Declarative Memory

Total Page:16

File Type:pdf, Size:1020Kb

Declarative Memory استمارة تقييم الرسائل البحثية ملقر ر دراس ي اوﻻ : بيانات تمﻷ بمعرفة الطالب اسم الطالب : مريم احمد عثمان عبدالحميد كلية : اﻵداب الفرقة/املستو ى : ا ﻷولى الشعبة : علم نفس اسم املقرر : نصوص نفسية بلغة اوربية كود املقرر: .. استاذ املقر ر : ا د ./ هبة ابراهيم القشقيشي البريد اﻻلكترونى للطالب : [email protected] عنوان الرسالة البحثية : Types of memory ثانيا: بيانات تمﻷ بمعرفة لجنة املمتحنيين هل الرسالة البحثية املقدمة متشابة جزئيا او كليا ☐ نعم ☐ ﻻ فى حالة اﻻجابة بنعم ﻻ يتم تقييم املشروع البحثى ويعتبر غير مجاز تقييم املشروع البحث ى م عناصر التقييم الوزن التقييم النسبى 1 الشكل العام للرسالة البحثية 2 تحقق املتطلبات العلمية املطلوبة 3 يذكر املراجع واملصادر العلمية 4 الصياغة اللغوية واسلوب الكتابة جيد نتيجة التقييم النهائى /100 ☐ ناجح ☐ راس ب توقيع لجنة التقييم 1. .2 .3 .4 .5 ترفق هذه اﻻ ستمارة كغﻻف للمشروع البحثى بعد استكمال البيانان بمعرفة الطالب وعلى ان ﻻ تزيد عن صفحة واحد ة The introduction What we usually think of as “memory” in day-to-day usage is actually long-term memory, but there are also important short-term and sensory memory processes, which must be worked through before a long-term memory can be established. The different types of memory each have their own particular mode of operation, but they all cooperate in the process of memorization and can be seen as three necessary steps in forming a lasting memory. Types of memory Sensory memory Ensory memory is our shortest form of memory. It's very fleeting - no more than a flash. Sensory memory acts as a buffer for stimuli received through the five senses. These images are accurately retained, but only for a brief moment in time, typically less than half a second. Have you ever waved a sparkler in the air and seen a trail of light behind it? That's sensory memory: an image, a scent, a sound. Just as it sounds, sensory memory works with our senses to recall some quick flash of information. There are three main subcategories of sensory memory. Let's take a look. Iconic memory This refers to immediate visual memories. Iconic memory is also very, very fleeting. It's how the brain remembers an image you just saw moments ago. Say something flashed on your computer screen for less than a second. Your brain will "remember" what it saw very briefly, even after the image is gone. Beyond the second mark, anything you "remember" goes on to short-term memory. Echoic memory Sometimes referred to as auditory sensory memory, echoic memory pertains to audio memories. Overall, echoic memories are stored slightly longer than iconic memories: about four seconds. If you hear a few notes of a melody, you may able to hum it back immediately after it finishes. However, if you were asked for the melody again in a few minutes, you may be unable to remember it unless it transferred to short-term memory. Haptic memory This refers to memories involving the sense of touch. Just like with iconic and echoic memory, haptic memory is equally fleeting. If you run your hand over a rough surface, you'll remember the exact sensation you felt for a few seconds. After that, the memory needs to be encoded into short-term memory for later recall. Other sensory memories What about the other two senses: olfactory (smell) and gustatory (taste)? Even though we often hear that our sense of smell is our strongest link to the past, ironically, the above three subcategories are more extensively studied in the context of sensory memory. Whether you're dealing with sight, smell, or taste, remember that sensory memories are fleeting. They're nothing more than a flash - a flash of a sparkler or an image flitting across your screen. If you're looking for tips and tricks to boost your recall, check out how to improve your memory. Short-term memory Short-term memories are slightly less passing than sensory memories, but they still get dismissed after a few minutes. The label is quite apt, given their function. Short-term memory is the part of our brains that holds onto information until we need to recall it. If we make mental lists before we run to target, it's our short-term memory that will help us recall the fabric softener or the folding chair. Short-term memory, often interchanged with the term "working memory," is very temporary. It has a low capacity, as the information being processed will either be quickly dismissed, or entered into our long-term memory bank. It's sort of the precursor to long-term memory, which has many distinct facets with varied functionality. This is the reason why you might continually repeat a phone number as you walk toward your phone; you're keeping the number in your short-term memory. Short-term memory example Lilly parked in the garage on main street. In order to pay for parking, she had to remember her parking space number as she walked over to put money in the meter. Once she got the ticket, she placed it on her windshield and walked across the street to meet her friends for dinner. If you'd asked her what her parking space number was halfway through dessert, she might not be able to tell you. Long-term memory Long-term memory is the brain's system for storing, managing, and recalling information. It is very complex with different functionality. As sensory memories only flicker for less than a second and short-term memories last only a minute or two, long- term memories include anything from an event that occurred five minutes ago to something from years ago. There are many different forms of long-term memories. Sometimes they're conscious, requiring us to actively think in order to recall a piece of information. Other times they're unconscious, simply appearing without an active attempt at recollection, like remembering the route from home to work without actively thinking about it. Let's take a look at some of the most prevalent forms of long-term memory. Explicit memory Sometimes referred to as conscious memory, this is the intentional recall of information. For example: every time katie fills out a college application, she must consciously recall her full address, telephone number, and social security number. Declarative memory A variant of explicit memory, this involves the retention and recall of important facts, such as dates, events, and information. For example: as august rolls around, katie knows it's time to buy a birthday card for her best friend sara. August th is sara's birthday. Episodic memory A form of declarative memory, this includes an ability to remember firsthand experiences from your life. For example: katie's mom calls to ask what she did over the weekend. Katie must think back and recall saturday's frisbee tournament, plus the church meeting she attended on sunday, in order to tell her mother about them. Semantic memory Also a form of declarative memory, semantic memory refers to the memory's storage of vocabulary, key facts, names, and general knowledge. For example: katie's mom loves the ny giants, but she can never remember the quarterback's name. Julie constantly has to remind her that his name is eli manning. Implicit memory Sometimes referred to as "unconscious memory," implicit memory includes the retention of information from a moment in time that can't specifically be recalled. You know how some things just "ring a bell"? For example: sasha's parents took her on a family vacation to the jersey shore when she was eight years old. Much later, during spring break in college, sasha returned to the jersey shore with her sorority sisters and remembered exactly how to get to the boardwalk. Procedural memory A form of implicit memory, procedural memory is the ability to recall how to do things, from riding a bike to driving a car. For example: sasha used to get in her car and run through a series of safety checks before driving. Are her mirrors properly positioned? Is her seat belt fastened? Now, she just gets in and performs those routine checks automatically without even thinking about them. Auditory memory Auditory memory helps us retain information based on the sounds we hear. When a child is learning about the sounds letters make, it's their auditory memory that will allow them to remember that the letter "b" makes the sound we hear in the word "ball." So, as a child learns his letters, there might be one page in the book that shows the letter b. The parent or teacher will model the sound the letter makes. Then, on the next page, they might find the word "ball." in order for the child to be successful, he'll have to remember the "b" sound from the previous page. Visual-spatial memory Meanwhile, visual-spatial memory is what will help the child associate a picture of a basketball with the word "ball." a child's ability to label that round, orange object as a basketball will rely upon the visual cues they've been given. It's all in the mind Isn't the mind a fabulous study? It serves so many functions. It works as a receptionist in the form of sensory memory, admitting flashes into the mind. It acts as judge and jury, deciding which facts enter and exit quickly through the short-term memory bank, or advance into long-term memory. The mind stores information for us to reach in and grab, whether we intentionally put it there or don't even realize it's sitting there.
Recommended publications
  • Cognitive Psychology
    COGNITIVE PSYCHOLOGY PSYCH 126 Acknowledgements College of the Canyons would like to extend appreciation to the following people and organizations for allowing this textbook to be created: California Community Colleges Chancellor’s Office Chancellor Diane Van Hook Santa Clarita Community College District College of the Canyons Distance Learning Office In providing content for this textbook, the following professionals were invaluable: Mehgan Andrade, who was the major contributor and compiler of this work and Neil Walker, without whose help the book could not have been completed. Special Thank You to Trudi Radtke for editing, formatting, readability, and aesthetics. The contents of this textbook were developed under the Title V grant from the Department of Education (Award #P031S140092). However, those contents do not necessarily represent the policy of the Department of Education, and you should not assume endorsement by the Federal Government. Unless otherwise noted, the content in this textbook is licensed under CC BY 4.0 Table of Contents Psychology .................................................................................................................................................... 1 126 ................................................................................................................................................................ 1 Chapter 1 - History of Cognitive Psychology ............................................................................................. 7 Definition of Cognitive Psychology
    [Show full text]
  • Sleep's Role on Episodic Memory Consolidation
    SLEEP ’S ROLE ON EPISODIC MEMORY CONSOLIDATION IN ADULTS AND CHILDREN Dissertation zur Erlangung des Grades eines Doktors der Naturwissenschaften der Mathematisch-Naturwissenschaftlichen Fakultät und der Medizinischen Fakultät der Eberhard-Karls-Universität Tübingen vorgelegt von Jing-Yi Wang aus Shijiazhuang, Hebei, Volksrepublik China Dezember, 2016 Tag der mündlichen Prüfung: February 22 , 2017 Dekan der Math.-Nat. Fakultät: Prof. Dr. W. Rosenstiel Dekan der Medizinischen Fakultät: Prof. Dr. I. B. Autenrieth 1. Berichterstatter: Prof. Dr. Jan Born 2. Berichterstatter: Prof. Dr. Steffen Gais Prüfungskommission: Prof. Manfred Hallschmid Prof. Dr. Steffen Gais Prof. Christoph Braun Prof. Caterina Gawrilow I Declaration: I hereby declare that I have produced the work entitled “Sleep’s Role on Episodic Memory Consolidation in Adults and Children”, submitted for the award of a doctorate, on my own (without external help), have used only the sources and aids indicated and have marked passages included from other works, whether verbatim or in content, as such. I swear upon oath that these statements are true and that I have not concealed anything. I am aware that making a false declaration under oath is punishable by a term of imprisonment of up to three years or by a fine. Tübingen, the December 5, 2016 ........................................................ Date Signature III To my beloved parents – Hui Jiao and Xuewei Wang, Grandfather – Jin Wang, and Frederik D. Weber 致我的父母:焦惠和王学伟 爷爷王金,以及 爱人王敬德 V Content Abbreviations ...................................................................................................................................................
    [Show full text]
  • Atkinson- Shiffrin Model of Memory Multi Store Model of Human Memory
    Atkinson- Shiffrin Model of Memory Multi Store Model of Human Memory • In 1968 Atkinson and Shiffrin proposed a model of human memory which posited two distinct memory stores: short-term memory, and long-term memory. • Later a third memory store (actually the first in sequence) was added: sensory memory. • Information enters the human information processing system via a variety of channels associated with the different senses. Sensory Memory • Information not immediately attended to is held briefly in a very temporary "buffer" memory, making it possible to attend to some of it a bit later. • This buffer memory is called sensory memory. There is a sensory memory for vision, called iconic memory One for audition (hearing), called echoic memory. • And one for touch- haptic memory Iconic Memory (vision) Echoic Memory (hearing) Capacity: Essentially Capacity: ???? that of the visual Duration: About 3-4 system seconds Duration: About 0.3 Processing: None to 1.0 seconds additional beyond raw Processing: None perceptual processing additional beyond raw perceptual processing • Haptic memory is a form of sensory memory that refers to the recollection of data acquired by touch after a stimulus has been presented. Similar to visual iconic memory, traces of haptically acquired information are short lived and prone to decay after approximately two seconds. Short Term Memory Information that is attended to arrives in another temporary store called short-term or working memory. Some properties of STM: • Capacity: About 7 plus or minus 2 "chunks" of information. • Duration: About 18-20 seconds (average). • Processing: To hold information in STM, it is often encoded verbally, although other strategies may also be used such as visualisation.
    [Show full text]
  • The Role of the Parietal Operculum
    Haptic-based object directed behavior: the role of the parietal operculum. Student: Francesca Maule Advisor: Dott. Luigi Cattaneo A thesis submitted for the degree of Philosophiæ Doctor (PhD) Doctoral school in Cognitive and Brain Sciences XXVI cycle December 2013 II Abstract The aim of this thesis is to provide new insights about the role of the left human parietal operculum (OP) in sensory motor transformations in the context of object-directed behavior. This work is divided in two main parts: and introductive part about the theory underlying the sensory motor integration and the existing literature about the parietal operculum, and an experimental part in which the experiments realized during these three years are described. In Chapter 1, the theory underlying the sensory motor transformation in the visual modality and the possible functions of the different front- parietal circuits are described on the basis of the theory proposed in the literature. A specific paragraph is dedicated to ventral premotor cortex (PMv) and its role in visually guided grasping. The Chapter 2, is a review of the literature about the cytoarchitecture, the connectivity and the physiology of humans and non- human primates parietal operculum. In Chapter 3 the literature about the role of OP of primates and humans in sensory motor integration is reviewed together with some literature about studies on lesions. In the experimental part, four transcranial magnetic stimulation (TMS) experiments are described. The last two experiments have been grouped in a single major work and results have been discussed together. In Chapter 4 the Experiment I is described. This experiment aimed to characterize the fronto-parietal network involving the connection between left OP and ipsilateral primary motor cortex (M1).
    [Show full text]
  • Memory in the Cortex of the Primate
    Biol Res 28: 59-72 (1995) 59 Memory in the cortex of the primate JOAQUIN M FUSTER Department of Psychiatry, School of Medicine, University of California at Los Angeles, Los Angeles, CA, USA Memory is viewed as hierarchical and distributed in primary and association areas of cerebral cortex. Different memory neural networks are interconnected at various levels in this hierarchy, sharing neurons and connections. All memory is essentially associative in its generation, structure and retrieval. External and internal stimuli, to which we attend by virtue of their biological relevance or for other reason, can at any time activate ("turn on ") the neuronal network to which they belong by previous association. This is the basis of knowledge and remembering. The reverberation in recurrent circuits may keep the network in an active state, that is, serving behavior, attention and consciousness. Monkey neuropsychological and electrophysiological data, and human tomographic (brain metabolism) evidence are presented supporting these concepts. Key terms: association cortex, associative memory, prefrontal cortex. INTRODUCTION GENERAL PRINCIPLES In the first place, I will try to present an I will start by stating some general principles overall vision of the role of the cerebral of memory that derive from neuropsycho­ cortex in memory, a vision which, although logical and neurophysiological work in the somewhat personal and perhaps too am­ last years. Some of these principles are still bitious, harmonizes with the evidence that in an embryonic stage, reason for which we through many years we have been accu­ cannot blindly accept them. However, for the mulating in my laboratory. In second place, I sake of brevity, they can be accepted at least will try to suggest a working plan, an agenda as working hypotheses and as premises for for future research, a guide to shed some the experiments that I shall try to summarize light on the still obscure but fascinating and below: complex subject of memory.
    [Show full text]
  • Vibrissae-Evoked Behavior and Conditioning Before Functional Ontogeny of the Somatosensory Vibrissae Cortex
    The Journal of Neuroscience, June 15, 1999, 19(12):5131–5137 Vibrissae-Evoked Behavior and Conditioning before Functional Ontogeny of the Somatosensory Vibrissae Cortex Margo S. Landers and Regina M. Sullivan Department of Zoology, University of Oklahoma, Norman, Oklahoma 73019 The following experiments determined that the somatosensory ulation than controls. Finally, stimulus-evoked somatosensory whisker system is functional and capable of experience- cortical activity during testing [P8; using 14C 2-deoxyglucose dependent behavioral plasticity in the neonate before functional (2-DG) autoradiography] was assessed after somatosensory maturation of the somatosensory whisker cortex. First, unilat- conditioning from P1–P8. No learning-associated differences in eral whisker stimulation caused increased behavioral activity in stimulus-evoked cortical activity were detected between learn- both postnatal day (P) 3–4 and P8 pups, whereas stimulation- ing and nonlearning control groups. Together, these experi- evoked cortical activity (14C 2-deoxyglucose autoradiography) ments demonstrate that the whisker system is functional in was detectable only in P8 pups. Second, neonatal rat pups are neonates and capable of experience-dependent behavioral capable of forming associations between whisker stimulation plasticity. Furthermore, in contrast to adult somatosensory and a reinforcer. A classical conditioning paradigm (P3–P4) classical conditioning, these data suggest that the cortex is not showed that the learning groups (paired whisker stimulation– required for associative somatosensory learning in neonates. shock or paired whisker stimulation–warm air stream) exhibited Key words: vibrissae; whiskers; development; learning; neural significantly higher behavioral responsiveness to whisker stim- plasticity; barrels; somatosensory cortex; behavioral plasticity The rat mystacial vibrissae somatosensory system processes en- Rats are born with whiskers; fine whiskers in follicles appear vironmental tactile cues from the facial whiskers.
    [Show full text]
  • A Review of Theories of Human Amnesia LEONARD D
    Memory & Cognition 1981, Vol. 9 (3),247-262 A review of theories of human amnesia LEONARD D. STERN University ofOregon, Eugene, Oregon 97403 Six theories of human amnesia are examined. Each is categorized according to the processing ability that is conceived to underlie the amnesic deficit. The theories fall into one of four categories: consolidation, retrieval, semantic encoding, and context encoding deficit theories. The recently proposed context encoding deficit theories are found to offer the most satis­ factory account of the human amnesic syndrome. It is suggested that the other theoretical approaches are best viewed as special cases of these context encoding deficit theories. The human amnesic syndrome is characterized by a technique in the treatment of psychosis. This surgical severely impaired memory for day-to-day events procedure, used as an alternative to a complete frontal accompanied by normal intelligence, perceptual abilities, lobotomy, was intended to avoid the side effects that and other cognitive functions. Amnesia is typically the lobotomy normally produced (B. Milner, 1966). associated with brain trauma brought about by blows to After 30 of these operations had been performed, it was the head, surgical removal of portions of the brain, or discovered that a serious memory impairment could degenerative processes that accompany excessive and result. Memory deficits were initially discovered in two prolonged alcohol consumption (Korsakoff's syndrome). of Scoville's patients. One patient had undergone surgery The focus of this paper will be on theoretical accounts to treat a psychosis, and the other, the well-known H.M., of the human amnesic syndrome. The theories of amnesia had undergone surgery to control epileptic seizures.
    [Show full text]
  • A REVIEW on LEARNING and MEMORY Gupta Avneet*, Singh Manish Pal and Sisodia S
    Gupta et al Journal of Drug Delivery & Therapeutics. 2018; 8(2):153-157 Available online on 15.03.2018 at http://jddtonline.info Journal of Drug Delivery and Therapeutics Open Access to Pharmaceutical and Medical Research © 2011-18, publisher and licensee JDDT, This is an Open Access article which permits unrestricted non- commercial use, provided the original work is properly cited Open Access Review Article A REVIEW ON LEARNING AND MEMORY Gupta Avneet*, Singh Manish Pal and Sisodia S. Siddhraj Department of Pharmacology, Bhupal Nobles’ College of Pharmacy, Bhupal Nobles’ University, Udaipur, Rajasthan, India ABSTRACT Learning is defined as the acquisition of information and skills and subsequent retention of the information is called memory. Dementia is one of the ages related mental problems and characteristic symptom of various neurodegenerative disorders including Alzheimer’s disease which is age related. It is a progressive and neurodegenerative disorder. The analysis of the anatomical and physical bases of learning and memory is one of the great successes of modern neuroscience. The action of drugs on memory is more or less specific and serious depending on the memory system affected. So the present study is therefore focused on the various types of learning and memory. Key Words: Learning, Memory, Dementia. Article Info: Received 09 Jan, 2018; Review Completed 23 Feb, 2018; Accepted 25 Feb, 2018; Available online 15 March, 2018 Cite this article as: Gupta A, Singh MP, Sisodia SS, A review on learning and memory, Journal of Drug Delivery and Therapeutics. 2018; 8(2):153-157 DOI: http://dx.doi.org/10.22270/jddt.v8i2.1671 *Address for Correspondence Avneet Gupta, Research Scholar, Department of Pharmacology, Bhupal Nobles’ College of Pharmacy, Bhupal Nobles’ University, Udaipur, Rajasthan, India.
    [Show full text]
  • Mechanics of Memory – a Review
    INTERNATIONAL JOURNAL FOR INNOVATIVE RESEARCH IN MULTIDISCIPLINARY FIELD ISSN – 2455-0620 Volume - 2, Issue - 9, Sept - 2016 MECHANICS OF MEMORY – A REVIEW Pampori, Z. A. and Malla, W. A Division of Veterinary Physiology, SKUAST-Kashmir, Alusteng, Srinagar, Kashmir, J&K State, India. Email - [email protected] Abstract: The interaction of living organisms between themselves and with the environment is essential for survival. The communication among different living species involves the integrity of central nervous system which generates brain activity such as arousal, attention, learning and memory. Moreover, face perception and recognition of faces are fundamental brain processes for human relationship. The ability to hold objects in memory is essential to intelligent behavior, but its neural basis still remains poorly understood. Advances in neuroscience research for past two decades have contributed to clarify the intricate puzzle about brain recognizing objects. Key words: Biology of memory, Construction of memory, Neurophysiology of memory, Types of memory. INTRODUCTION: Memory provides an organism the competence to learn and adapt from previous experiences as well as build relationships. Memories make you feel comfortable with familiar people and surroundings, tie your past with your present, and provide a framework for the future. Most people talk about memory as if it is a thing or part of a body, like bad eyes or a good head of hair. But it does not exist as a "thing" that you can touch. It is a concept that refers to the process of remembering. The most difficult problem in discussing memory and one of the mysteries of the brain is neural basis of memory.
    [Show full text]
  • Psychology of Learning – an Overview Content
    Training On Teaching Methods In Vocational Education Training for vocational teachers of the PAAET/Kuwait in Munich 2002-09-02 to 2002-09-13 Dr. Alfred Riedl Akademischer Rat * Dipl.-Berufspäd. Univ. PPssyycchhoollooggyy ooff LLeeaarrnniinngg AAnn OOvveerrvviieeww München 2002-09-03 J. Altmann -trainer in cooperation with and Psychology of Learning – An Overview Content Content Content..............................................................................................................................2 Human Information Technology.........................................................................................3 Teaching and Learning......................................................................................................3 The Memory ......................................................................................................................4 How to Improve One´s Memory.........................................................................................6 The Brain...........................................................................................................................7 Brain Requirements for Learning.......................................................................................9 Address: Dr. Alfred Riedl Lehrstuhl für Pädagogik Technische Universität München Lothstrasse 17, 80335 München Tel. + 49 89 289 24355 www.paed.ws.tum.de/riedl/ [email protected] all rights reserved 2 Dr. Alfred Riedl * TU München Psychology of Learning – An Overview Human Information Technology
    [Show full text]
  • Brenda Milner 276
    EDITORIAL ADVISORY COMMITTEE Verne S. Caviness Bernice Grafstein Charles G. Gross Theodore Melnechuk Dale Purves Gordon M. Shepherd Larry W. Swanson (Chairperson) The History of Neuroscience in Autobiography VOLUME 2 Edited by Larry R. Squire ACADEMIC PRESS San Diego London Boston New York Sydney Tokyo Toronto This book is printed on acid-free paper. @ Copyright 91998 by The Society for Neuroscience All Rights Reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Academic Press a division of Harcourt Brace & Company 525 B Street, Suite 1900, San Diego, California 92101-4495, USA http://www.apnet.com Academic Press 24-28 Oval Road, London NW1 7DX, UK http://www.hbuk.co.uk/ap/ Library of Congress Catalog Card Number: 98-87915 International Standard Book Number: 0-12-660302-2 PRINTED IN THE UNITED STATES OF AMERICA 98 99 00 01 02 03 EB 9 8 7 6 5 4 3 2 1 Contents Lloyd M. Beidler 2 Arvid Carlsson 28 Donald R. Griffin 68 Roger Guillemin 94 Ray Guillery 132 Masao Ito 168 Martin G. Larrabee 192 Jerome Lettvin 222 Paul D. MacLean 244 Brenda Milner 276 Karl H. Pribram 306 Eugene Roberts 350 Gunther Stent 396 Brenda Milner BORN: Manchester, England July 15, 1918 EDUCATION: University of Cambridge, B.A. (1939) University of Cambridge, M.A. (1949) McGill University, Ph.D. (1952) University of Cambridge, Sc.D. (1972) APPOINTMENTS" Universit~ de Montreal (1944) McGill University (1952) HONORS AND AWARDS: (SELECTED): Distinguished Scientific Contribution Award, American Psychological Association (1973) Fellow, Royal Society of Canada (1976) Foreign Associate, National Academy of Sciences U.S.A.
    [Show full text]
  • Periodicity and Firing Rate As Candidate Neural Codes for the Frequency of Vibrotactile Stimuli
    The Journal of Neuroscience, July 15, 2000, 20(14):5503–5515 Periodicity and Firing Rate As Candidate Neural Codes for the Frequency of Vibrotactile Stimuli Emilio Salinas, Adria´ n Herna´ ndez, Antonio Zainos, and Ranulfo Romo Instituto de Fisiologı´a Celular, Universidad Nacional Auto´nomadeMe´ xico, 04510, Me´ xico D.F., Me´ xico The flutter sensation is felt when mechanical vibrations between crimination. We found that periodicity was extremely high in S1 5 and 50 Hz are applied to the skin. Neurons with rapidly adapt- but almost absent in S2. We also found that periodicity was ing properties in the somatosensory system of primates are enhanced when the stimuli were relevant for behavior. However, driven very effectively by periodic flutter stimuli; their evoked periodicity did not covary with psychophysical performance in spike trains typically have a periodic structure with highly regular single trials. On the other hand, rate modulations were similar in time differences between spikes. A long-standing conjecture is both areas, and with periodic and aperiodic stimuli, they were that, such periodic structure may underlie a subject’s capacity to enhanced when stimuli were important for behavior, and were discriminate the frequencies of periodic vibrotactile stimuli and significantly correlated with psychophysical performance in sin- that, in primary somatosensory areas, stimulus frequency is en- gle trials. Thus, the exquisitely timed, stimulus-driven spikes of coded by the regular time intervals between evoked spikes, not primary somatosensory neurons may or may not contribute to by the mean rate at which these are fired. We examined this the neural code for flutter frequency, but firing rate seems to be hypothesis by analyzing extracellular recordings from primary an important component of it.
    [Show full text]