On Sex-Related Differences in Auditory and Visual Sensory Functioning

The present study was designed to elucidate sex-related differences in two basic auditory and one basic visual aspect of sensory functioning, namely sensory discrimination of pitch, loudness, and brightness. Although these three aspects of sensory functioning are of vital importance in everyday life, little is known about whether men and women differ from each other in these sensory functions. Participants were 100 male and 100 female volunteers ranging in age from 18 to 30years. Since sensory sensitivity may be positively related to individual levels of intelligence and musical experience, measures of psychometric intelligence and musical background were also obtained. Reliably better performance for men compared to women was found for pitch and loudness, but not for brightness discrimination. Furthermore, performance on loudness discrimination was positively related to psychometric intelligence, while pitch discrimination was positively related to both psychometric intelligence and levels of musical training. Additional regression analyses revealed that each of three predictor variables (sex, psychometric intelligence, and musical training) accounted for a statistically significant portion of unique variance in pitch discrimination. With regard to loudness discrimination, regression analysis yielded a statistically significant portion of unique variance for sex as a predictor variable, whereas psychometric intelligence just failed to reach statistical significance. The potential influence of sex hormones on sex-related differences in sensory functions is discusse

Differences in duration discrimination of filled and empty auditory intervals as a function of base duration

In the present experiments, participants were presented with two time intervals that were marked by auditory signals, and their task was to decide which of the two was longer in duration. In Experiment 1, the base durations were 50 and 1,000msec, whereas in Experiment 2, seven different base durations ranging from 50 to 1,000 msec were employed. It was found that filled intervals (continuous tones) were discriminated more accurately than empty intervals (with onset and offset marked by clicks) at the 50-msec base duration, whereas no performance differences could be shown for longer ones. The findings are consistent with the notion of a unitary timing mechanism that governs the timing of both filled and empty auditory intervals, independent of base durations. A likely conceptual framework that could explain better performance with filled as compared with empty intervals represents an information-processing model of interval timing that evolved from scalar timing theory. According to this account, a performance decrement observed with empty intervals may be due to a misassignment of pulses generated by an internal pacemake

Auditory and visual temporal sensitivity: evidence for a hierarchical structure of modality-specific and modality-independent levels of temporal information processing

The present study investigated modality-specific differences in processing of temporal information in the subsecond range. For this purpose, participants performed auditory and visual versions of a rhythm perception and three different duration discrimination tasks to allow for a direct, systematic comparison across both sensory modalities. Our findings clearly indicate higher temporal sensitivity in the auditory than in the visual domain irrespective of type of timing task. To further evaluate whether there is evidence for a common modality-independent timing mechanism or for multiple modality-specific mechanisms, we used structural equation modeling to test three different theoretical models. Neither a single modality-independent timing mechanism, nor two independent modality-specific timing mechanisms fitted the empirical data. Rather, the data are well described by a hierarchical model with modality-specific visual and auditory temporal processing at a first level and a modality-independent processing system at a second level of the hierarch

Sadder but fitter. The evolutionary function of depressive symptoms following fetal loss

A literature review about an evolutionary model of fetal loss depression is presented. This model conceptualizes depression following miscarriage or stillbirth as an evolutionary protective mechanism to avoid further fetal loss. It postulates that depressive symptoms delay the next reproduction and save maternal resources. These symptoms along with hypochondric symptoms of depression which lead to a search for causes and reappraisal of environmental factors, are probably adaptations to causes of further fetal loss (e.g. epidemics, famines, infections, environmental toxins)

Zur wahrgenommenen Intensität adaptiver und maladaptiver Emotionen im Kontext rationaler und irrationaler Kognitionen

In the theoretical foundations of Rational-Emotive Behavior Therapy (REBT) Albert Ellis distinguishes between irrational (overreaching and rigid) cognitions, which result in maladaptive emotions, and rational cognitions (realistic expectations and preferences), which result in adaptive emotions. Present studies confirm substantial differences between adaptive and maladaptive emotions with regard to numerous relevant variables of emotion theories (in particular: functionality). Perceived intensity of adaptive and maladaptive emotions has not been investigated so far. By using experimental scenario studies (N = 158) possible differences of intensity between adaptive and maladaptive emotions are investigated. It is hypothesized, that maladaptive emotions are more strongly perceived by irrational thinkers than by rational thinkers whereas adaptive emotions should be perceived more intensively by rationally thinking persons. A first study reveals a higher perceived intensity of maladaptive emotions in comparison to adaptive emotions. A second study demonstrates that generally more intense emotions are attributed to people having irrational beliefs. However this tendency is significantly stronger for maladaptive emotions. Possible explanations for this limited support of the hypotheses are discussed.Albert Ellis geht in seiner Rational Emotiven Therapie davon aus, dass irrationale (übersteigerte und rigide) Kognitionen zu maladaptiven Emotionen führen, während rationale Kognitionen (realistische Erwartungen und Präferenzen) adaptive Emotionen zur Folge haben. Bisherige Studien zeigen, dass sich adaptive und maladaptive Emotionen hinsichtlich zahlreicher emotionstheoretisch relevanter Variablen unterscheiden, insbesondere hinsichtlich Funktionalität; die wahrgenommene Intensität adaptiver und maladaptiver Emotionen im Kontext entsprechender Kognitionen wurde bisher nicht untersucht. Anhand experimenteller Szenariostudien (N = 158) soll untersucht werden, ob sich adaptive und maladaptive Emotionen in ihrer Intensität unterscheiden. Zudem wird als Hypothese aufgestellt, dass maladaptive Emotionen von irrational denkenden Personen intensiver erlebt werden als von rational Denkenden. Adaptive Emotionen hingegen sollten von rational denkenden Menschen intensiver wahrgenommen werden. Eine erste Studie zeigt eine generell höhere Intensität maladaptiver Emotionen im Vergleich zu adaptiven Emotionen. Zur Überprüfung der Hypothese wird eine zweite Studie durchgeführt. Die Ergebnisse zeigen, dass Personen mit irrationalen Kognitionen generell intensivere Emotionen zugeschrieben werden als rational Denkenden. Dieser Effekt zeigt sich jedoch signifikant stärker für maladaptive Emotionen. Mögliche Erklärungen für die nur partielle Bestätigung der Hypothese werden diskutiert

Ist Personenwahrnehmung im Attributionsgeschehen abhängig vom Ort der Erhebung?

Als zentraler Befund der ersten Untersuchung der einflussreichen Arbeit von Heider und Simmel [Am. J. Psychol., 57, 243-59 (1944)] zeigte sich, dass bewegte geometrische Objekte ganz überwiegend als Lebewesen wahrgenommen werden und diese wiederum meist als Personen. Da die Originaluntersuchung, die am Smith College für Psychologie durchgeführt wurde, nur Frauen miteinbezog und die Ergebnisse keine genauen Angaben zur Häufigkeit personaler Kausalität beinhalten, werden zwei Replikationen durchgeführt, um die Befunde auf eine breiter generalisierbare Basis zu stellen. In Studie eins wird die Untersuchung unter Verwendung des Originalversuchsmaterials an einer technischen Hochschule an Nichtpsychologen durchgeführt. Es zeigt sich auch bei konservativer Analyse, dass geschlechtsunabhängig weniger als 35 % der Teilnehmenden die Objekte als Lebewesen beschreiben. Von denjenigen, die die Objekte als beseelt wahrnehmen, werden diese in 80 % der Fälle als Menschen bezeichnet. Um eine mögliche Erklärung dieser deutlichen Abweichungen von den Originalbefunden zu finden, wird Studie zwei in Entsprechung zur Originalarbeit an einem Institut für Psychologie ausschließlich an Psychologiestudierenden durchgeführt. Jedoch zeigen sich auch hier identische Befunde. Somit konnten in zwei Replikationen zentrale Befunde der klassischen Arbeit nicht repliziert werden. Die Verwendung einer selektiven Stichprobe in unterschiedlichen Umgebungen erklärt nicht die klassischen Resultate

The effects of type of interval, sensory modality, base duration, and psychophysical task on the discrimination of brief time intervals

The present study was designed to investigate the influences of type of psychophysical task (two-alternative forced-choice [2AFC] and reminder tasks), type of interval (filled vs. empty), sensory modality (auditory vs. visual), and base duration (ranging from 100 through 1,000 ms) on performance on duration discrimination. All of these factors were systematically varied in an experiment comprising 192 participants. This approach allowed for obtaining information not only on the general (main) effect of each factor alone, but also on the functional interplay and mutual interactions of some or all of these factors combined. Temporal sensitivity was markedly higher for auditory than for visual intervals, as well as for the reminder relative to the 2AFC task. With regard to base duration, discrimination performance deteriorated with decreasing base durations for intervals below 400 ms, whereas longer intervals were not affected. No indication emerged that overall performance on duration discrimination was influenced by the type of interval, and only two significant interactions were apparent: Base Duration × Type of Interval and Base Duration × Sensory Modality. With filled intervals, the deteriorating effect of base duration was limited to very brief base durations, not exceeding 100 ms, whereas with empty intervals, temporal discriminability was also affected for the 200-ms base duration. Similarly, the performance decrement observed with visual relative to auditory intervals increased with decreasing base durations. These findings suggest that type of task, sensory modality, and base duration represent largely independent sources of variance for performance on duration discrimination that can be accounted for by distinct nontemporal mechanisms

Duration discrimination in the range of milliseconds and seconds in children with ADHD and their unaffected siblings

Background Detecting genetic factors involved in attention deficit hyperactivity disorder (ADHD) is complicated because of their small effect sizes and complex interactions. The endophenotype approach eases this by coming closer to the relevant genes. Different aspects of temporal information processing are known to be affected in ADHD. Thus, some of these aspects could represent candidate endophenotypes for ADHD. Method Fifty-four sib-pairs with at least one child with ADHD and 40 control children aged 6-18 years were recruited and asked to perform two duration discrimination tasks, one with a base duration of 50 ms on automatic timing and one with a base duration of 1000 ms on cognitively controlled timing. Results Whereas children with ADHD, but not their unaffected siblings, were impaired in discrimination of longer intervals, both groups were impaired in discriminating brief intervals. Furthermore, a significant within-family correlation was found for discrimination of brief intervals. Task performances of subjects of the control group correlated with individual levels of hyperactivity/impulsivity for discrimination of brief intervals, but not of longer intervals. Conclusions Cognitively controlled and also automatic processes of temporal information processing are impaired in children with ADHD. Discrimination of longer intervals appears as a typical ‘disease marker' whereas discrimination of brief intervals shows up as a ‘vulnerability marker'. Discrimination of brief intervals was found to be familial and linked to levels of hyperactivity/impulsivity. Taken together, discrimination of brief intervals represents a candidate endophenotype of ADH

Time perception and its neuropsychological correlates in patients with schizophrenia and in healthy volunteers

Disordered time perception has been reported in schizophrenia. We investigated time perception dysfunction and its neuropsychological correlates in patients with schizophrenia. Participants comprised 38 patients and 38 age- and sex-matched healthy volunteers who were compared in an auditory temporal bisection paradigm using two interval ranges (a 400/800 ins condition and a 1000/2000 ms condition). In the temporal bisection, subjects were required to categorise a probe duration as short or long, based upon the similarity with two reference durations. All subjects also completed a battery of neuropsychological tests measuring sustained attention, short- and long-term memory and executive function. In the 400/800 ins condition, patients judged durations significantly shorter than did control subjects. Patients also exhibited decreased temporal sensitivity in both conditions. We found in both groups a negative association between temporal sensitivity and sustained attention for the 400/800 ms condition, and between temporal sensitivity and long-term memory for the 1000/200 ms condition. In patients, short-term memory performance was negatively associated with duration judgement in both conditions, while executive dysfunction was correlated to a general performance deficit in the 400/800 ms condition. These findings suggest the possibility that time perception abnormalities in schizophrenia are part of neuropsychological dysfunction and are likely to adversely impact upon activity of daily living. (c) 2008 Elsevier Ireland Ltd. All rights reserved

Temporal order in memory and interval timing: An interference analysis

The effect of varying load in memory tasks performed during a time interval production was examined. In a first experiment, increasing load in memory search for temporal order affected concurrent time production more strongly than varying load in a spatial memory task of equivalent difficulty. This result suggests that timing uses some specific resources also required in processing temporal order in memory, resources that would not be used in the spatial memory task. A second experiment showed that the interference between time production and memory search involving temporal order was stronger when, during the timing task, a decision was made on the temporal position of a memory item, than when information on temporal order was retained throughout the interval to be produced. These results underscore the importance of considering the specific resources and processes involved when the interference between timing and concurrent nontemporal tasks is analyzed