Secretory immunoglobulin A (sIgA) in saliva and cardiovascular activity were measured at rest and during mental arithmetic. Task difficulty was manipulated by presenting easy, hard, and impossible versions of the mental arithmetic task in counterbalanced order, while task novelty was operationalised as order of presentation (i.e. first, second, third). Mental arithmetic elicited significant inc...

A dual-task experiment was performed in order to test the assumption that speech disfluencies can result from interference between overt speech movements and concurrently performed cognitive processes. In a word-repetition task, sequences of three unrelated three-syllable nouns had to be repeated continuously. Under dual-task conditions, a mental addition task had to be performed concurrently. ...

In mental rotation, a mental representation of an object must be rotated while the actual object remains visible. Where is this representation stored while it is being rotated? To answer this question, observers were asked to perform a mental rotation task during the delay interval of a visual working memory task. When the working memory task required the storage of object features, substantial...

The standard psychometric scores show a fair degree of correlation with event-related evoked potential (ERP) latencies and amplitude. Since, both latency and amplitude are known to change during mental activity, it becomes important to consider both pre- and post-task ERP parameters is such correlative studies. In the present study, we have compared the psychometric scores obtained through WAIS...

Human walking involves coordinated movement between lower limbs. Locomotion is a neuromuscular activity and hence it is affected by mental tasks. Many studies on gait parameter e.g. stride length, gait speed, cadence and percentage of gait cycle in a double limb stance has been performed to determine the effect of a mental task on locomotive task. The knee being an important joint for locomotiv...

The objective of this study was to examine the differences in mental workload to computer-based tasks between men and women. Twelve female and twelve male students participated in the study. They performed a modified mirror tracing task and a mental arithmetic task. Mental workload was measured by physiological variables, subjective measurement and behavioral performance. Results suggested the ...

Human neuro-imaging studies have often reported co-activation of the dorsal premotor cortex (PMd) and the posterior parietal cortex (PPC) during internal operation of visuospatial information, referred to here as "visuospatial mental operation". However, the functions assigned to the PMd and PPC during these tasks are still unclear. Here, we examined the significance of these two areas for a vi...