the differential response suppression in the initial links. These results confirm previous findings that signalled shock is less aversive than unsignalled shock and extend the generality of this phenomenon from choice measures to rate measures of aversiveness.     

The relative aversiveness of signalled versus unsignalled shock-punishment

Six rats were trained on a two-component multiple schedule with each component consisting of a two-link chain schedule. Differential response suppression in the two initial links, as well as in the two terminal links of the chain schedules, was used as a measure of the relative aversiveness of stimulus events in the two terminal links. When signalled and unsignalled shock-punishment (in addition to equal numbers of food reinforcers) were scheduled in the separate terminal links, subjects responded at lower rates in the initial link preceding unsignalled shock-punishment than in the initial link preceding signalled shock-punishment. Similarly, subjects responded at lower rates in the terminal link containing unsignalled shock-punishment than in the terminal link containing signalled shock-punishment. Reversing the terminal-link positions of signalled and unsignalled shock-punishment led to a reversal of the differential response suppression in the two initial and the two terminal links of the chain schedules. These results indicate that signalled punishment is relatively less aversive than unsignalled punishment and support an “information hypothesis”, which assumes that a condition in which information is provided about the onset of environmental events, even negative events such as shock punishment, is more reinforcing than a condition in which such information is absent.