Search results for: Shogo Sakata

Items from 1 to 20 out of 23 results

article

Behavioral inhibition during a conflict state elicits a transient decline in hippocampal theta power

Yuya Sakimoto, Shogo Sakata

Behavioural Brain Research > 2015 > 290 > Complete > 70-76

Although it has been shown that hippocampal theta power transiently declines during response inhibition in a simultaneous feature negative (FN: A+, AB−) task, observations of additional changes after this initial decline have been inconsistent across subjects. We hypothesized that the cause of these inconsistencies might be that variations in the learning speed for the FN task differentially affect...

article

Change in hippocampal theta activity during behavioral inhibition for a stimulus having an overlapping element

Yuya Sakimoto, Shogo Sakata

Behavioural Brain Research > 2015 > 282 > Complete > 111-116

It is believed that a decline in hippocampal theta power is induced by response inhibition for a conflict stimulus having an overlapping element. This study used a simultaneous feature positive (simul FP: A−, AX+) task and a serial FP (A−, X→A+) task. In these tasks, the compound and single stimuli have an overlapping element, and rats are required to exhibit response inhibition for the single stimulus...

article

A model of multisecond timing behaviour under peak-interval procedures

Takayuki Hasegawa, Shogo Sakata

Journal of Computational Neuroscience > 2015 > 38 > 2 > 301-313

In this study, the authors developed a fundamental theory of interval timing behaviour, inspired by the learning-to-time (LeT) model and the scalar expectancy theory (SET) model, and based on quantitative analyses of such timing behaviour. Our experiments used the peak-interval procedure with rats. The proposed model of timing behaviour comprises clocks , a regulator ...

article

Hippocampal theta activity during behavioral inhibition for conflicting stimuli

Yuya Sakimoto, Shogo Sakata

Behavioural Brain Research > 2014 > 275 > Complete > 183-190

A recent behavioral inhibitory theory proposed that the hippocampus plays an important role in response inhibition to conflicting stimuli composed of simple inhibitory associations between events embedded in concurrent simple excitatory associations. In addition, the theory states that a serial feature negative (FN) task is a hippocampal-dependent task requiring the formation of a simple inhibitory...

article

Brain electrophysiological activity correlates with temporal processing in rats

Minoru Hattori, Shogo Sakata

Behavioural Processes > 2014 > 101 > Complete > 97-102

In this study, we present electroencephalographic (EEG) recording data obtained in correlation with timing behavior in rats trained in a 30-s peak interval (PI) procedure. The distribution of lever press responses was found to be Gaussian, peaking at approximately 30s: lever pressing behavior increased for 30s then decreased after the reinforcement time. We recorded EEG activity in the hippocampus...

article

The decline in rat hippocampal theta activity during response inhibition for the compound stimulus of negative patterning and simultaneous feature-negative tasks

Yuya Sakimoto, Shogo Sakata

Behavioural Brain Research > 2013 > 257 > Complete > 111-117

In experiment 1 of this study, we compared hippocampal theta activity between negative patterning and simple discrimination tasks. Our results demonstrated a transient decline in theta activity during response inhibition for a compound stimulus in the negative patterning task. In experiment 2 of this study, we compared hippocampal theta activity among simultaneous feature-negative, compound stimulus...

article

Transient decline in rats’ hippocampal theta power relates to inhibitory stimulus-reward association

Yuya Sakimoto, Kozue Takeda, Kana Okada, Minoru Hattori, more

Behavioural Brain Research > 2013 > 246 > Complete > 132-138

The hippocampus is important in learning during a discrimination-reversal task. In this task, animals first learn to emit the go response to one stimulus and the no-go response to another stimulus (S1+, S2−) during the discrimination phase, and then they learn to reverse these relationships between stimulus and response during the reversal phase (S1−, S2+). To emit a no-go response for non-reinforced...

article

Neural activity in the hippocampus during conflict resolution

Yuya Sakimoto, Kana Okada, Minoru Hattori, Kozue Takeda, more

Behavioural Brain Research > 2013 > 237 > Complete > 1-6

This study examined configural association theory and conflict resolution models in relation to hippocampal neural activity during positive patterning tasks. According to configural association theory, the hippocampus is important for responses to compound stimuli in positive patterning tasks. In contrast, according to the conflict resolution model, the hippocampus is important for responses to single...

article

Hippocampal theta wave activity during configural and non-configural tasks in rats

Yuya Sakimoto, Minoru Hattori, Kozue Takeda, Kana Okada, more

Experimental Brain Research > 2013 > 225 > 2 > 177-185

This study examined hippocampal theta power during configural and non-configural tasks in rats. Experiment 1 compared hippocampal theta power during a negative patterning task (A+, B+, AB−) to a configural task and a simple discrimination task (A+, B−) as a non-configural task. The results showed that hippocampal theta power during the non-reinforcement trial (non-RFT) of the negative patterning task...

article

Evaluation of neurotoxicity of trimethyltin in rat brain under various housing conditions

Tsutomu Ooyama, Takao Mukuda, Takeshi Yamazaki, Atsuhiko Ishida, more

Neuroscience Research > 2011 > 71 > Supplement > e340

article

Environmental enrichment alters gene expression of steroidogenic enzymes in the rat hippocampus

Eiji Munetsuna, Minoru Hattori, Yuya Sakimoto, Atsuhiko Ishida, more

General and Comparative Endocrinology > 2011 > 171 > 1 > 28-32

Neuroactive steroids are synthesized in the central and peripheral nervous systems. The purpose of this study was to analyze the effects of environmental enrichment on neuroactive steroidogenesis in the rat hippocampus. Environmental enrichment rats were housed in a group of nine in a large cage and three groups of pair-housed rats were housed in a standard cage for 8weeks. The levels of mRNAs for...

article

Identification of rat P3-like processes in the anterior cingulate cortex and hippocampus

Minoru Hattori, Keiichi Onoda, Shogo Sakata

Neuroscience Letters > 2010 > 472 > 1 > 43-46

The purpose of this study was to investigate whether the rat P3-like potential reflects “attention processes” rather than “arousal level”. After controlling for arousal levels, event-related potentials (ERPs) of the rat were recorded at the anterior cingulate cortex and hippocampal CA1 during active and passive oddball paradigms. The arousal level of the passive group was equivalent to that of the...

article

Effect of housing conditions on neurotoxicity of trimethyltin in rat brain

Tsutomu Ooyama, Yuya Sakimoto, Masahiro Onizaki, Yuka Koyama, more

Neuroscience Research > 2010 > 68 > Supplement 1 > e258

article

Social isolation stimulates hippocampal estradiol synthesis

Eiji Munetsuna, Minoru Hattori, Shota Komatsu, Yuya Sakimoto, more

Biochemical and Biophysical Research Communications > 2009 > 379 > 2 > 480-484

17β-Estradiol is synthesized de novo in the rat hippocampus. However, the regulatory mechanism of hippocampal estradiol synthesis has remained unclear. We investigated the effects of social isolation on rat hippocampal estradiol synthesis. Rats were divided into two groups: social isolation and pair housed group. Socially isolated rats were housed individually while pair housed rats were housed two...

article

Neuroprotective effect of estradiol on methylmercury-induced neuronal cell toxicity in rat hippocampal slices

Takeshi Yamazaki, Shota Komatsu, Masahiro Onizaki, Takao Mukuda, more

Neuroscience Research > 2009 > 65 > Supplement 1 > S220

article

Diurnal expression of neurosteroidogenic enzymes mRNA in the rat hippocampus

Minoru Hattori, Eiji Munetsuna, Kento Takahashi, Kazunori Takekawa, more

Neuroscience Research > 2009 > 65 > Supplement 1 > S221

article

Study of nicotine dose effects on temporal discrimination in rats

Shogo Sakata, Minoru Hattori

Neuroscience Research > 2007 > 58 > Supplement 1 > S227

article

An ERP study of temporal discrimination in rats

Keiichi Onoda, Shogo Sakata

Behavioural Processes > 2006 > 71 > 2-3 > 235-240

In this study, we examined event-related potentials (ERPs) in rats performing a timing task. The ERPs were recorded during a timing task and a control task from five regions (frontal cortex, striatum, hippocampus, thalamus, and cerebellum) that are related to time perception. In the timing task, the rats were required to judge the interval between two tones. This interval could be either 500 or 2000ms...

article

LORETA analysis of CNV in time perception

Keiichi Onoda, Jun Suzuki, Hiroshi Nittono, Shogo Sakata, more

International Congress Series > 2004 > 1270 > Complete > 291-294

The aim of this study was to specify when and where ''pure'' temporal processing occurred in the brain. Event-related potentials were recorded from 13 young, healthy volunteers performing interval and pitch discrimination tasks. In the interval task, two 1000-Hz tones (S1 and S2) were presented with an interval of 1000 or 1500 ms. Participants were asked to judge whether the S1-S2 interval was short...

article

Event-related potentials in the frontal cortex, hippocampus, and cerebellum during a temporal discrimination task in rats

Keiichi Onoda, Erika Takahashi, Shogo Sakata

Cognitive Brain Research > 2003 > 17 > 2 > 380-387

The purpose of this study was to evaluate the roles of the frontal cortex, hippocampus, and cerebellum in timing and time perception using event-related potentials (ERPs) in rats. Rats were trained to discriminate between 2-s and 8-s auditory signal durations using a choice procedure. A simple reaction-time task using only the 2-s signal served as the control condition. In both tasks, ERPs were computed...

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Search results for: Shogo Sakata

Behavioral inhibition during a conflict state elicits a transient decline in hippocampal theta power

Change in hippocampal theta activity during behavioral inhibition for a stimulus having an overlapping element

A model of multisecond timing behaviour under peak-interval procedures

Hippocampal theta activity during behavioral inhibition for conflicting stimuli

Brain electrophysiological activity correlates with temporal processing in rats

The decline in rat hippocampal theta activity during response inhibition for the compound stimulus of negative patterning and simultaneous feature-negative tasks

Transient decline in rats’ hippocampal theta power relates to inhibitory stimulus-reward association

Neural activity in the hippocampus during conflict resolution

Hippocampal theta wave activity during configural and non-configural tasks in rats

Evaluation of neurotoxicity of trimethyltin in rat brain under various housing conditions

Environmental enrichment alters gene expression of steroidogenic enzymes in the rat hippocampus

Identification of rat P3-like processes in the anterior cingulate cortex and hippocampus

Effect of housing conditions on neurotoxicity of trimethyltin in rat brain

Social isolation stimulates hippocampal estradiol synthesis

Neuroprotective effect of estradiol on methylmercury-induced neuronal cell toxicity in rat hippocampal slices

Diurnal expression of neurosteroidogenic enzymes mRNA in the rat hippocampus

Study of nicotine dose effects on temporal discrimination in rats

An ERP study of temporal discrimination in rats

LORETA analysis of CNV in time perception

Event-related potentials in the frontal cortex, hippocampus, and cerebellum during a temporal discrimination task in rats

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