Patrick Khader

Patrick Khader
University of Applied Science Fresenius · Psychology School

PD Dr.

About

32
Publications
5,661
Reads
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1,059
Citations
Additional affiliations
January 2016 - present
Philipps University of Marburg
Position
  • Consultant (for Evaluation)
October 2015 - December 2015
Max Planck Institute for Human Development
Position
  • Visiting Researcher
October 2014 - September 2015
Ludwig-Maximilians-University of Munich
Position
  • (Temp.) Professor of General Psychology

Publications

Publications (32)
Article
Full-text available
It has been proposed that the deployment of selective attention to perceptual and memory representations might be governed by similar cognitive processes and neural resources. However, evidence for this simple and appealing proposal remains inconclusive, which might be due to a considerable divergence in tasks and cognitive demands when comparing a...
Article
Higher cognitive functions are the product of a dynamic interplay of perceptual, mnemonic, and other cognitive processes. Modeling such interplaying processes and generating predictions about both behavioral and neural data can be achieved with cognitive architectures. However, such architectures are still relatively rarely used, likely because wor...
Article
Repeated encounter of abstract target-distractor letter arrangements leads to improved visual search for such displays. This contextual-cueing effect is attributed to incidental learning of display configurations. Whether observers can consciously access the memory underlying the cueing effect is still a controversial issue. The current study uses...
Article
Full-text available
Background Physical exercise has been shown to improve cognitive and neural functioning in older adults. Aims and methodsThe current study compared the effects of an acute bout of physical exercise with a bout of interactive mental and physical exercise (i.e., “exergaming”) on executive (Stroop) task performance and event-related potential (ERP) am...
Article
Full-text available
How are images that have been assembled from their constituting elements maintained as a coherent representation in visual working memory (vWM)? Here, we compared two conditions of vWM maintenance that only differed in how vWM contents had been created. Participants maintained images that they either had to assemble from single features or that the...
Article
Objectives: Previous studies have shown that anodal transcranial direct current stimulation (tDCS) of the left dorsolateral prefrontal cortex (DLPFC) led to an improvement of various cognitive functions in patients with Alzheimer dementia, early affected by short-term memory deficits. Since this approach has not been evaluated in the context of va...
Article
Decision-making often requires retrieval from memory. Drawing on the neural ACT-R theory [Anderson, J. R., Fincham, J. M., Qin, Y., & Stocco, A. A central circuit of the mind. Trends in Cognitive Sciences, 12, 136-143, 2008] and other neural models of memory, we delineated the neural signatures of two fundamental retrieval aspects during decision-m...
Article
The attention to memory theory (AtoM) proposes that the same brain regions might be involved in selective processing of perceived stimuli (selective attention) and memory representations (selective retrieval). Although this idea is compelling, given consistently found neural overlap between perceiving and remembering stimuli, recent comparisons bro...
Article
How do we control the successive retrieval of behaviorally relevant information from long-term memory (LTM) without being distracted by other potential retrieval targets associated to the same retrieval cues? Here, we approach this question by investigating the nature of trial-by-trial dynamics of selective LTM retrieval, i.e., in how far retrieval...
Article
Full-text available
A central question concerning word recognition is whether linguistic categories are processed in continuous or categorical ways, in particular, whether regular and irregular inflection is stored and processed by the same or by distinct systems. Here, we contribute to this issue by contrasting regular (regular stem, regular suffix) with semi-irregul...
Article
In memory-based decision making, people often rely on simple heuristics such as take-the-best (TTB; Gigerenzer & Goldstein, Psychological Review, 103, 650-669, 1996), which processes information about the alternatives sequentially and stops processing as soon as a decision can be made. In this article, we examine the memory processes associated wit...
Article
Previous studies have shown that non-invasive stimulation of the dorsolateral prefrontal cortex (DLPFC) could modulate experimentally induced pain and working memory (WM) in healthy subjects. However, the two aspects have never been assessed concomitantly. The present study was set up to investigate the effects of transcranial direct current stimul...
Article
Full-text available
Remembering is more than an activation of a memory trace. As retrieval cues are often not uniquely related to one specific memory, cognitive control should come into play to guide selective memory retrieval by focusing on relevant while ignoring irrelevant information. Here, we investigated, by means of EEG and fMRI, how the memory system deals wit...
Article
In our daily life, we often need to selectively remember information related to the same retrieval cue in a consecutive manner (e.g., ingredients from a recipe). To investigate such selection processes during cued long-term memory (LTM) retrieval, we used a paradigm in which the retrieval demands were systematically varied from trial to trial and a...
Article
Full-text available
Many of our daily decisions are memory based, that is, the attribute information about the decision alternatives has to be recalled. Behavioral studies suggest that for such decisions we often use simple strategies (heuristics) that rely on controlled and limited information search. It is assumed that these heuristics simplify decision-making by ac...
Article
The roles of theta and alpha oscillations for long-term memory (LTM) retrieval are still under debate. Both are modulated by LTM retrieval demands, but it is unclear what specific LTM functions they are related to. Here, different oscillatory correlates of LTM retrieval could be obtained for theta and alpha with a paradigm that is suited to monitor...
Article
The goal of the present study was to investigate the neuroanatomical basis of arithmetic fact retrieval. The rationale was that areas playing a crucial role in arithmetic fact retrieval should show a systematic increase of activation with increasing retrieval effort. To achieve this goal, we utilized the problem-size effect as this is known to be s...
Article
The neural basis underlying the generation of nouns and verbs is still not completely understood. In classical generation tasks, specific features of the produced words can hardly be controlled. Therefore, the observed neural correlates of noun and verb production cannot be directly related to differences in specific features of the generated words...
Article
To date, much is known about the neural mechanisms underlying working-memory (WM) maintenance and long-term-memory (LTM) encoding. However, these topics have typically been examined in isolation, and little is known about how these processes might interact. Here, we investigated whether EEG oscillations arising specifically during the delay of a de...
Article
The present study investigated the neuroanatomical basis of different solution processes in single-digit multiplication by means of fMRI. Sixteen participants silently produced the solution of three distinct types of multiplication, i.e., problems involving zero (e.g., 3*0), small (e.g., 2*4), or large operands (e.g., 8*7). Zero and small problems...
Chapter
This chapter examines behavioural, neurophysiological, and neuroimaging studies that reveal dissociations between storage or retrieval of clearly distinct, global stimulus categories, less distinct stimulus categories, and fine-grained distinctions within object categories. These results clearly show that material-specific cortical networks exist w...
Article
This review summarizes experimental studies that investigated the relationship between DC-recorded slow event-related potentials (slow waves) of the electroencephalogram (EEG) and the hemodynamic BOLD response, as measured with functional magnetic resonance imaging (fMRI). Slow waves have been found to accompany a large number of cognitive processe...
Article
Full-text available
Behavioral research has led to conflicting views regarding the relationship between working memory (WM) maintenance and long-term memory (LTM) formation. We used slow event-related brain potentials to investigate the degree to which neural activity during WM maintenance is associated with successful LTM formation. Participants performed a WM task w...
Article
Full-text available
The present study investigated the neurophysiological processes underlying associative long-term memory retrieval of objects and spatial positions by means of a modified fan paradigm with cued recall and two neuroimaging methods (electroencephalogram [EEG] and functional magnetic resonance imaging). In an acquisition phase, either one stimulus or t...
Article
We tested whether visual stimulus material that is assumed to be processed in different cortical networks during perception (i.e., faces and spatial positions) is also topographically dissociable during long-term memory recall. With an extensive overlearning procedure, 12 participants learned paired associates of words and faces and words and spati...
Article
Motivated by models that propose material-specific cortical long-term memory representations we expected different topographies of event-related slow waves of the EEG during cued retrieval of two distinct types of information (faces and spatial positions), which are assumed to be processed and stored in topographically distinct cortical areas, i.e....
Article
Spectral power and coherence of the electroencephalogram was measured while subjects read either a verb or a noun which initiated a short meaningful phrase. For both types of words theta-power decreased substantially relative to a prestimulus baseline at left anterior electrode sites. All other frequency bands showed less (alpha, beta) or no effect...
Article
The aim of the present study was to enforce the priming of either nouns or verbs in order to evoke word-category-specific N400 effects. In two experiments two primes which were either a verb-noun or a noun-noun pair were followed by a semantically related or unrelated target which was a noun or verb, respectively. This target always completed the w...

Projects

Projects (2)
Project
This project aims to describe strategies that simplify the decision making process (e.g., by limiting information search) and to understand the conditions under which people select these strategies to make decisions. A further goal is to identify how these heuristics are implemented in the cognitive system (e.g., which memory and executive functions are involved) and to elaborate the ecological properties under which the heuristics enable good decisions.