Verbal working memory may combine phonological and conceptual units. We disentangle their contributions by extending a prior procedure (Chen & Cowan, 2005) in which items recalled from lists of previously seen word singletons and of previously learned word pairs depended on the list length in chunks. Here we show that a constant capacity of about 3 chunks holds across list lengths and list types, provided that covert phonological rehearsal is prevented. What remains is a core verbal working-memory capacity.
BaddeleyA. (1986). Oxford psychology series, No. 11: Working memory. New York: Clarendon Press/Oxford University Press.
2.
BaddeleyA. (2000). The episodic buffer: A new component of working memory?.Trends in Cognitive Sciences4, 417–423.
3.
BaddeleyA. (2001). The magic number and the episodic buffer.Behavioral and Brain Sciences24, 117–118.
4.
BaddeleyA. D.HitchG. J. (1974). Working memory.The psychology of learning and motivation: Advances in research and theory. BowerG. A.New York: Academic Press8, 47–89.
5.
BaddeleyA. D.LewisV.VallarG. (1984). Exploring the articulatory loop.Quarterly Journal of Experimental Psychology: Human Experimental Psychology36A, 233–252.
6.
BroadbentD. E. (1975). The magic number seven after fifteen years.Studies in long-term memory. KennedyA.WilkesA.New York: Wiley3–18.
7.
ChenZ.CowanN. (2005). Chunk limits and length limits in immediate recall: A reconciliation.Journal of Experimental Psychology: Learning, Memory, and Cognition31, 1235–1249.
8.
CowanN. (1988). Evolving conceptions of memory storage, selective attention, and their mutual constraints within the human information-processing system.Psychological Bulletin104, 163–191.
9.
CowanN. (1999). The differential maturation of two processing rates related to digit span.Journal of Experimental Child Psychology72, 193–209.
10.
CowanN. (2001). The magical number 4 in short-term memory: A reconsideration of mental storage capacity.Behavioral and Brain Sciences24, 87–185.
11.
CowanN.ChenZ.RouderJ. N. (1956). Constant capacity in an immediate serial-recall task: A logical sequel to Miller.Psychological Science15, 634–640.
12.
CraikF. I.TulvingE. (1975). Depth of processing and the retention of words in episodic memory.Journal of Experimental Psychology: General104, 268–294.
13.
GlanzerM.RazelM. (1974). The size of the unit in short-term storage.Journal of Verbal Learning & Verbal Behavior13, 114–131.
14.
GobetF.ClarksonG. (2004). Chunks in expert memory: Evidence for the magical number four…or is it two?.Memory12, 732–747.
15.
HulmeC.RoodenrysS.SchweickertR.BrownG. D. A.MartinS.StuartG. (1997). Word-frequency effects on short-term memory tasks: Evidence for a redintegration process in immediate serial recall.Journal of Experimental Psychology: Learning, Memory, and Cognition23, 1217–1232.
16.
LevyB. A. (1971). Role of articulation in auditory and visual short-term memory.Journal of Verbal Learning & Verbal Behavior10, 123–132.
17.
MillerG. A. (1956). The magical number seven, plus or minus two: Some limits on our capacity for processing information.Psychological Review63, 81–97.
18.
MurrayD. (1968). Articulation and acoustic confusability in short-term memory.Journal of Experimental Psychology78, 679–684.
19.
OberauerK. (2002). Access to information in working memory: Exploring the focus of attention.Journal of Experimental Psychology: Learning, Memory, and Cognition28, 411–421.
20.
PetersonL. R.JohnsonS. T. (1971). Some effects of minimizing articulation on short-term retention.Journal of Verbal Learning & Verbal Behavior10, 346–354.