Frequency Judgments Research Articles

Disentangling Temporal and Rate Codes in the Primate Somatosensory Cortex.

Millisecond-scale temporal spiking patterns encode sensory information in the periphery, but their role in the neocortex remains controversial. The sense of touch provides a window into temporal coding because tactile neurons often exhibit precise, repeatable, and informative temporal spiking patterns. In the somatosensory cortex (S1), responses to skin vibrations exhibit phase locking that faithfully carries information about vibratory frequency. However, the respective roles of spike timing and rate in frequency coding are confounded because vibratory frequency shapes both the timing and rates of responses. To disentangle the contributions of these two neural features, we measured S1 responses as rhesus macaques performed frequency discrimination tasks in which differences in frequency were accompanied by orthogonal variations in amplitude. We assessed the degree to which the strength and timing of responses could account for animal performance. First, we showed that animals can discriminate frequency, but their performance is biased by amplitude variations. Second, rate-based representations of frequency are susceptible to changes in amplitude but in ways that are inconsistent with the animals' behavioral biases, calling into question a rate-based neural code for frequency. In contrast, timing-based representations are highly informative about frequency but impervious to changes in amplitude, which is also inconsistent with the animals' behavior. We account for the animals' behavior with a model wherein frequency coding relies on a temporal code, but frequency judgments are biased by perceived magnitude. We conclude that information about vibratory frequency is not encoded in S1 firing rates but primarily in temporal patterning on millisecond timescales.

Proxy reports of others’ behaviors: when are they more accurate?

ABSTRACT Surveys often ask people to report about someone else’s behavior. Two approaches to constructing a behavioral frequency judgment are recalling specific episodes of the other person’s behavior or using more general knowledge to infer a frequency judgment. A two-stage study was conducted with 40 roommate-pairs who maintained diaries for 7-days and then reported behavioral frequencies for themself and their roommate. Behavior regularity and relationship closeness were also measured. When general knowledge is cued, judgment error is negatively related to behavior regularity and relationship closeness, while cuing episodic-based recall resulted in less judgment error when regularity and relationship closeness are low.

The perception of dramatic risks: Biased media, but unbiased minds

In their famous study on risk judgments, Lichtenstein, Slovic, Fischhoff, Layman, and Combs (1978) concluded that people tend to overestimate the frequencies of dramatic causes of death (e.g., homicide, tornado) and underestimate the frequencies of nondramatic ones (e.g., diabetes, heart disease). Further, their analyses of newspapers indicated that dramatic risks are overrepresented in the media—suggesting that people's distorted risk perceptions might be driven by distortions in media coverage. Although these patterns were not evaluated statistically in the original analyses, the conclusions have become a staple in the social sciences. How reliable are they? And are they replicable? In a systematic literature search, I identified existing replications of Lichtenstein et al.'s investigation and submitted both the original data and the data from the replications to a Bayesian statistical analysis. All datasets indicated very strong evidence for an overrepresentation of dramatic risks and an underrepresentation of nondramatic risks in media coverage. However, a reliable overestimation (underestimation) of dramatic (nondramatic) risks in people's frequency judgments emerged only in Lichtenstein et al.'s dataset; it did not replicate in the other datasets. In fact, aggregated across all datasets, there was evidence for the absence of a differential distortion of dramatic and nondramatic causes of death in people's risk frequency judgments. Additional analyses suggest that when judging risk frequency, people rely on samples from their personal social networks rather than from the media. The results reveal a limited empirical basis for the common notion that distortions in people's risk judgments echo distortions in media coverage. They also suggest that processes of risk frequency judgments include a metacognitive mechanism that is sensitive to the source of mentally available samples.

Irrelevant speech, changing state, and order information.

The changing state effect is the finding that a stream of irrelevant sounds that change more (e.g., different digits in random order) disrupts memory more than a stream of irrelevant sounds that change less (e.g., a single digit repeated over and over). According to the Object-Oriented Episodic Record (O-OER) model, the changing state effect will be observed only in memory tasks that have an order component or which induce serial rehearsal or serial processing. In contrast, other accounts-including the Feature Model, the Primacy Model, and various attentional theories-predict that the changing state effect should be observable when there is no order component. Experiment 1 first demonstrated that the irrelevant stimuli created for the current experiments produced a changing state effect in immediate serial recall in both on-campus and online samples. Then, three experiments assessed whether a changing state effect is observable in a surprise 2AFC recognition test. Experiment 2 replicated Stokes and Arnell (2012, Memory & Cognition, 40, 918-931), who found that although irrelevant sounds reduce performance on a surprise recognition test of words presented previously in a lexical decision task, they do not produce a changing state effect. Experiments 3 and 4 used two different encoding tasks (pleasantness and frequency judgment) and also found no changing state effect. The results support the prediction of the O-OER model and provide additional evidence against the other accounts.

Learning spatial frequency identification through reweighted decoding.

Perceptual learning, the improvement of perceptual judgments with practice, occurs in many visual tasks. There are, however, relatively fewer studies examining perceptual learning in spatial frequency judgments. In addition, perceptual learning has generally been studied in two-alternative tasks, occasionally in n-alternative tasks, and infrequently in identification. Recently, perceptual learning was found in an orientation identification task (eight-alternatives) and was well accounted for by a new identification integrated reweighting theory (I-IRT) (Liu et al., submitted). Here, we examined perceptual learning in a similar eight-alternative spatial frequency absolute identification task in two different training protocols, finding learning in the majority but not all observers. We fit the I-IRT to the spatial frequency learning data and discuss possible model explanations for variations in learning.

Collocational Links in the Multilingual Mind: Frequency Intuitions and Association Strength Measures

Collocations are ubiquitous in everyday language, which help language users sound more natural and ease the processing burden during language production. They are also commonly taught in foreign language classrooms and those learners who can master these prevalent word combinations and chunks get to use the language more fluently as they enjoy a processing advantage. There are different approaches to the definition of these frequently co-occurring word combinations, but the current study embraces the frequentist approach which adopts a corpus linguistic technique and tries to combine corpus linguistics and user intuition data in its interpretations. Collocations have been extensively investigated from many different angles using both corpus linguistics and psycholinguistics techniques so far. Having its spark in the theory of collocational priming, the present study attempts to (a) investigate the relationship between corpus-driven association measures and the collocational frequency judgements of L1 Turkish-L2 English-L3 Italian users, (b) analyse the possible effect of congruence across the languages on the frequency relationship, (c) question if there is a difference between L1 Italian users’ and L3 Italian users’ sensitivity towards collocational strength based on their collocational frequency intuitions in Italian and (d) find humble evidence for the psycholinguistic reality of collocations in the L3 Italian mental lexicon, if any. The results indicate that language users’ frequency judgements in L2 English and L3 Italian correlate with an association measure (t-score) and the frequency of congruent items are judged more accurately. Additionally, L3 Italian users’ frequency intuitions overlap with native Italian users to a certain extent. The findings are discussed in the light of the earlier research on usage-based language use and frequency intuition.

Investigating First and Second Language Speaker Intuitions of Phrasal Frequency and Association Strength of Multiword Sequences

AbstractIn this study, we investigated the accuracy of first language (L1) and second language (L2) speakers’ intuitive judgments of phrasal frequency and collocation strength, and examined the linguistic influences that give rise to these judgments. L1 and L2 speakers of English judged 180 adjective–noun collocations as (a) high frequency, medium frequency, or low frequency and (b) high association, medium association, or low association. Results showed that neither L1 nor L2 speakers demonstrated accurate intuitive judgments of phrasal frequency and association strength. Both groups of participants employed linguistic information at phrase and single‐word levels when giving intuitive statistical estimates. We found judgments of phrasal frequency and association strength to be intertwined for both L1 and L2 speakers. Taken together, these findings shed new insight on understanding language users’ statistical knowledge of multiword sequences.

Familiarity Deficits for Words and Objects in Amnestic Mild Cognitive Impairment in a Context Minimizing the Role of Recollection.

Amnestic mild cognitive impairment (aMCI) is associated with cortical thinning in perirhinal and entorhinal cortices, key regions of the brain supporting familiarity. Individuals with aMCI demonstrate familiarity deficits in their behavior, often repeating questions in the same conversation. While familiarity deficits in healthy aging are minimal, past studies measuring familiarity in aMCI have mixed results, perhaps due to the influence of recollection. We therefore used a paradigm that minimized the influence of recollection, and hypothesized that familiarity would be impaired in aMCI relative to age-matched controls, but not in healthy older adults relative to younger adults. We also hypothesized that familiarity deficits in aMCI would be greater for objects than words because the perirhinal cortex plays a significant role in visual discrimination. A sample of 36 younger adults, 38 cognitively intact older adults, and 30 older adults with aMCI made absolute frequency judgments for words and objects seen a variable number of times in an incidental encoding task. Estimates of familiarity were derived from correlating participants' frequency judgments with the actual frequency of presentation. Familiarity was largely spared in healthy aging, with minor deficits in familiarity for words. Familiarity deficits were evident in aMCI comparably for words and objects. The present research underscores the need to study familiarity in contexts minimizing recollection, particularly when comparing groups with different levels of recollection, and adds to our understanding of the phenomenology of aMCI. Familiarity deficits may provide an early biomarker of dementia risk.

Reactivity from judgments of learning is not only due to memory forecasting: evidence from associative memory and frequency judgments.

Research has shown that judgments of learning (JOLs) often produce a reactive effect on the learning of cue-target pairs in which target recall differs between participants who provide item-based JOLs at study versus those who do not. Positive reactivity, or the memory improvement found when JOLs are provided, is typically observed on related pairs, while no reactivity is commonly found on unrelated pairs. In four experiments, we examined JOL reactivity effects by comparing JOL and no-JOL groups to other groups who engaged in relational-type encoding/judgment tasks. Experiment 1 replicated positive JOL reactivity effects with related pairs with an extension to symmetrically related pairs. Next, Experiment 2 found that providing judgments of associative memory—a task that does not involve memory predictions—yielded equivalent reactivity patterns as JOLs. Experiment 3 replicated this reactivity pattern using a frequency of co-occurrence judgment task. Finally, In Experiment 4, a similar positive reactivity pattern was found using a relational encoding task when compared to a standard JOL. Collectively, our results suggest that previous JOL reactivity patterns are not solely due to memory forecasting processes via JOLs and likely reflect relational encoding that is strategically applied towards related, but not unrelated pairs.Supplementary InformationThe online version contains supplementary material available at 10.1007/s11409-022-09301-2.

Prescriptivism on its own terms. Perceptions and realities of usage in Siegenbeek’s Lijst (1847)

ABSTRACT In 1847, one of the first professors of Dutch, Matthijs Siegenbeek (1774–1854), published a purist word list entitled Lijst van woorden en uitdrukkingen met het Nederlandsch taaleigen strijdende, ‘List of words and expressions at odds with the nature of Dutch’. In this pamphlet, he condemned a variety of loanwords and loan translations. Siegenbeek refers regularly to the usage of disapproved variants, employing a variety of quantifiers and sociolinguistic references. How well such statements reflect the linguistic reality, however, is a contentious issue in studies of prescriptivism. In this paper, we study Siegenbeek’s pronouncements about usage against the backdrop of Curzan’s concept of restorative prescriptivism. By studying the use of different types of quantifiers, and matching these to a text collection of historical fiction from the time, we show that Siegenbeek’s statements about usage miss the mark for most specific variables. However, when we look at the average usage frequency, we see that as frequency terms increase in strength, so do the number of condemned variants, both for relative frequency and absolute frequency. Based on these results, we argue for a re-evaluation of the relationship between prescriptivism and usage, and a reappreciation of prescriptivists’ frequency judgements.

Unambiguous Estimation of Multidimensional Parameters for Space Precession Targets With Wideband Radar Measurements

Micro-motion parameter estimation is a significant part in feature extraction of non cooperative targets, and precession is the common micro-motion form of space targets. However, most of the existing precession parameter estimation algorithms are based on pure precession condition assuming a constant nutation angle. Moreover, they do not consider the problems caused by nutation, such as a worse estimation accuracy, difficulties in estimating some parameters, and ambiguous frequency judgment. At the same time, the echoes from different scattering attribute components of the actual target also challenge the applicability of the existing algorithms. Therefore, this article proposes a robust and unambiguous algorithm for multidimensional parameter estimation. First, according to the modulation characteristics of micro-motion, the echoes from different scattering attribute components of the target are identified and separated for the applicability of the estimation algorithm. Second, considering the model of range variation curve, a robust way for precession parameter estimation is proposed to avoid worse accuracy and difficult estimation. Third, unambiguous judgment criteria are established by analyzing frequency spectrum distribution. Finally, multidimensional parameter estimation is realized, including motion feature and structure feature of the target. The proposed algorithm is also verified by electromagnetic analysis data.

Anchoring and Judgment Bias: Disregarding Under Uncertainty.

The current investigation examined the nature of the cognitive processes that underlie decision-making behavior. The focus of this project centered on the effects of utilizing heuristics that pertain to the availability of information stored in memory. Anchoring effects demonstrate that people will use any available information sampled from memory as a reference for making judgments of frequency. The specific aim of the experiment was to examine whether people exhibit patterns of behavior consistent with anchoring effects, revealed by corrupted subjective judgments, despite explicit notice of instruction to disregard the experimenter-supplied information (the anchor). Subjects failed to demonstrate an ability to disregard a relatively high anchor even when the instruction to do so was explicit. However, in contrast, subjects demonstrated an ability to disregard a relatively low anchor. More broadly, subjects instructed to disregard demonstrated a reduced effect of anchoring. Implications are considered within the context of the availability heuristic and the directly related effects of anchoring. The results may be interpreted within the framework of a dual-process model, two-system view that distinguishes intuition from reasoning. The present findings fit with well-supported theoretical explanations of anchoring effects, such as selective accessibility and numerical priming.

Judgments of frequency and duration: One or two underlying dimensions?

AbstractHowoftenand for howlonga certain object was encountered are two distinct questions, requiring two distinct answers. But when humans judge an object to have been presented often, they usually also judge it to have been presented for a long duration. Under certain conditions the reverse is also true: When an object has been presented for a long time, humans think it has been presented often. These mutual influences hint at a single underlying dimension on which judgments of frequency and duration are based. But the judgments also differ in certain respects, which instead speaks for two independent dimensions. In this article, from a novel formal perspective, we revisit arguments for and against unidimensional and two-dimensional models. To determine which of these models is supported empirically, we analyzed all available studies and tested an overlooked but critical condition that would allow us to draw a definitive conclusion. Our evidence speaks against a unidimensional model in all variants.

Frequency Judgment: The Relationship Between Judged and Actual Frequency

The exact nature of the relationship between judged and actual frequency of stimuli encountered outside experimental control has been an area of longstanding but limited interest for several decades. A growing consensus among researchers who examined this relationship is that it is nonlinear and best represented by a negatively accelerating function. However, researchers who examined the relationship sometimes did not compare tested nonlinear functions to what had already been reported in the literature or even a linear function. What is unclear is if a single nonlinear function, among those reported in the literature, can be used to represent the relationship between judged and actual frequency across a variety of stimuli encountered outside of experimental control. Two longstanding theories of frequency judgment have been shown to hold under various contexts and study methods. Whether the direct-coding theory or the memory strength theory of frequency judgment is supported when examining the response times across Likert-type response options has yet to be determined. The direct-coding theory seems to be supported by frequency judgment tasks where frequency information is controlled experimentally. The memory strength theory seems to be supported by frequency judgment tasks where frequency information is not experimentally controlled and accumulated over time. The direct-coding theory would be supported if no difference is found in response times between response options. The memory strength theory would be supported if the response times decreased monotonically from almost never to almost always. The current study showed that a negatively accelerating function best represented the relationship between judged and actual word frequency, judged and actual celebrity frequency, and judged and actual supermarket sales frequency. Further, a single nonlinear model (i.e., the Weber-Fechner law) best represented this relationship across all stimulus sets. The current study also showed that direct-coding theory was not supported by the evidence presented, but the evidence in favor of the memory strength theory was mixed.

Deficits in recent but not lifetime familiarity in amnestic mild cognitive impairment

People with amnestic mild cognitive impairment (aMCI) repeat questions, seemingly without any sense of familiarity (i.e., recognition of prior occurrence without recollection of episodic context). Accumulation of neurofibrillary tau in preclinical Alzheimer's disease begins in perirhinal cortex, a medial temporal lobe region linked to familiarity. Both observations would predict impaired familiarity assessment in aMCI; however, the extant evidence is mixed. To reveal familiarity impairments, it may be necessary to minimize the influence of recollection. In the current study, older adults with aMCI and healthy controls were administered two tasks on which a well-characterized patient (NB) with selective familiarity impairments due to surgical left temporal lobe excision sparing the hippocampus showed abnormal performance: frequency judgments for words exposed to in a recent study phase and judgments of cumulative lifetime familiarity for object concepts denoted by words. We also administered a process dissociation procedure (PDP) task that previously revealed spared familiarity in aMCI. We predicted that familiarity would be spared in aMCI on the PDP task, but impaired when assessed by frequency judgments for recent laboratory exposures and lifetime familiarity judgments. Familiarity was spared on the PDP task, but was impaired when probed with frequency judgments for recently exposed words in aMCI. Lifetime familiarity was also not impaired in aMCI. These results highlight the benefits of studying familiarity under conditions that minimize recollection and the value of frequency judgments in revealing familiarity deficits, and suggest that perirhinal cortex may not be necessary for accessing familiarity accumulated over a lifetime of experience.

The bounded rationality of probability distortion

In decision making under risk (DMR) participants' choices are based on probability values systematically different from those that are objectively correct. Similar systematic distortions are found in tasks involving relative frequency judgments (JRF). These distortions limit performance in a wide variety of tasks and an evident question is, Why do we systematically fail in our use of probability and relative frequency information? We propose a bounded log-odds model (BLO) of probability and relative frequency distortion based on three assumptions: 1) log-odds: probability and relative frequency are mapped to an internal log-odds scale, 2) boundedness: the range of representations of probability and relative frequency are bounded and the bounds change dynamically with task, and 3) variance compensation: the mapping compensates in part for uncertainty in probability and relative frequency values. We compared human performance in both DMR and JRF tasks to the predictions of the BLO model as well as 11 alternative models, each missing one or more of the underlying BLO assumptions (factorial model comparison). The BLO model and its assumptions proved to be superior to any of the alternatives. In a separate analysis, we found that BLO accounts for individual participants' data better than any previous model in the DMR literature. We also found that, subject to the boundedness limitation, participants' choice of distortion approximately maximized the mutual information between objective task-relevant values and internal values, a form of bounded rationality.

The frequency of cortical microstimulation shapes artificial touch

Intracortical microstimulation (ICMS) of the somatosensory cortex evokes vivid tactile sensations and can be used to convey sensory feedback from brain-controlled bionic hands. Changes in ICMS frequency lead to changes in the resulting sensation, but the discriminability of frequency has only been investigated over a narrow range of low frequencies. Furthermore, the sensory correlates of changes in ICMS frequency remain poorly understood. Specifically, it remains to be elucidated whether changes in frequency only modulate sensation magnitude-as do changes in amplitude-or whether they also modulate the quality of the sensation. To fill these gaps, we trained monkeys to discriminate the frequency of ICMS pulse trains over a wide range of frequencies (from 10 to 400 Hz). ICMS amplitude also varied across stimuli to dissociate sensation magnitude from ICMS frequency and ensure that animals could not make frequency judgments based on magnitude. We found that animals could consistently discriminate ICMS frequency up to ∼200 Hz but that the sensory correlates of frequency were highly electrode dependent: On some electrodes, changes in frequency were perceptually distinguishable from changes in amplitude-seemingly giving rise to a change in sensory quality; on others, they were not. We discuss the implications of our findings for neural coding and for brain-controlled bionic hands.

A Formal Solution to Reichenbach's Reference Class Problem

Following Reichenbach, it is widely held that in making a direct inference, one should base one’s conclusion on a relevant frequency statement concerning the most specific reference class for which one is able to make a warranted and relatively precise-valued frequency judgment. In cases where one has accurate and precise-valued frequency information for two relevant reference classes, R1 and R2, and one lacks accurate and precise-valued frequency information concerning their intersection, R1 intersect R2, it is widely held, following Reichenbach, that no inference may be drawn. In contradiction to Reichenbach and the common wisdom, I argue for the view that it is often possible to draw a reasonable informative conclusion, in such circumstances. As a basis for drawing such a conclusion, I show that one is generally in a position to formulate a reasonable direct inference for a reference class that is more specific than either of R1 and R2.

Late positive complex in event-related potentials tracks memory signals when they are decision relevant

The Late Positive Complex (LPC) is an Event-Related Potential (ERP) consistently observed in recognition-memory paradigms. In the present study, we investigated whether the LPC tracks the strength of multiple types of memory signals, and whether it does so in a decision dependent manner. For this purpose, we employed judgements of cumulative lifetime exposure to object concepts, and judgements of cumulative recent exposure (i.e., frequency judgements) in a study-test paradigm. A comparison of ERP signatures in relation to degree of prior exposure across the two memory tasks and the study phase revealed that the LPC tracks both types of memory signals, but only when they are relevant to the decision at hand. Another ERP component previously implicated in recognition memory, the FN400, showed a distinct pattern of activity across conditions that differed from the LPC; it tracked only recent exposure in a decision-dependent manner. Another similar ERP component typically linked to conceptual processing in past work, the N400, was sensitive to degree of recent and lifetime exposure, but it did not track them in a decision dependent manner. Finally, source localization analyses pointed to a potential source of the LPC in left ventral lateral parietal cortex, which also showed the decision-dependent effect. The current findings highlight the role of decision making in ERP markers of prior exposure in tasks other than those typically used in studies of recognition memory, and provides an initial link between the LPC and the previously suggested role of ventral lateral parietal cortex in memory judgements.

Influence of Average Cavity Dispersion and Spectral Bandwidth on Passively Harmonic Mode Locked L-Band Er-Doped Fiber Laser

We systematically study the impact of average cavity dispersion and pulse spectral bandwidth on harmonic mode locking in the long-wavelength band from an Er-doped fiber laser using carbon nanotubes polyvinyl alcohol (CNTs-PVA) film mode locker. By carrying out pulse energy management through optimizing the average cavity dispersion and optical spectral bandwidth, 2.08 GHz repetition rate corresponding to 201st harmonic with 36.5 dB side mode suppression ratio (SMSR) can be realized under 205 mW pump power at 1597.53 nm. Furthermore, we systematically investigate the characteristics of the harmonically mode locked ultrashort optical pulses with different spectral bandwidths versus pump power under fixed cavity dispersion first. Key laser parameters have been studied including pumping efficiency, duration, energy, SMSR, and time bandwidth product. Enlightened by the experimental results, a simple law on preliminary and fast judgment of pulses frequency under fixed pump power is proposed, namely, by monitoring the pulse spectral bandwidth. The laser source featuring high repetition rate and L-band operation is greatly sought-after in some specific applications such as modern optical communication system etc.