A tutorial on some issues and methods in serial pattern research

In a review of major trends in serial pattern research, the issue of structural ambiguity and its relationship to representations of hierarchical and nonhierarchical patterns is considered. Also discussed is the role of various kinds of serial rules that can relate events within a sequence (e.g., nominal, ordinal, interval rules), as well as new developments in representing time relationships. Some practical problems that arise in the study of perception of serial structure are shown to involve its formal specification and the enlistment of appropriate controls. Major pitfalls are illustrated using recent research with music-like patterns (e.g., Deutsch, 1980).     

Rate and structure in memory for auditory patterns

Musically knowledgeable listeners heard auditory patterns based on sets of six (Study 1) or eight tones (Study 2). In the first study, listeners ordered events from patterns generated by hierarchical rule trees and which possessed different pitch space and time structures: one type (nondistance nested) was more likely to produce auditory streaming than the other (distance nested). In the second study, different listeners reconstructed pitch intervals contained in one of eight patterns. Patterns differed according to (1) levels of pitch distance occur), (2) levels of pattern contour (two), and (3) rate (two). In both studies, fast patterns with many large pitch distances were more difficult to recollect. Listeners in the second study telided to “telescope” pitch distances. Most difficult were those rapid sequences with large patch intervals combined into a changing contour (nondistance nested); these patterns streamed. A third study replicated effects due to differences in pitch distances observed in Study 2. Results were interpreted in terms of a rhythmic theory of memory.     

Impairment of syntax and lexical semantics in a patient with bilateral paramedian thalamic infarction

Bilateral vascular thalamic lesions are rare. Although a variety of neurobehavioral manifestations have been described, the literature is less documented with regard to accompanying linguistic disturbances. This article presents an in-depth neurolinguistic analysis of the language symptoms of a patient who incurred bilateral paramedian ischemic damage of the thalamus. In the post-acute phase of the stroke, a unique combination of transcortical sensory aphasia with syntactic impairment was found. Because of this atypical semiological association, additional analyses of spontaneous speech were performed. In spite of the typological affinity with the grammatic characteristic of marked simplification of syntax observed in Broca's aphasia, only a wordclass specific, lexical-semantic deficit for verbs was objectified. The hypothesis that lexical-semantic disturbances in our patient might result from a functional deafferentiation of both thalami with the frontal lobe is supported by: (1) associated neuropsychological deficits of frontal origin and (2) frontal-like behavioral disturbances.     

Higher order pattern structure influences auditory representational momentum

Representational momentum refers to the phenomenon that observers tend to incorrectly remember an event undergoing real or implied motion as shifted beyond its actual final position. This has been demonstrated in both visual and auditory domains. In 5 pitch discrimination experiments, listeners heard tone sequences that implied either linear, periodic, or null motions in pitch space. Their task was to judge whether the pitch of a probe tone following each sequence was the same or different from the final sequence tone. Results suggested that listeners made errors consistent with extrapolation of coherent pitch patterns (linear, periodic) but not with incoherent (null) ones. Hypotheses associated with internalized physical principles and pattern-based expectations are discussed.     

Developmental transition of EEG spectra to alpha band in a sample of children with developmental disabilities

Developmental transition of EEG spectra to alpha band of 14 children with developmental disabilities (from 7 yr. and 3 mo. to 16 yr. and 1 mo. of age at the first EEG recording: M= 13.2, SD=2.6; 6 girls and 8 boys) was studied by auto-power spectrum analysis longitudinally. The results showed the mean age (14.1 yr. to 14.8 yr. in the four regions of the frontal, central, parietal, and occipital regions) for subjects and their mean frequency (4.2 Hz to 4.7 Hz in the 4 regions) at which EEG shift started from theta band, and those means (15.1 yr. to 15.7 yr. and 9.5 Hz to 9.6 Hz in the 4 regions) at which EEG shift reached the alpha band. Prior EEG research on healthy children has shown that approximately 10 years of age is critical for developmental transition of EEG spectra to alpha frequencies. It is suggested that the present data showed a delay of this critical age for this sample of children with developmental disabilities relative to 10 years for healthy children reported by Katada, et al. and Benninger, et al.     

Fragment difficulty in priming on word-completion tests

Word-fragment completion is a frequently used test in implicit memory research. In this test priming is the relevant variable. Priming is obtained by subtracting the proportion of nonstudied word fragments correctly completed (called "completion difficulty baseline") from the studied word fragments correctly completed. Since completion difficulty can spuriously vary greatly between experimental conditions, its effect on magnitude of priming is studied. Normative frequency of occurrence of target words was considered because their influence over performance is known. In an experiment using a word-fragment completion test, participants' completion of fragments at three levels of completion difficulty and two levels of frequency was tested. Analysis showed that completion difficulty had a significant effect on global priming. The priming magnitude was higher for Difficult and Moderately Difficult fragments than for Easy ones. An interaction between fragment difficulty and normative word frequency was observed. When the fragments were easy to complete, the expected effect of higher priming for low-frequency words than for high-frequency words was not observed.     

How exposure to real conspiracy theories motivates collective action and political engagement? Τhe moderating role of primed victimhood and underlying emotional mechanisms in the case of 2018 bushfire in Attica

Conspiracy theories concern milestone events, mobilizing various explanations. However, there is still emerging research on how conspiracy beliefs mobilize normative and nonnormative collective action, as well as political engagement and what the emotional underpinnings of such effects are. We conducted two experimental studies (Study 1, N = 301 and Study 2, N = 328) on exploring the relationship between exposure to conspiracy theories and normative, nonnormative collective action and political engagement, moderated by primed victimhood and mediated by fear/anxiety and anger emotional indices. Results in Study 1 showed that exposure to conspiracy theories decreases normative collective action, but increases nonnormative collective action, negative emotions of anger and fear/anxiety and political engagement. In Study 2 we confirmed findings of Study 1, but these effects were moderated by primed victimhood. Study 2 also showed that anger index, but not fear/anxiety index, significantly mediated the moderating interaction effect between exposure to conspiracy theories and primed victimhood on the (non)normative collective action and political engagement. Results are discussed in light of the broader impact of circulation of conspiracy theories and their effective tackle amidst societal traumas.     

Effects of attentional set and rhythmic complexity on attending

In a target detection task involving sustained attentional monitoring, rhythmic properties of tone sequences were found to affect detection performance (area under receiver-operating characteristic curves) and reaction times. Alternating tone frequencies (high, low) formed three different recurrent rhythms (binary, trinary, mixed) which varied in complexity. Attentional set was also manipulated so that participants attended either to tones of both frequencies (divided) or to only the higher of the two tones (selective). The most interesting finding involved an interaction between attentional set and rhythm, indicating that selective attending is enhanced by the most complex (mixed) rhythm, whereas divided attending tends to be best with the simplest rhythm (binary). Results are discussed in terms of a theory of dynamic attending, in which it is assumed that listeners actively use attending oscillators to direct attending.