Individual gustatory reaction times to various groups of chemicals that provoke basic taste qualities

Reaction times (RTs) to four groups of substances that provoke different taste qualities were measured. Measurements for all substances with the same taste, equalized in perceived intensity and provoking a very strong taste, were made concurrently for each subject. The comparisons were made on the individual level. No significant differences in RTs to substances with the same taste quality were found. When the factor of perceived intensity is kept constant, no effect of the stimulus chemical composition on RTs seems to be present. RTs to stimuli with different tastes differ significantly, the shortest being to salt and the longest to bitter. The difference in RTs for sour and sweet substances is small, and the subjects were not all alike in terms of the order of RTs with respect to these stimuli.     

Influence of the intensity of NaCl solutions on adaptation degree and recovery time course

The degree of adaptation and the time course of recovery after adaptation to NaCl solutions of various intensities were examined by magnitude estimation and simple sensory reaction time using a test stimulus of constant intensity. The results show that the degree of adaptation increased with the adapting concentration following a negatively accelerated function. Similarly, all recovery curves were negatively accelerated functions of the recovery time. The relation between the recovery constant (time necessary to attain two-thirds of normal responsivity) and adapting concentration approximates with both criteria more or less a linear function. Thus the recovery constant is a positively accelerated function of the degree of adaptation. The relationship between concentration and degree of adaptation can be approximated by Beidler’s equation of taste stimulation, while the time course of recovery can be expressed by an exponential equation that can also be related to Beidler’s theory. The two criteria used showed similar deteriorating effects of taste adaptation, indicating that reaction time can also be a useful criterion of the level of sensory responsivity.     

Psychometric properties and concurrent validity of two exercise addiction measures: A population wide study

ObjectivesThe existence of exercise addiction has been examined in numerous studies. However, none of the measures developed for exercise addiction assessment have been validated on representative samples. Furthermore, estimates of exercise addiction prevalence in the general population are not available. The objective of the present study was to validate the Exercise Addiction Inventory (EAI; Terry, Szabo, & Griffiths, 2004), and the Exercise Dependence Scale (EDS; Hausenblas & Downs, 2002b), and to estimate the prevalence of exercise addiction in general population.DesignExercise addiction was assessed within the framework of the National Survey on Addiction Problems in Hungary (NSAPH), a national representative study for the population aged 18–64 years (N = 2710).Method474 people in the sample (57% males; mean age 33.2 years) who reported to exercise at least once a week were asked to complete the two questionnaires (EAI, EDS).ResultsConfirmatory Factor Analysis (CFA) indicated good fit both in the case of EAI (CFI = 0.971; TLI = 0.952; RMSEA = 0.052) and EDS (CFI = 0.938; TLI = 0.922; RMSEA = 0.049); and confirmed the factor structure of the two scales. The correlation between the two measures was high (r = 0.79). Results showed that 6.2% (EDS) and 10.1% (EAI) of the population were characterized as nondependent-symptomatic exercisers, while the proportion of the at-risk exercisers were 0.3% and 0.5%, respectively.ConclusionsBoth EAI and EDS proved to be a reliable assessment tool for exercise addiction, a phenomenon that is present in the 0.3–0.5% of the adult general population.     

A new protocol for investigating visual two-choice discrimination learning in lizards

Animal Cognition - One of the most widely studied abilities in lizards is discrimination learning. The protocols used to test lizards are often novel or adapted from other taxa without proper...     

Impaired semantic memory during acute transient global amnesia

As a clinical model of hippocampal dysfunction, transient global amnesia (TGA) causes reversible memory disturbance. While episodic memory deficits in TGA patients have been extensively described, data regarding semantic memory involvement are sparse and contradictory. We report impaired semantic fluency performance in 16 patients with hippocampal lesions on MRI during acute TGA compared to their performance one day later and to that of 20 healthy subjects. Our findings support the involvement of the hippocampus in semantic retrieval.     

Adaptation effects on evoked electrical taste

In spite of a clear increment in absolute thresholds as an effect of self-adaptation, the electrically provoked taste sensation does not show a reduction in subjective intensity during the protracted stimulation time. Chemical cross-adaptation effects on the threshold and suprathreshold levels of electrical taste are observed only when the adapting solutions are electrolytes regardless of their taste qualities. It seems that the stability of perceived intensity during current flow is principally due to some irritation of the sensitive tissue of the tongue, whereas cross-adaptation effects may be attributed to the potential changes across the excitable membranes caused by electrical properties of adapting electrolytic solutions.     

Bidirectional Effects of Positive Affect,Warmth, and Interactions Between Mothers With and Without Symptoms of Depression and Their Toddlers

Maternal depression has negative implications for parenting and child outcomes, but it is also important to understand the daily transactional interactions that occur between mothers varying in symptoms of depression and their children. The current study aimed to examine immediate bidirectional effects between maternal warmth and positive affect and toddler affect in a sample of mothers varying in symptoms of depression. Ninety-one mothers and their 24-month-old toddlers completed a laboratory free-play/clean-up task. Mothers rated their symptoms of depression using the CES-D, and maternal warmth and positive affect and toddler positive and negative affect were observationally coded from a free-play and clean-up laboratory task. Sequential analyses indicated that mothers with no or mild symptoms of depression exhibited mutual positive affect with their children, but mothers with more severe symptoms of depression did not. Mothers with higher symptoms of depression displayed a decrease in warmth concurrent with toddlers’ positive affect. Further, unlike dyads in which mothers had higher symptoms of depression, dyads of mothers with lower symptoms appeared to exhibit some covariation in positive affect across the episode. These results provide evidence that even in non-clinical samples, affective manifestations of mothers’ subthreshold levels of depression may have negative immediate effects on toddlers’ emotions, and that mothers without symptoms of depression may have more reciprocal affective exchanges with their toddlers.     

The role and impact of affect in the process of resistance to persuasion

This investigation dealt with the role and impact of affect in the process of resistance. A total of 597 participants took part in the study in 4 phases spanning 6 weeks. Initial results indicated that the cognitive, affective‐anger, and affective‐happiness inoculation treatments all conferred resistance to persuasive attacks. Structural equation analyses were conducted on the cognitive, affective‐anger, and affective‐happiness experimental inoculation conditions in order to examine the process of resistance. The results across all 3 conditions revealed a direct path in which inoculation treatments directly induced resistance to persuasive attacks. However, indirect paths to resistance varied across the 3 experimental conditions. Cognitive inoculation treatments contributed to receiver threat and counterarguing output, which, in turn, enhanced resistance. Thus, the cognitive inoculation treatments triggered a process that is consistent with McGuire's theoretical explanation for resistance. By contrast, both affective‐anger and affective‐happiness inoculation treatments relied more heavily on elicited emotional responses. Finally, the results indicated that greater receiver involvement was positively associated with experienced anger and, therefore, indirectly contributed to resistance, whereas greater receiver self‐efficacy tended to dampen resistance.     

Time course of recovery from gustatory adaptation to NaCl.

Recovery from adaptation to NaCl was tested by comparing some relevant parameters of response to the adapting and test stimuli separated by different recovery intervals. The time course of response was determined using magnitude estimations and using the flow chamber for stimulus delivery. The course of recovery for all parameters used was a negatively accelerated function of the rest time, but the recovery rate of different parameters did not prove to be equal. Recovery was fastest for the initial maximum taste magnitude, followed by the time needed for the taste to disappear. The taste effect summed over time and the time required for the taste magnitude to decrease to 30% of its preadapted maximum were the slowest to recover. Although the recovery processes proceeded at a rapid rate during the initial period, all parameters remained depressed over a rather long period.