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The aim of th ｛ s study was to investigate the psychophysiologica 且 processing during putting ． Eight athletes were recruited as subjects from a university golf club and given lOO trials of putting a ball to a hole， which was placed 200 cm away from the ballposition ． EEG was recorded during the performance from Cz site with 5． O sec time constant ． Trials were divided into two categ6ries according to the alternative judgements that were made immediately after each putt ； one was a feeling of su ess of putting and the other was a fee且 ing of fai 且 ure ． The averaged readiness − pt 〕 tential for the feelingof − failure tria苴 s was larger than that for the f 踊ng く) f ・ success trails ． However ， the estimated readiness potential component for the fee 且 ing ・ of − failure trials ， which was obtained by the principal component ana 蒹 ysis， was not 里 arger than that for the feeling − of ・ success traials ． Moreover， for the feeling − of − failure trials ， two estimated readiness P 。t。 nti・1s a ・d m ・t・r p・t・ nti ・ 1・ were ・bt・i ・ ed ． ・These ・ es ・ lts s 9・・t ・ th・t tw ・ P ・ y ・h・1 ・ 卿 1 P ， esses c ・・ t・ib ・ t・ th・ ・ubjecti ・・ feeli ・ g ・f f・il ・ ・e i・ P ・ tti ・ g whi1 ・ ・nly ・ne p ・ y ・ h・且 ・ gical process is involved in the feeling of success in putting ・ Key words ： golf， putting ， readiness pote 皿 tial σ

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