Search results for "Stimuli"
showing 10 items of 123 documents
Coupling of Action-Perception Brain Networks during Musical Pulse Processing: Evidence from Region-of-Interest-Based Independent Component Analysis
2017
Our sense of rhythm relies on orchestrated activity of several cerebral and cerebellar structures. Although functional connectivity studies have advanced our understanding of rhythm perception, this phenomenon has not been sufficiently studied as a function of musical training and beyond the General Linear Model (GLM) approach. Here, we studied pulse clarity processing during naturalistic music listening using a data-driven approach (independent component analysis; ICA). Participants’ (18 musicians and 18 controls) functional magnetic resonance imaging (fMRI) responses were acquired while listening to music. A targeted region of interest (ROI) related to pulse clarity processing was defined…
Endothelial function and pathogenesis of endothelial dysfunction
2018
Background: The crucial role of endothelium is due to the ability of endothelial cells to receive and concurrently respond to humoral and hemodynamic stimuli. The mechanisms that mediate these reactions are: the production of endothelium-derived factors and metabolizing enzymes; the expression of binding proteins and adhesive molecules; and the consequential shape changes. In fact, a wide range of anti-atherosclerotic action substances is produced by the endothelial cells with the objective of maintaining the balance between vasoconstriction and vasodilation, and inhibit or stimulate the proliferation and migration of smooth muscle cells, thrombogenesis and fibrinolysis. Smoke, age, hyperch…
Acu kustību modelēšana horizontālās skenēšanas uzdevumos
2019
Bakalaura darbā tiek veikts pētījums par acu kustību analīzi, laiku kāda tiek atrasta noteikta informācija horizontālās skenēšanas uzdevumos un cik reizes pirms tam ir bijusi skatiena fiksācija. Darba mērķis noteikt vai izceltu stimulu meklēšana notiek ātrāk kā neizceltu stimulu. Darbā tika veikti eksperimenti ar 30 dalībniekiem, ar acu kustību analīzes iekārtu. Rezultāta netika novērotas lielas atšķirības starp izceltu un neizceltu stimulu meklēšanu, bet tika pamanīts, ka meklēšana notiek lēnāk un lielāks skaits ar neatrastiem stimuliem ir gadījumos, kad ir daudz nevajadzīgu citu stimulu attēlā, kas novērš uzmanību.
In praise of artifice reloaded: Caution with natural image databases in modeling vision
2019
Subjective image quality databases are a major source of raw data on how the visual system works in naturalistic environments. These databases describe the sensitivity of many observers to a wide range of distortions of different nature and intensity seen on top of a variety of natural images. Data of this kind seems to open a number of possibilities for the vision scientist to check the models in realistic scenarios. However, while these natural databases are great benchmarks for models developed in some other way (e.g., by using the well-controlled artificial stimuli of traditional psychophysics), they should be carefully used when trying to fit vision models. Given the high dimensionalit…
Altered processing of sensory stimuli in patients with migraine.
2014
Migraine is a cyclic disorder, in which functional and morphological brain changes fluctuate over time, culminating periodically in an attack. In the migrainous brain, temporal processing of external stimuli and sequential recruitment of neuronal networks are often dysfunctional. These changes reflect complex CNS dysfunction patterns. Assessment of multimodal evoked potentials and nociceptive reflex responses can reveal altered patterns of the brain's electrophysiological activity, thereby aiding our understanding of the pathophysiology of migraine. In this Review, we summarize the most important findings on temporal processing of evoked and reflex responses in migraine. Considering these d…
Implicit learning shapes new conscious percepts and representations
1997
We present here the lineaments of a new account of implicit learning, an account that does not rely on the notion of “implicit knowledge.” In this account, improved performance depends on the action of unconscious mechanisms that structure the phenomenal, conscious experience of the world. This integrative view makes groundless the search for dissociations between conscious and unconscious influences that has been at the core of the research on implicit learning and memory. We contrast this view, on the one hand, to Dienes and Berry’s (1997) proposal, which defines implicit learning by analogy with subliminal perception, and, on the other, to Neal and Hesketh’s (1997) episodic account, in w…
Pārdošanas personāla motivācija Latvijas darba tirgū
2016
Maģistra darbs „Pārdošanas personāla motivācija Latvijas darba tirgū” pēta aktuālu jautājumu par pārdošanas speciālistu motivēšanu Latvijas darba tirgū. Tā mērķis ir noskaidrot to, kādi stimuli vislabāk veicina pārdošanas speciālistu motivāciju un kā vadītājiem vislabāk iespējams šos stimulus īstenot savas nodaļas ikdienā. Darba gaitā tiek veikts pētījums, ar mērķi noskaidrot kādi ir labākie stimuli pārdevēju motivācijā un vai pārdošanas hierarhijas līmeņus motivē atšķirīgi motivācijas stimuli. Pētījumā tika pierādīts, ka labākie motivācijas stimuli pārdošanas nodaļas motivācijai ir laba darba alga, pārdošanas komisijas, interesants darbs, atzinība un iespēja attīstīt savas prasmes. Vienlai…
Personāla motivācijas pilnveidošanas iespējas uzņēmumā "Adidas Outlet".
2020
Bakalaura darba mērķis – pamatojoties uz motivācijas teorētiskiem aspektiem un aptaujas rezultātiem, izpētīt motivācijas sistēmu uzņēmumā Sportland, atklāt nepilnības un sniegt priekšlikumus motivācijas sistēmas pilnveidošanai. Bakalaura darbs sastāv no trim nodaļām – pirmajā sniegts ar motivāciju saistītu jautājumu skaidrojums, otrajā – novērtēta pētāmā uzņēmuma Sportland darbība, trešajā – apkopoti uzņēmuma Sportland darbinieku viedokļi par dažādiem motivējošiem un demotivējošiem faktoriem. Darba noslēgumā sniegti secinājumi un priekšlikumi uzņēmuma Sportland īstenotās motivācijas sistēmas kontekstā. Darbs sastāv no 61 lppaspuses., tajā ir 7 tabulas, 14 attēli un tas satur 3 pielikumus.
Does Holistic Processing Require a Large Brain? Insights From Honeybees and Wasps in Fine Visual Recognition Tasks.
2018
The expertise of humans for recognizing faces is largely based on holistic processing mechanism, a sophisticated cognitive process that develops with visual experience. The various visual features of a face are thus glued together and treated by the brain as a unique stimulus, facilitating robust recognition. Holistic processing is known to facilitate fine discrimination of highly similar visual stimuli, and involves specialized brain areas in humans and other primates. Although holistic processing is most typically employed with face stimuli, subjects can also learn to apply similar image analysis mechanisms when gaining expertise in discriminating novel visual objects, like becoming exper…
Human Reaction Times: Linking Individual and Collective Behaviour Through Physics Modeling
2021
An individual’s reaction time data to visual stimuli have usually been represented in Experimental Psychology by means of an ex-Gaussian function. In most previous works, researchers have mainly aimed at finding a meaning for the parameters of the ex-Gaussian function which are known to correlate with cognitive disorders. Based on the recent evidence of correlations between the reaction time series to visual stimuli produced by different individuals within a group, we go beyond and propose a Physics-inspired model to represent the reaction time data of a coetaneous group of individuals. In doing so, a Maxwell–Boltzmann-like distribution appeared, the same distribution as for the velocities …