scholarly journals Location specificity in response selection processes for visual stimuli

2005 ◽  
Vol 12 (3) ◽  
pp. 541-548 ◽  
Author(s):  
Hagit Magen ◽  
Asher Cohen
Keyword(s):  
Response Selection ◽  
Visual Stimuli ◽  
Selection Processes

Functional Locus of Intensity Effects in Choice Reaction Time Tasks

2009 ◽  
Vol 23 (3) ◽  
pp. 126-134 ◽  
Author(s):  
Piotr Jaśkowski ◽  
Izabela Szumska ◽  
Edyta Sasin
Keyword(s):  
Reaction Time ◽  
Evoked Potentials ◽  
Response Selection ◽  
Visual Stimuli ◽  
Reaction Times ◽  
Auditory Stimuli ◽  
Response Choice ◽  
Selection Processes ◽  
Functional Locus ◽  
Readiness Potentials

Long reaction times (RT) paradoxically occur with extremely loud auditory stimuli ( Van der Molen & Keuss, 1979 , 1981 ) or with ultrabright and large visual stimuli ( Jaśkowski & Włodarczyk, 2006 ) when the task requires a response choice. Van der Molen and Keuss (1981 ) hypothesized that this effect results from an arousal-driven elongation of response-selection processes. We tested this hypothesis using visual stimuli and chronopsychophysiological markers. The results showed that the latency of both early (P1 recorded at Oz) and late (P300) evoked potentials decreased monotonically with intensity. In contrast, the latency of stimulus-locked lateralized readiness potentials (LRP) abruptly increased for the most intense stimuli, thus mirroring the reaction time–intensity relationship. Response-locked LRPs revealed no dependency on intensity. These findings suggest that the processes responsible for the van der Molen-Keuss effect influence processing stages that are completed before the onset of LRP. The van der Molen-Keuss effect likely occurs later than those represented by early sensory potentials. This is in keeping with the hypothesis of van der Molen-Keuss.

Perceptual Dimensional Constraints in Response Selection Processes

1997 ◽  
Vol 32 (2) ◽  
pp. 128-181 ◽  
Author(s):  
Asher Cohen ◽  
Rachel Shoup
Keyword(s):  
Response Selection ◽  
Selection Processes

Response-Selection-Related Parietal Activation during Number Comparison

2004 ◽  
Vol 16 (9) ◽  
pp. 1536-1551 ◽  
Author(s):  
Silke M. Göbel ◽  
Heidi Johansen-Berg ◽  
Tim Behrens ◽  
Matthew F. S. Rushworth
Keyword(s):  
Nonhuman Primates ◽  
Response Selection ◽  
Perceptual Task ◽  
Numerical Distance ◽  
Single Digit ◽  
Selection Processes ◽  
Number Comparison ◽  
Basic Stimulus ◽  
The Right ◽  
Double Digit

Neuroimaging studies of number comparison have consistently found activation in the intraparietal sulcus (IPS). Recently, it has been suggested that activations in the IPS vary with the distance between the numbers being compared. In number comparison, the smaller the distance between a number and the reference the longer the reaction time (RT). Activations in the right or left IPS, however, have also been related to attentional and intentional selection. It is possible, therefore, that activity in this region is a reflection of the more basic stimulus and response-selection processes associated with changes in RT. This fMRI experiment investigated the effect of numerical distance independently from RT. In addition, activations during number comparison of single-digit and double-digit stimuli were compared. During number comparison blocks, subjects had to indicate whether digits were greater or smaller than a reference (5 or 65). In control blocks, they were asked to perform a perceptual task (vertical line present/absent) on either numerical or nonnumerical stimuli. Number comparison versus rest yielded a large bilateral parietal-posterior frontal network. However, no areas showed more activation during number comparison than during the control tasks. Furthermore, no areas were more active during comparison of numbers separated by a small distance than comparisons of those separated by a large distance or vice versa. A left-lateralized parietal-posterior frontal network varied significantly with RT. Our findings suggest that magnitude and numerical-distance-related IPS activations might be difficult to separate from fundamental stimulus and response-selection processes associated with RT changes. As is the case with other parameters, such as space, magnitude may be represented in the context of response selection in the parietal cortex. In this respect, the representation of magnitude in the human IPS may be similar to the representation of magnitude in other nonhuman primates.

scholarly journals Striatal and thalamic GABA level concentrations play differential roles for the modulation of response selection processes by proprioceptive information

NeuroImage ◽  
2015 ◽  
Vol 120 ◽  
pp. 36-42 ◽  
Author(s):  
Shalmali Dharmadhikari ◽  
Ruoyun Ma ◽  
Chien-Lin Yeh ◽  
Ann-Kathrin Stock ◽  
Sandy Snyder ◽  
...  
Keyword(s):  
Response Selection ◽  
Proprioceptive Information ◽  
Gaba Level ◽  
Selection Processes

Accessory Stimuli Affect the Emergence of Conflict, Not Conflict Control

2011 ◽  
Vol 58 (2) ◽  
pp. 102-109 ◽  
Author(s):  
Anne Böckler ◽  
Gamze Alpay ◽  
Birgit Stürmer
Keyword(s):  
Response Selection ◽  
Simon Task ◽  
Conflict Adaptation ◽  
Executive Attention ◽  
Response Preparation ◽  
Direct Response ◽  
Indirect Response ◽  
Selection Processes ◽  
Dual Route ◽  
Stimulus Classification

Accessory signals that precede stimuli in interference tasks lead to faster overall responses while conflict increases. Two opposing accounts exist for the latter finding: one is based on dual-route frameworks of response preparation and proposes amplification of both direct response activation and indirect response selection processes; the other refers to attentional networks and suggests inhibition of executive attention, thereby hampering conflict control. The present study replicated previous behavioral findings in a Simon task and extended them by electrophysiological evidence. Accessory tones facilitated stimulus classification and attentional allocation in the Simon task as reflected by an increased N1 amplitude and an overall decrease of the N2 amplitude, respectively. The conflict-related N2 amplitude, which is larger in conflict trials compared with nonconflict trials, was not modulated by accessory tones. Moreover, accessory tones did not affect sequence-dependent conflict adaptation. In terms of a dual-route framework present results suggest amplification of both response preparation routes by accessory stimuli. An executive attention approach proposing accessory stimuli to hamper control of conflict is not supported.

Concurrent response-selection processes in dual-task performance: Evidence for adaptive executive control of task scheduling.

1999 ◽  
Vol 25 (3) ◽  
pp. 791-814 ◽  
Author(s):  
Eric H. Schumacher ◽  
Erick J. Lauber ◽  
Jennifer M. Glass ◽  
Eileen L. Zurbriggen ◽  
Leon Gmeindl ◽  
...  
Keyword(s):  
Task Performance ◽  
Task Scheduling ◽  
Executive Control ◽  
Dual Task ◽  
Response Selection ◽  
Selection Processes ◽  
Dual Task Performance
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