Reasoning with conditionals

This paper reviews the psychological investigation of reasoning with conditionals, putting an emphasis on recent work. In the first part, a few methodological remarks are presented. In the second part, the main theories of deductive reasoning (mental rules, mental models, and the probabilistic approach) are considered in turn; their content is summarised and the semantics they assume for if and the way they explain formal conditional reasoning are discussed, in particular in the light of experimental work on the probability of conditionals. The last part presents the recent shift of interest towards the study of conditional reasoning in context, that is, with large knowledge bases and uncertain premises.     

How our brains reason logically

The aim of this article is to strengthen links between cognitive brain research and formal logic. The work covers three fundamental sorts of logical inferences: reasoning in the propositional calculus, i.e. inferences with the conditional “if...then”, reasoning in the predicate calculus, i.e. inferences based on quantifiers such as “all”, “some”, “none”, and reasoning with n-place relations. Studies with brain-damaged patients and neuroimaging experiments indicate that such logical inferences are implemented in overlapping but different bilateral cortical networks, including parts of the fronto-temporal cortex, the posterior parietal cortex, and the visual cortices. I argue that these findings show that we do not use a single deterministic strategy for solving logical reasoning problems. This account resolves many disputes about how humans reason logically and why we sometimes deviate from the norms of formal logic.

Visual field x response hand interactions and level priming in the processing of laterally presented hierarchical stimuli

Hemisphere-specific processing of laterally presented global and local stimulus levels was investigated by (a) examining interactions between the visual field of stimulus presentation and the response hand and (b) comparing intra- with inter-hemispheric effects of level priming (i.e. faster and more accurate performance when the target level repeats). Although in Experiment 1, which involved two-choice responses with left and right hands, performance costs occurred when the same hemisphere received the stimulus and controlled the response hand, further analyses suggest that these effects reflect spatial compatibility rather than intra-hemispheric interference. Consistent with the spatial compatibility interpretation, in Experiment 2 a similar visual field x response interaction was obtained with regard to left and right responses given with the same hand. Trial-to-trial level priming occurred in both experiments and was unaffected by the intra-hemispheric sequence of target levels. Implications regarding hemispheric processing mode are discussed.     

The generation and maintenance of visual mental images: evidence from image type and aging

Imagery is a multi-componential process involving different mental operations. This paper addresses whether separate processes underlie the generation, maintenance and transformation of mental images or whether these cognitive processes rely on the same mental functions. We also examine the influence of age on these mental operations for independence of components. In Experiment 1, younger (22 years) and older (69 years) adults generated and maintained general, specific, contextual and autobiographical visual mental images evoked in response to concrete nouns. The older adults had longer generation times, but there was no difference between the two groups on maintenance. Both groups had shortest generation and maintenance times for general images, whereas only the older adults took longest in generating autobiographical images. In Experiment 2, the total maintenance time and number of transformations for each type of image were compared in another group of younger and older adults. General images were less transformed and more subject to decay for both groups. The older people maintained the autobiographical mental images for longest compared to other image types. In conclusion, image generation, maintenance and transformation seem to be differently affected by type of image and aging, supporting a model of their cognitive segregation.     

Children's left parietal brain activation during mental rotation is reliable as well as specific

Some recent evidence suggests that mental rotation of characters in children aged 7 or 8 years might be lateralized to the left parietal hemisphere. An alternative statement exists, however, the finding might be completely unspecific for mental rotation but either be simply a function of task difficulty or a consequence of the use of characters as stimuli. To test these alternatives, ERPs of 24 second graders were measured twice: (a) during mental rotation with characters as stimuli and orientations of 30°, 90°, or 150° and (b) during memory scanning with characters as stimuli and set sizes of 1, 2, or 3 letters. In both cases, an amplitude modulation was found. The effect of mental rotation as a function of character orientation turned out to be lateralized to the left parietal hemisphere. The effect of memory scanning as a function of set size, however, turned out to be completely non-lateralized. Thus, children's left hemisphere activation during mental rotation is reliable as well as specific.     

Coventry university students’ experience of mental health problems

Growing numbers of university students are reporting mental health problems and using counselling services. The purpose of this study was to examine Coventry University students’ experience of mental health problems. The Department of Health (DoH) Mental Health Survey questionnaire (2003) was used to examine the experience of mental health problems and help seeking behaviour. Within the last 12 months nearly three quarters of students had experienced anxious or depressed moods, or, personal, mental, nervous or emotional problems, with a third of students failing to seek help. Ethnic minority students were more likely to report problems and less likely to seek help when compared to white students. Male students were less likely to seek help compared to female students. There are few existing studies that have focused on the mental health of students at universities established after 1992 from existing polytechnics. Coventry University exceeds the Government benchmark targets for recruiting students from non-traditional backgrounds. Our results show that it is these groups of students who are more likely to experience mental health problems.     

Revealing negative thinking in recovered major depression: a preliminary investigation

Previous research suggests that formerly dysphoric individuals engage in effortful strategies (e.g., thought suppression) that may mask underlying depressive thinking. The addition of a cognitive load, such as recalling a 6-digit number, which interferes with effortful mental control, reveals depressive thinking in formerly dysphoric individuals. This preliminary study tested whether this effect of cognitive load on revealing negative thinking generalizes to formerly clinically depressed patients. Currently depressed patients, recovered depressed patients and never-depressed patients unscrambled sentences that could form either positive or negative statements, after random allocation to either cognitive load or no cognitive load conditions. The number of negative statements unscrambled was used as an index of negative thinking. Without a load, recovered depressed patients did not differ from never-depressed controls: both groups completed fewer negative statements than currently depressed patients. However, the cognitive load increased negative statements in the recovered depressed group, making them resemble the currently depressed group more than the never-depressed group. These preliminary findings extend previous demonstrations of cognitive load unmasking negative thinking in dysphoric students to a clinical population, suggesting that formerly depressed patients utilize effortful strategies to minimize the report of negative thinking, which is undermined by the addition of a cognitive load.     

Vulnerability to mental contamination

Mental contamination refers to feelings of contamination that arise without physical contact with a contaminant. Mental contamination has been documented among sexual assault victims, some of whom report feeling dirty and wanting to wash in response to memories of the assault. This study examined variables associated with increased vulnerability to mental contamination. Female undergraduates (n=100) filled out a series of questionnaires and listened to an audiotape that instructed them to imagine experiencing a forced kiss by an undesirable male. Controls (n=20) imagined a consensual kiss by a desirable male. Women in the non-consensual condition reported stronger feelings of dirtiness and urge to wash than those in the consensual condition. Twenty-seven women in the non-consensual condition spontaneously rinsed in order to alleviate physical sensations evoked by the tape. Regression analyses revealed that significant predictors of dirtiness included contact contamination fear and disgust sensitivity, and there was a trend for anxiety sensitivity to predict dirtiness. Contact contamination fear was also a significant predictor of urge to wash. Prior experience with unwanted sexual contact was a significant predictor of rinsing, and there was a trend for fear of negative evaluation to predict rinsing. Discussion focuses on the implications of these findings for our understanding of mental contamination.     

Representing object colour in language comprehension

Embodied theories of cognition hold that mentally representing something red engages the neural subsystems that respond to environmental perception of that colour. This paper examines whether implicit perceptual information on object colour is represented during sentence comprehension even though doing so does not necessarily facilitate task performance. After reading a sentence that implied a particular colour for a given object, participants were presented with a picture of the object that either matched or mismatched the implied colour. When asked if the pictured object was mentioned in the preceding sentence, people's responses were faster when the colours mismatched than when they matched, suggesting that object colour is represented differently to other object properties such as shape and orientation. A distinction between stable and unstable embodied representations is proposed to allow embodied theories to account for these findings.     

Power affects basic cognition: Increased attentional inhibition and flexibility

The present article examines effects of power on basic cognition. It proposes that power bolsters the ability to attend to information selectively; enhancing the processing of information that is related to accessible constructs in detriment of peripheral, less accessible information. In contrast, powerlessness increases attunement to peripheral information, inducing greater distractibility and less attentional flexibility. Experiment 1 focuses on attention to an object and its context. Experiment 2 examines attentional focus and readiness to act. Experiment 3 examines attention to global vs. local aspects of a focal target. Powerful individuals, relative to powerless individuals, showed greater ability to inhibit peripheral information, and greater ability to focus attention in line with the demands of the task. Furthermore, inhibiting peripheral information facilitated action. The consequences of these findings for different domains are discussed.