Sandra I. Sünram-Lea
Lancaster University
Developmental psychologyPsychologyCognitionCognitive psychologyEffects of sleep deprivation on cognitive performance
What is this?
Publications 38
#1Sandra I. Sünram-Lea (Lancaster University)H-Index: 14
#2Lauren Owen (UCLan: University of Central Lancashire)H-Index: 13
The brain has a high metabolic rate and its metabolism is almost entirely restricted to oxidative utilisation of glucose. These factors emphasise the extreme dependence of neural tissue on a stable and adequate supply of glucose. Whereas initially it was thought that only glucose deprivation (i.e. under hypoglycaemic conditions) can affect brain function, it has become apparent that low-level fluctuations in central availability can affect neural and consequently, cognitive performance. In the p...
5 CitationsSource
#1Claire L. Kelly (Lancaster University)H-Index: 2
#2Trevor J. Crawford (Lancaster University)H-Index: 32
Last. Sandra I. Sünram-Lea (Lancaster University)H-Index: 14
view all 5 authors...
Self-control is important for everyday life and involves behavioral regulation. Self-control requires effort, and when completing two successive self-control tasks, there is typically a temporary drop in performance in the second task. High self-reported motivation and being made self-aware somewhat counteract this effect-with the result that performance in the second task is enhanced. The current study explored the relationship between self-awareness and motivation on sequential self-control ta...
2 CitationsSource
#1Claire L. Kelly (Fylde College, Lancaster University)H-Index: 2
#2Sandra I. Sünram-Lea (Fylde College, Lancaster University)H-Index: 14
Last. Trevor J. Crawford (Fylde College, Lancaster University)H-Index: 32
view all 3 authors...
Research shows that self-control is resource limited and there is a gradual weakening in consecutive self-control task performance akin to muscle fatigue. A body of evidence suggests that the resource is glucose and consuming glucose reduces this effect. This study examined the effect of glucose on performance in the antisaccade task - which requires self-control through generating a voluntary eye movement away from a target - following self-control exertion in the Stroop task. The effects of mo...
8 CitationsSource
#1Helen Macpherson (Swinburne University of Technology)H-Index: 14
#2Bernadette Roberstson (Lancaster University)H-Index: 1
Last. Andrew Scholey (Swinburne University of Technology)H-Index: 56
view all 6 authors...
Rationale Current research suggests that glucose facilitates performance on cognitive tasks which possess an episodic memory component and a relatively high level of cognitive demand. However, the extent to which this glucose facilitation effect is uniform across the lifespan is uncertain.
7 CitationsSource
#1Sarita Jane Robinson (UCLan: University of Central Lancashire)H-Index: 10
#2John LeachH-Index: 9
Last. Sandra I. Sünram-Lea (Lancaster University)H-Index: 14
view all 4 authors...
Background: During emergencies maladaptive behavior can reduce survival. This study compared the effects of a basic firefighter training course on 21 volunteers (with no firefighting experience) with age and gender-matched controls. Methods: Stress reactivity (salivary cortisol and anxiety) were monitored across the course: day 1 (classroom), day 2 (physical equipment training), and day 3 (simulated fire emergency). Cognitive performance (visual attention, declarative and working memory) conside...
22 CitationsSource
#1Lauren Owen (Swinburne University of Technology)H-Index: 13
#2Sandra I. Sünram-Lea (Lancaster University)H-Index: 14
Over the past four or five decades, there has been increasing interest in the neurochemical regulation of cognition. This field received considerable attention in the 1980s, with the identification of possible cognition enhancing agents or “smart drugs”. Even though many of the optimistic claims for some agents have proven premature, evidence suggests that several metabolic agents may prove to be effective in improving and preserving cognitive performance and may lead to better cognitive aging t...
64 CitationsSource
#1Sandra I. Sünram-Lea (Lancaster University)H-Index: 14
#2Lauren Owen (Swinburne University of Technology)H-Index: 13
Last. Henglong HuH-Index: 4
view all 4 authors...
It has been suggested that the memory enhancing effect of glucose follows an inverted U-shaped curve, with 25 g resulting in optimal facilitation in healthy young adults. The aim of this study was to further investigate the dose dependency of the glucose facilitation effect in this population across different memory domains and to assess moderation by interindividual differences in glucose regulation and weight. Following a double-blind, repeated measures design, 30 participants were administere...
32 CitationsSource
#1Karen R. Brandt (University of Roehampton)H-Index: 13
#2Sandra I. Sünram-Lea (Lancaster University)H-Index: 14
Last. Emma Jones (Northumbria University)H-Index: 6
view all 4 authors...
Whilst previous research has shown that glucose administration can boost memory performance, research investigating the effects of glucose on memory for emotional material has produced mixed findings. Whereas some research has shown that glucose impairs memory for emotional material, other research has shown that glucose has no effect on emotional items. The aim of the present research was therefore to provide further investigation of the role of glucose on the recognition of words with emotiona...
9 CitationsSource
#1Lauren OwenH-Index: 13
#2Yvonne E. FinneganH-Index: 11
Last. Sandra I. Sünram-Lea (Lancaster University)H-Index: 14
view all 5 authors...
Rational Previous research has suggested that long-term verbal declarative memory is particularly sensitive to enhancement by glucose loading; however, investigation of glucose effects on certain memory domains has hitherto been neglected. Therefore, domain specificity of glucose effects merits further elucidation.
16 CitationsSource
#1Andrew Scholey (Swinburne University of Technology)H-Index: 56
#2Sandra I. Sünram-Lea (Lancaster University)H-Index: 14
Last. David O. Kennedy (Northumbria University)H-Index: 46
view all 5 authors...
This double-blind, placebo-controlled study examined the influence of appetitive state on glucose enhancement of memory. Participants rated their mood, hunger and thirst, then consumed a 25 g glucose drink or a matched placebo 20 min prior to a verbal memory task. There was a double dissociation when the effects of thirst ratings and drink on subsequent memory performance were considered. Those who were initially less thirsty recalled significantly more words following glucose than placebo; thos...
12 CitationsSource